When a less active ingredient in a molecule can be changed with a more reactive element, we forecast that just one reaction will take place. Ca + MgCl₂ → CaCl₂ + Mg will be the chemical equation for a fair system.
What are equations in science?An illustration of a chemical that is often expressed as a linear array with an arrow or a group of arrows separating the symbols and amounts of the reactants and those of the products.
The given equation is Ca + MgCl₂ →
It is well known that when calcium (Ca) reacts with magnesium chloride (MgCl₂), calcium chloride (CaCl₂) and magnesium are produced.
Ca + MgCl₂ → CaCl₂ + Mg.
Calcium only has atom on the photocatalyst surface and one on the product side, as can be seen. Chlorine, from the other hand, has one atom on both the reactant and product sides.
As a result, the response will be balanced.
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In water, bases form a. hydroxide ions. b. hydrogen ions. c. hydrogen gas. d. oxide ions.
In the water, the bases forms the hydroxide ions. the bases are the substances which when dissolves in the water produces the hydroxide ions.
The bases are the substance which when dissolves in the water donates the hydroxide ions that is OH⁻ ions. In the pH scale the range above the 7 is called as the bases. The acids are the substance which when dissolves in the water produces the hydrogen ions that is H⁺ ions. The pH scale range of the acid are below 7. The pH 7 is for the neutral substances.
Thus, the bases dissociates in to the hydroxide ions when dissolves in to the water.
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The bases in water create hydroxide ions. The substances known as bases are what dissolve in water to produce hydroxide ions.
The bases are the substance that donates hydroxide ions, or OH- ions, when it dissolves in water. The pH scale's range above 7 is referred to as the bases range. The hydrogen ions, also known as H* ions, are created when the acids dissolve in water. The acid's pH scale range is below 7. The pH 7 is for substances that are neutral.
As a result, when the bases dissolve in water, they split apart into hydroxide ions
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The tragic death of Michael Jackson occurred in June of 2009. The following statements were taken from his autopsy report
as the manner, cause & mechanism of death. Which is the cause of death?
I acute propafol intoxication
Il homicide
III respiratory arrest
AI
4x B 11
4x C
4x D
none of these
Answer:
acute propafol intoxication
Explanation:
acute propafol intoxication
Arrange the rocks from oldest to youngest, and put a description of the rocks in the box. Follow the instructions that are shown in the images down below.
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, in below given ways we can arrange the rocks from oldest to youngest.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
The law of deposition states that the freshest layers are at the surface and the longest are at the bottom. Throughout the canyon, distinct rock strata, for example the Coconino Limestone, are matched. According to the law of lateral continuity, these rock strata were originally united.
Therefore, in above way we can arrange the rocks from oldest to youngest.
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Give the IUPAC name for the following compound ch3(ch2)3ch(ch2ch2ch3)ch(ch3)2
The IUPAC name for the following compound ch3(ch2)3ch(ch2ch2ch3)ch(ch3)2 is 4-isoproyloctane.
What is IUPAC ?
The International Union of Pure and Applied Chemistry (IUPAC) is the foremost expert on chemical vocabulary, nomenclature (including the naming of new elements in the periodic table), standardized measuring techniques, atomic weights, and many other critically analysed data.
What is compound ?
A compound in chemistry is a material that is created when two or more separate chemical elements are mixed in a specific order. The interaction of the elements creates chemical connections that are challenging to break. Shared or exchanged electrons between atoms cause the formation of these bonds.
The longest chain consists of eight carbon atoms, which means the root name of the compound is octane, and one isopropyl group is attached at the fourth position. Therefore, its IUPAC name is 4-isopropyloctane.
The naming of the compound is done on the basis of the rules of IUPAC nomenclature. There is only one isopropyl substituent present in the carbon chain at the fourth position, therefore, its IUPAC name is 4-isopropyloctane.
The concept used to solve this question is IUPAC nomenclature.
The name of the compound is determined by IUPAC nomenclature. IUPAC stands for international union of pure and applied chemistry. IUPAC has given a nomenclature to name organic compounds. The IUPAC name consists of three parts: root name, prefix, and suffix.
The three parts of an IUPAC name are root name, prefix, and suffix. The longest chain tells the root name. Prefix tells the position and name of the substitutions present on the longest chain. Suffix tells the functional group present in the structure.
The IUPAC nomenclature rules are as follows:
1) First, determine the longest carbon chain containing the functional group. In the case of alkene or alkyne, the double or triple bond must have the lowest possible number.
2) The parent name of the carbon chain is derived from the respective hydrocarbon, and the suffix ‘-ene’ is added for an alkene functional group and the suffix ‘-yne’ is added for an alkyne functional group
3) If there are different substituents, then their names are prefixed in the alphabetical order before the parent name.
Therefore, the IUPAC name for the following compound ch3(ch2)3ch(ch2ch2ch3)ch(ch3)2 is 4-isoproyloctane.
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The IUPAC name of the compound ch3(ch2)3ch(ch2ch2ch3)ch(ch3)2 is 4-isoproyloctane.
What is IUPAC nomenclature?
The name of the compound is determined by IUPAC nomenclature. International Union of Pure and Applied Chemistry is referred to as IUPAC. IUPAC has given a nomenclature to name organic compounds. The root name, prefix, and suffix are the three components of an IUPAC name. The longest chain tells the root name. The longest chain's prefix identifies the location and name of any substitutions. The suffix identifies the structural functional group.
The naming of the compound is done on the basis of the rules of IUPAC nomenclature. There is only one isopropyl substituent present in the carbon chain at the fourth position. The longest chain consists of eight carbon atoms, which means the root name of the compound is octane, and one isopropyl group is attached at the fourth position. Therefore, its IUPAC name is 4-isopropyloctane.
Hence, 4-isoproyloctane is the IUPAC name of the compound ch3(ch2)3ch(ch2ch2ch3)ch(ch3)2.
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An impact crater forms when a meteor hits the earth’s surface with enough mass and velocity. A maar is a volcanic crater that forms when magma interacts with groundwater and causes a small explosion. Which statement about impact craters and maars is correct?
A) Both impact craters and maars form over short periods of time.
B) Impact craters form over short periods of time, and maars form over long periods of time.
C) Both impact craters and maars form over long periods of time.
D) Impact craters form over long periods of time, and maars form over short periods of time.
The statement that is correct about impact craters and maars is that impact craters form over short periods of time, and maars form over long periods of time. So the correct option is B.
What are impact crater and maars?Maars are those volcanic craters that will form when the magma touches the water that will be in the underground area, producing an explosion formed by steam. It can be formed by one or more volcanic explosions that will release steam, water, ash, and magmatic material.
As for the impact crater, it is a depression that will be left on the surface of the planet given by the collapse of a planetary body. They're going to have raised edges and their floor will be lower, because it's going to be caused by this collapse instead of an internal explosion.
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Draw the dipeptide alanylvaline. Consult the table of amino acids for amino acid structures. Inclu
Dipeptide alanylvaline is an amino compound with peptide-peptide bond. It has the structure below.
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Why does ninhydrin stain the skin blue? a. Skin contains amino acids. b. Ninhydrin is blue-colored c. Ninhydrin turns blue when warmed
Option A, Ninhydrin is a chemical that is used to detect the presence of amino acids in a sample. It reacts with the amino acids in a sample, such as skin, to form a complex that is blue in color.
Ninhydrin is a chemical that is used to detect the presence of amino acids in a sample. It reacts with the amino acids in a sample, such as skin, to form a complex that is blue in color. This is because when Ninhydrin reacts with an amino acid it forms a complex with the nitrogen in the amino group, and this complex is blue in color. It is also commonly used in forensic science to detect fingerprints, as fingerprints contain amino acids from the oils and sweat on the skin. The blue coloration of the skin is an indication of the presence of amino acids, which are found in many biological molecules such as proteins and enzymes.
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How does the electron-cloud model describe electrons?
Electron-cloud model shows a many electrons system where the nucleus is surrounded by a cloud of electrons.
What is the electron-cloud model?It shows a many electrons structure where the nucleus is nearby a cloud of electrons. He based it on Heisenberg's variability principle and quantum mechanics. It explains that there the electron has no required location however we can only give the around where the electron cloud would be most likely found.
The electron cloud has both kinetic energy and momentum, yet there is no motion. The cloud is superbly static. The electron does not "orbit" the proton at all – it surrounds it like a fog.
So we can conclude that an electron cloud is an area all over the nucleus of an atom where electrons are most likely to be found.
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A 10.00-mL sample of vinegar, an aqueous solution of acetic acid (HC2H3O2), is titrated with 0.5056 M NaOH, and 16.63 mL is required to reach the endpoint. (a) What is the molarity of the acetic acid
The molarity of the acetic acid is 0.8319 M.
The molarity of acetic acid in a 10.00-mL sample of vinegar can be determined by titrating the sample with 0.5056 M [tex]NaOH[/tex]. It took 16.63 mL of the [tex]NaOH[/tex] solution to reach the endpoint. To calculate the molarity of the acetic acid, the following equation can be used:
Molarity ([tex]HC_{2}H_{3}O_{2}[/tex]) = (Vol. x Molarity [tex]NaOH[/tex]) / Vol. [tex]HC_{2}H_{3}O_{2}[/tex]
Therefore, Molarity ([tex]HC_{2}H_{3}O_{2}[/tex]) = (16.63[tex]ml[/tex] x 0.5056 [tex]M[/tex]) / 10.00[tex]ml[/tex]
Molarity ([tex]HC_{2} H_{3} O_{2}[/tex]) = 0.8319M
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Which three Lewis electron dot structures, are correctly drawn for the compound or ion shown? Check the box in front of the chemical formula for each correctly drawn structure. Recall: ionic compounds do not have covalent bonds.
NF3 NaF ClO-1 PO2-1 SiHF3
Please just write out the Lewis Dot Structure for each and I will compare with the pictures that I am given.
Shared pairs of electrons are drawn as lines between atoms, while lone pairs of electrons are drawn as dots next to atoms.
Which three Lewis electron dot structures, are correct?
Determine the total number of valence electrons in the molecule or ion. ...Arrange the atoms to show specific connections. ...Place a bonding pair of electrons between each pair of adjacent atoms to give a single bond.Lewis dot diagrams show the atoms in a molecule, be it a neutral compound or a charged ion. They also show the number, position and arrangement of the atoms' valence electrons, whilst assuming that all inner electron shells are complete. Specifically, they show any bonded pairs or lone pairs of electrons.For example, the Lewis symbol of carbon depicts a “C' surrounded by 4 valence electrons because carbon has an electron configuration of 1s22s22p2. The Lewis symbol for carbon: Each of the four valence electrons is represented as a dot.The number of dots equals the number of valence electrons in the atom. These dots are arranged to the right and left and above and below the symbol, with no more than two dots on a side. (It does not matter what order the positions are used.)To learn more about chemical formula refers to:
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The conjugate base of CH3NH3+ is A) CH3NH2+ B) CH3NH2-C) CH3NH+ D) CH3NH2
This base is weak; it is methylamine. Methylamine, CH3NH2, and ammonia, NH3, are chemically quite similar.
What is CH3NH2 conjugate acid?Because it may give up an electron pair, CH3NH2 C H 3 N H 2 is a base. It transforms into its conjugate acid when it gives up an electron and accepts a proton. The conjugate acid of CH3NH2 C H 3 N H 2 is CH3NH+3 C H 3 N H 3 + because it contains an additional hydrogen atom and an additional positive charge compared to its base. This makes CH3NH3+ a weak acid.
Because of CH3NH3+, a Bronsted acid, the salt is hence acidic. Moreover, the CH3NH3+ ion's name must be methyl ammonium ion. It belongs to the family of methylamines and is a primary aliphatic amine with one carbon. It is a base of methylammonium conjugated. The aqueous solution of methylamine appears as a colorless to yellow gas.
Therefore the correct answer is option D ) CH3NH2
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Explain why SbCl5 is nonpolar, but SbCl3 is polar
SbCl5 is non polar in nature due to resultant dipole is zero. But SbCl3 is polar because the resultant dipole moment is finite.
Why SbCl5 is a nonpolar molecule?Since there will be no net vector summation of bond moments, SbCl5 is a non-polar molecule. The four C-Cl dipoles of the molecule CCl4 cancel each other out due to its tetrahedral form, making it a nonpolar molecule. The PCl3 molecule has a trigonal pyramidal form due to its tetrahedral electron geometry, which consists of three linked atoms and one lone pair of electrons. A polar molecule is HCl. This occurs because the more electronegative Chlorine (Cl) atom in the HCl molecule does not equally share the bonding electrons with the hydrogen atom (H). However, H2 and Cl2 are non-polar because both atoms in the molecule H2 and Cl2 have similar electronegativity.To learn more about nonpolar molecule refer to:
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IF4+ shape octahedral seesaw square pyramidal tetrahedral trigonal pyramidal hybridization ideal bond angle(s) 60degree 90 degree 109.5 degree 120 degree deviation from ideal angle(s) 60 degree 90 degree 109.5 degree 120 degree none AsCl4- shape octahedral seesaw square pyramidal tetrahedral trigonal pyramidal hybridization ideal bond ar 60 degree 90 degree 109.5 degree 120 degree deviation from ideal angle(s) < 60 degree < 90 degree < 109.5 degree < 120 degree none
IF4+ is an ion with a tetrahedral shape and a hybridization of sp3. The ideal bond angle is 109.5 degrees and there is no deviation from this ideal angle. AsCl4- is an ion with an octahedral shape and a hybridization of sp3d2. The ideal bond angles are 90 degrees and there is deviation from this ideal angle, with angles less than 90 degrees.
The shape of a molecule is determined by the arrangement of its atoms in space and the number of electron pairs around the central atom. The hybridization of a molecule refers to the mixing of atomic orbitals to form new hybrid orbitals that are used for bonding. The bond angles in a molecule are determined by the repulsion between electron pairs, with ideal angles being based on the arrangement of the electron pairs. In the case of IF4+ and AsCl4-, the deviation from the ideal angles is a result of the presence of lone pairs of electrons, which change the angles due to their repulsion with bonding electrons.
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What are the steps for making a distance time graph
Answer:
Decide on the size of the axes.
The -axis represents the time taken.
The -axis represents the distance travelled.
Draw each part of the journey in sections.
For each stage of the journey, plot the distance travelled against the time taken and draw the line segment.
Remember that any stop during the journey will be a horizontal line segment.
A return journey means the line segment is drawn going back towards the -axis.
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Which subshell letter corresponds to a 4-leaf clover orbital pattern? O A.d O B.p O C.s O D. F O E. not enough information
d subshell letter corresponds to a 4-leaf clover orbital pattern.
d subshell is more complex than s subshell and p subshell. s subshell has only one orbital, meaning it can contain only 2 electrons. It is sphere shaped. p subshell has three orbitals, meaning it can contain 2x3 = 6 electrons. It is dum-bell shaped. Whereas, d subshell has 5 orbitals, meaning that it can contain 2x5 = 10 electrons. It is double dum-bell shaped, which can otherwise, be also called clover leaf shaped. The positioning of the orbitals depends upon the axis of approach, depending on which there can be the following types of orbitals : dx-y , dy-z , dz-x and dz2. Out of these, dx-y , dy-z, dz-x and dx2-y2 are clearly clover shaped. Each orbital can accommodate 2 electrons. Therefore, these 5 orbitals of d subshell can accommodate total 10 electrons.
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What is the volume of 0.58 moles
of H2 gas at STP?
The volume of 0.58 moles of H2 gas at STP is 14.13 liters.
The volume of a gas is directly proportional to the number of moles of the gas present, if the temperature and pressure are held constant.
STP stands for "standard temperature and pressure," which is defined as a temperature of 0 degrees Celsius (273.15 K) and a pressure of 1 atmosphere (101.325 kPa). Under these conditions, the volume of one mole of any gas is known as the molar volume and is equal to 24.45 L.
To calculate the volume of 0.58 moles of H2 gas at STP, we can use the equation:
Volume = molar volume x moles
Plugging in the values, we get:
Volume = 24.45 L x 0.58 moles = 14.13 L
So the volume of 0.58 moles of H2 gas at STP is 14.13 liters.
This is a result of the direct proportionality between the moles and the volume at STP.
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Answer:
13
Explanation: correct on acellus
tert.-Butyl alcohol INFRARED SPECTRUM 0.8 0.6 Transmitance 0.4 0.2 3000 1000 2000 Wavenumber (cm-1) n-BUTYL ALCOHOL INFRARED SPECTRUM 0.8. 0.6 Transmitance 0.4 0.24 3000 1000 2000 Wavenumber (cm-1)
Interpretation of the IR spectra of 1-butanol: between 2900 and 1500 cm-1, there are sp3 C-H stretching and CH2 bending modes.
In the spectrum, what is IR?IR spectroscopy, also known as infrared spectroscopy, studies the infrared region of the electromagnetic spectrum, which is light that has a longer wavelength and a lower frequency than visible light. The investigation of molecules' responses to infrared light is called infrared spectroscopy.
How can I locate the infrared spectrum?The typical method for obtaining the IR spectra of solids and liquids is to dissolve the sample in a relatively IR transparent solvent, such as CCl4, and then use straightforward liquid cells. Another option is to use NUJOLTM (a blend of highly pure hydrocarbons) to grind a solid into a fine paste so that the resulting "mull" can be directly analysed.
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Place these hydrocarbons in order of decreasing boiling point. Rank from highest to lowest boiling point. To rank items as equivalent, overlap them.
hexadecane, C16H34
paraffin, C25H52
octane, C8H18
2,2,4-trimethylpentane, C8H18
propane, C2H8
(even using the picture is enough, but looking up boiling points works also)
The hydrocarbons in order of decreasing boiling point are as follows:
Paraffin > Hexadecane > Octane> Hexane > 2,2-dimethylbutane > Propane
The order of strengths of intermolecular forces is: ion-ion > H-bonding > dipole-dipole > London dispersion . Compounds with more potent intermolecular forces have better boiling points. Increased branching decreases the intermolecular dispersion forces among hydrocarbon molecules. As a result, it takes much less energy (and heat) to triumph over those forces, ensuing in a decrease boiling point.
Therefore, for the given hydrocarbons, the order of decreasing boiling point will be: Paraffin > Hexadecane > Octane> Hexane > 2,2-dimethylbutane > Propane
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Which of the following show the formula unit mass of ammonium sulphate (NH42SO? Atomic
mass of N-14, H-1, S-32, 0-16 )
The formula unit mass of ammonium sulphate [(NH₄)₂SO₄] is 132g/mol (option D).
What is formula unit mass?Formula unit mass of a compound signifies the total sum of the atomic masses of all the atoms present in the given compound.
It is calculated by summing the atomic masses of each element that makes up a compound. According to this question, ammonium sulphate with the chemical formula; [(NH₄)₂SO₄] is given.
Since; N = 14, H = 1, S = 32, O = 16, the formula unit mass can be calculated as follows:
{14 + 1(4)}2 + 32 + 16(4)
36 + 32 + 64
= 132g/mol
Therefore, 132g/mol is the formula unit mass of ammonium sulphate.
The options to the incomplete question are as follows;
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An experiment is described below.
A large field at the base of a mountain becomes flooded when heavy rains in the mountains cause a stream to overflow. Each time the flooding occurs, more soil washes away. The owners of the land want to perform an experiment to see if different types of plants could help reduce soil erosion. They choose five areas of ground that are the same size, the same distance from the stream, have the same slope and the same kind of soil, and receive the same amount of sunlight. The type of plant planted in each area is different for each of the five areas. Measurements of soil erosion will be made each time flooding occurs. The results will be compared after six months. Which hypothesis is being tested in this experiment?
The issue of soil erosion can be greatly reduced by plantation. The range of prevention depend on the type of plant also. Hence, the possible hypothesis can be c.
What is a hypothesis?A hypothesis is a scientific statement that make the prediction on a problem based on observations and scientific records.
Soil erosion is the process of depriving soil from the ground through natural calamities such as flood, earth quake, etc. Deforestation is the significant reason of soil erosion
Planting more tress and shrubs greatly helps to reduce the erosion of soil. Their roots adhered to the soil and protect the soil beneath in the ground itself.
The prevention of erosion by plants also depends on the plant type. Because, the roots, and the type of attachment to the soil vary in each type of plant. Hence, option c is correct.
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Your question is missing the options. The most probable options are given below:
a. Soil erosion is affected by the strength of the wind.
b. Flooded areas have greater soil erosion than areas that are not flooded.
c. Some types of plants reduce soil erosion more than others.
d. Some types of soil are more easily eroded.
what periods are lanthanides and actinides in
lanthanides and actinides elements are transition elements found in the 5f block and the (7p and 7d )blocks respectively of the periodic table.
The lanthanides and actinidesThe elements that are commonly known as the lanthanides and actinides are part of the periodic table of elements. The lanthanides are a group of elements that are found in the 5f block of the periodic table. They include the elements cerium (Ce) to lutetium (Lu).
The actinides are a group of elements that are found in the 7p and 7d blocks of the periodic table. They include the elements thorium to lawrencium (Lr).
Lanthanides and actinides elements are transition elements that have similar properties, and share similar electron configurations and are found in similar locations in the periodic table and they are rare earth elements too
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TTACGGAACCT it says what would be the complementary strand in the DNA molecule be for this sequence, how do you know?
I need help
TTACGGAACCT would be the complementary strand in the DNA molecule of AATGCCTTGGA because it depends on the pairs between nucleotides in the double helix.
What is the base pairing rule in the DNA sequence?The base pairing rule in the DNA sequence is indicated by the interaction between Adenine or A with Thymine or T, and Gunaine or G and Cytosine or C in the DNA.
Therefore, with this data, we can see that the base pairing rules in the DNA sequence is dictated by the interaction of the nucleotides in the double helix.
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Condensed structural formulas of glycine and serine Condensed structural formulas of dipeptides Condensed structural formulas of the reactants and products for the hydrolysis of serylglycine Condensed structural formula for the tripeptide
Condensed structural formulas are written in a single line to save space and make them easier and faster to type out. They display the atoms' positions similarly to a structural formula.
What is the Condensed structural formula of glycine and serine ?The only amino acid that has one carbon atom is glycine. [tex]$-\mathrm{COOH}$[/tex] plus one [tex]$-\mathrm{NH}_2$[/tex] group that is connected to an alpha-carbon and contains two hydrogens. - [tex]$\mathrm{COOH}$[/tex] Serine is made up of an a-carbon, one hydrogen, and one [tex]$-\mathrm{NH}_2$[/tex] group as well as one [tex]$-\mathrm{CH}_2 \mathrm{OH}$[/tex]group.
Both glycylserine and serylglycine are dipeptide molecules made up of glycine and serine; however, glycylserine has an amide linkage formed when one H of the [tex]$-\mathrm{NH}_2$[/tex] group of glycine condenses with the - [tex]$\mathrm{OH}$[/tex] of the - [tex]$\mathrm{COOH}$[/tex] group of glycine Comparably, in serylglycine, one -OH of the - [tex]$\mathrm{COOH}$[/tex] group of serine condenses with one H of the [tex]$-\mathrm{NH}_2$[/tex] group of serine. Serine and glycine are the two byproducts of the hydrolysis of serylglycine. The rupture of the amide bond is seen by the red line. The glycine, serine, and alanine amino acids that make up this tripeptide structure are connected by amide bonds.
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One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is by titrating a sample of silver nitrate solution. Any chle anions in solution will combine with the silver cations to produce bright white silver chloride precipitate. Suppose an EPA chemist tests a 200 mL sample of groundwater known to be contaminated with tin(II) chloride, which would react with silver nitrate solut like this: Snc, () + 2 AgNO,(aq) 2 AgCl(s) + Sn (NO), (aq) The chemist adds 37.0 mm silver ritrate solution to the sample until silver chloride stops forming. She then washes, dries, and weighs the precipitate. She fir she has collected 7.1 mg of silver chloride Calculate the concentration of tin(II) chloride contaminant in the original groundwater sample. Round your answer to 2 significant digits.
tin(II) chloride contamination levels in the initial groundwater sample
[tex]$2.4 \times 10^{\wedge}\{-4\}$ \\[/tex][tex]M Fe(II) or $1.3 \times 10^{\wedge}\{-2\} \mathrm{mg} \mathrm{Fe}(\mathrm{II}) / \mathrm{mL}$[/tex]
What is the concentration of ground water ?Titrating a sample of solution is one method the U.S. Environmental Protection Agency (EPA) uses to test for chloride pollutants in water. Silver cations and any chloride anions in solution combine to form a dazzling white precipitate of silver chloride.
If an EPA chemist analyzes a 200 mL sample of groundwater that is known to contain tin(II) chloride, the result would be as follows: Sn (NO) + 2 AgNO, (aq) + 2 AgCl (aq) As soon as silver chloride starts to form, the chemist stops adding 37.0 mm of silver ritrate solution to the sample. After that, she weights the precipitate after washing and drying it. In all, she possesses 7.1 milligrams of silver chloride.
According with the stoichiometry of the reaction:
[tex]$6.9 \mathrm{mgAgCl}\left(\frac{1 \mathrm{mmol} \mathrm{AgCl}}{143.32 \mathrm{mgAgCl}}\right)\left(\frac{1 \mathrm{mmolFeCl}}{1 \mathrm{mmol} \mathrm{AgCl}}\right)\left(\frac{1 \mathrm{mmolFe}}{1 \mathrm{mmolFeCl}}\right)=0.048144 \mathrm{mmolFe}(\mathrm{II})$[/tex]
Now, we divide by the volume of the aliquo
[tex]$\frac{0.048144 \mathrm{mmolFe}(I I)}{200 \mathrm{mLsample}}=2.4 x 10^{-4} \mathrm{MFe}(I I)$[/tex]
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There is an acidic solution in a beaker. What species can be found in the beaker besides water molecule
O both H30* and OH", but [OH-] > [H30+1
O H30+ only
O OH only
O both H30and OH", but [H301> [OH]
The species H30* and OH are also present in the beaker along with the water molecule, making option a correct. In contrast, a beaker of acidic solution raises [OH-] over [H30+1].
To determine acidic solution is, the pH is an important parameter. The pH determines how many hydrogen ions are present in the solution. The pH of 7 distinguishes between neutral and acidic solutions. The pH scale displays basic solutions above 7, and acidic ones below 7. Chemical bonds, also known as attractive forces, hold two or more atoms together to form molecules, which, depending on the context, may or may not also include ions.
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If the atomic mass unit (AMU) is the average mass of all the isotopes of an element; what is the mass number of an element?
Answer:
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The mass number of an element is the sum of the number of protons and neutrons in the nucleus of an atom of that element. It is typically represented by the symbol A. For example, the mass number of carbon-12, which is one of the stable isotopes of carbon, is 12 because it has 6 protons and 6 neutrons in its nucleus. The atomic mass unit (AMU) is a unit of mass that is used to express the masses of atoms and molecules. It is defined as 1/12 the mass of a carbon-12 atom, which is approximately 1.66 x 10^-27 kilograms. Isotopes are atoms of the same element that have the same number of protons in their nuclei but a different number of neutrons. Because they have the same number of protons, they have the same atomic number and are therefore the same element. However, because they have a different number of neutrons, they have a different mass number and therefore a slightly different atomic mass. The atomic mass of an element is usually given as the average mass of all of its isotopes, taking into account their natural abundances.
A sample originally contains 21 grams of a radioactive isotope. After 45 days, 17.3 grams of the isotope remain in the sample. What is the half-life of the isotope
The required half-life of the given radioactive isotope is 157.5 days.
The mass of radioactive isotope =21 g.
After 45 days,
mass of the isotope remain in the sample= 17.3 grams.
The half-life of the element is defined as the time span in which the element grows or decays half of its whole composition of growth and decay.
here,
equation of the radioactive decay is given as,
A = A'αⁿ
Now put
A = 17.3,
A' = 21
n = 45
so by putting the values in the equation we will get the answer as follows
17.3 = 21 α⁴⁵
[17.3/21]1/⁴⁵ = α
Again,
A = A'αⁿ
For half-life Put A = 21 / 2 = 10.5
10.5 = 21 [(17.3/21)¹/⁴⁵]ⁿ
[10.5/21]⁴⁵ = [17.3/21]ⁿ
taking log,
45 log[1/2] = n log[0.82]
45 × 3.5 = n
n = 157.5 days,
Thus, the required half-life of the given radioactive isotope is 157.5 days.
Your question is incomplete most probably your full question was
A sample originally contains 21 grams of a radioactive isotope. After 45 days, 17.3 grams of the isotope remain in the sample.
What is the half-life of the isotope?
Round your answer to the nearest day
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atoms of sulfur have almost exactly double the mass of atoms of oxygen. a compound is 50% sulfur and 50% oxygen by mass. its simplest formula is:
The empirical formula, which may be expressed as SO2 in its simplest form, is S1O2, in accordance with the query.
What is a use for sulfur?Sulfuric acid, that has numerous uses in many industries, is frequently made from sulfur. In instance, lead-acid batteries and fertiliser are made with sulfuric acid. Sulfur is also utilized to make inorganic chemicals, explosives, glass, cement, and matches.
Assume by weight
50g of S and 50g of O
50g/32g/mole = 1.56mole of S
50g/16g/mole = 3.12mole of O
Multiply each molar quantity by 2/3
S is 1 and O is 2
So empirical formula is SO2
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A compound is used to treat iron deficiency in people. it contains 36.76% iron, 21.11% sulfur, and 42.13% oxygen. the empirical formula is fe s o .
The empirical formula of a sample containing 36.76% iron, 21.11% Sulphur, and 42.13% oxygen is FeO₄S.
The empirical formula, which is the ratio of subscripts of the least whole number of the elements present in the formula, is the most straightforward formula for a compound. The molecular formula specifies the precise number of every type of atom that makes up a molecule. It is an empirical formula if it has been simplified.
Iron = 36.76 / 56 = 0.65 / smallest value (0.65) = 1
Oxygen = 42.13/ 16 = 2.633/ 0.65 = 4
Sulphur = 21.11/ 32 = 0.65/0.65 = 1
The empirical formula of FeO₄S contains one iron atom, four oxygen atoms and one Sulphur atom.
Hence, empirical formula is molecular formula with numeric ratios.
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The empirical formula of the given compound that is used to treat iron deficiency in people is [tex]Fe_{1} S_{1} O_{4}[/tex] .
If a percentage is provided, we will assume that the total mass is 100 grammes.
So, the mass of each element is equal to the percentage given.
Mass of Fe 36.76 g =
Mass of S 21.11 g
Mass of O= 42.13 g
Step 1: convert given masses into moles.
Moles of Fe = given mass of Fe/molar mass of Fe
=36.76 g / 56 g/mole
=0.65moles
Moles of S =Given mass of S / molar mass of S
=21.11g/32g/mole
=0.65moles
Moles of O=Given mass of O / molar mass of O
=42.13g / 16g/mole
=2.63 moles
Step 2: Divide each mole value by the lowest calculated mole number to get the mole ratio.
For Fe = 0.65/ 0.65 = 1
For S = 0.65 / 0.65 = 1
For O = 2.63 / 0.65 = 4
The ratio of Fe: S: O=1:1:4
Hence the empirical formula is [tex]Fe_{1} S_{1} O_{4}[/tex]
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what, if any, are the spectator ions when aqueous solutions of hbr and rboh neutralize each other?
The spectator ions oh HBr and RbOH are [tex]Rb^{+} andBr^{-}[/tex].
A chemical solution in which water serves as the solvent is known as an aqueous solution. The dissolved molecules and ions that make up the solutes are encircled by water molecules. An aqueous solution is indicated by appending the letters (aq) to a chemical formula.
Now, Break down all the water components into the appropriate ions to obtain the entire ionic equation.
The complete ionic equation is so
[tex]H^{+} +Br^{-}+Rb^{+}+OH^{-}- > Rb^{+}+Br^{-}+H_{2}O[/tex]
Now, to finally get the ionic equation, now remove the ions which are common from both sides
and then the ions which remain are [tex]Rb^{+} andBr^{-}[/tex].
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