Answer:
As you know, the average atomic mass of an element is determined by taking the weighted average of the atomic masses of its naturally occurring isotopes.
Simply put, an element's naturally occurring isotopes will contribute to the average atomic mass of the element proportionally to their abundance.
avg. atomic mass
=
∑
i
(
isotope
i
×
abundance
x
)
When it comes to the actual calculation, it's easier to use decimal abundances, which are simply percent abundances divided by
100
.
So, you know that copper has two naturally occurring isotopes, copper-63 and copper-65. This means that their respective decimal abundance must add up to give
1
.
If you take
x
to be the decimal abundance of copper-63, you can say that the decimal abundance of copper-65 will be equal to
1
−
x
.
Therefore, you can say that
copper-63
x
⋅
62.9296
u
+
copper-65
(
1
−
x
)
⋅
64.9278
u
=
63.546
u
Solve this equation for
x
to get
62.9296
⋅
x
−
64.9278
⋅
x
=
63.546
−
64.9278
1.9982
⋅
x
=
1.3818
⇒
x
=
1.3818
1.9982
=
0.69152
This means that the percent abundances of the two isotopes will be
69.152
%
→
63
Cu
30.848
%
→
65
Cu
Draw the Lewis dot structure for Al3+, Mg2+, Se2-, N3-
The Lewis dot structure for Al3+, Mg2+, Se2-, N3- are attached.
It has a charge of 3+ because it is missing three electrons from its normal configuration, which makes its outer shell the same as that of neon. As a result, its outer shell is filled, giving it the appearance of having eight dots.
The concept of bond angle cannot be seen in the case of Mg2+ since no bonds are formed with any other atoms. Mg2+ ion hence lacks a bond angle.
Lewis dot structure of azide ion, N 3-, has a total of 3 * 5 + 1 valence electrons, which translates to a total of 16 electrons that can be distributed between its three centers.
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The scientist used _in her experiment. O Nitrogen (capitalized) O nitrogen (not capitalized)
The scientist used Nitrogen (capitalized) in her experiment.
What is Nitrogen?
Nitrogen is a chemical element with symbol N and atomic number 7. It is a colorless, odorless, and tasteless gas that makes up 78% of Earth's atmosphere. It is in gaseous form and also the major constituent of the atmosphere. Nitrogen is an important component of proteins and DNA. Nitrogen is found in all living things, and it is used in the production of proteins, nucleic acids, and other important molecules. It is also used to make fertilizers, explosives, and other industrial products. Nitrogen is an essential element for plant growth, and it is used to produce ammonia, nitric acid, and other compounds.
In general, when referring to elements or other scientific terms it should be spelled with a capital letter, as that is standard for elements. So, it should be capitalized, so the correct answer is Nitrogen.
Therefore, Nitrogen (capitalized) is the correct answer.
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Part A Spell out the full name of the compound. a Submit Request Answer Part B mm Spell out the full name of the compound. Submit Request Answer Part C Br Spell out the full name of the compound. Part C Br Spell out the full name of the compound. Submit Request Answer Part D Spell out the full name of the compound. Submit Request Answer Part E Spell out the full name of the compound. Part E Spell out the full name of the compound. Submit Request Answer Part F Spell out the full name of the compound.
A) Answer- 3-methyl-hex-3-ene, B)Answer- 8-methyl-4-nonene, C)Answer- 9-bromo-2-nonene, D) Answer- 2,4-dimethyl-1-pentene, F) Answer- Pent-2-ene are the names of the compounds.
A chemical compound is a substance made up of two or more different elements chemically bonded together. The elements in a compound are always present in a fixed ratio, and the properties of the compound are different from those of the individual elements. The bond between the atoms in a compound is called a chemical bond.The simplest example of a chemical compound is water (H2O), which is composed of two hydrogen atoms and one oxygen atom. Another example is table salt (NaCl), which is made up of one sodium atom and one chlorine atom. Compounds can be classified into different types, such as organic compounds, inorganic compounds, acids, bases and salts.Chemical compounds can be represented by a chemical formula, which shows the elements present in the compound and their ratio. The chemical formula for water is H2O which means that it is composed of two atoms of hydrogen and one atom of oxygen.
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2. Draw The Lewis Structures For The Formation Of CaS From The Calcium And Sulfur Atoms (3 Pts)
The Lewis Structures For The Formation Of CaS From The Calcium And Sulfur Atoms is attached.
The Lewis dot structure is a means to depict the valence electron of an element as a dot-shaped representation of the electron. Understanding the chemical formula of a covalent molecule is the primary benefit of having this information.
Calcium exists in CaS as the ion Ca2+, whereas sulfur exists as the ion S2. Sulfur receives two electrons from the calcium's outermost shell in exchange for those electrons.
Ca2+S2 is the Lewis structure that represents the production of CaS from the atoms of calcium and sulfur since this is the combination that results in the formation of CaS.
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Which statement is true of atoms?
O Protons repel electrons.
O Electrons determine the atom's size.
O Most of an atom's volume is filled with matter.
O Protons attract other protons.
O All of the above
The true statement given here is - Electrons determine the atom's size.
The second statement - Electrons determine the atom's size - is true because as the number of electrons keep on increasing, the number of atomic shells to accomodate them increase, resulting in an increase in the atom's size. The first statement - Protons repel electrons - is false because protons are positively charged and electrons are negatively charged. Unlike charges attract each other whereas like charges (such as positive - positive charge interaction or negative - negative charge interaction) repel each other. The third statement - Most of an atom's volume is filled with matter - was proved wrong experimentally by Rutherford's Gold foil experiment. The fourth statement - Protons attract other protons - is false because of the same reason stated earlier, that is, like charges repel each other.
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Construct a molecular orbital energy diagram for HF by following the steps below: 1) Draw valence AOs for H and for F, placing them at appropriate relative energies based on electro negativity. Q1. Which fluorine orbitals have appropriate symmetry to overlap with H 1s? Q2. Based on orbital energies, which will interact more strongly with the H 1s? 2) Draw interaction lines and the resulting MOs, and sketch cartoons of the resulting orbitaIs. 3) What happens to the rest of the orbitals? Include them n the MOs in the center of the page 4) Fill the AOs and MOs with electrons according to the valence counts for the atoms, and label MOs appropriately. Q3. Is his diagram likely to be complicated by s- p mixing? Explain. What does your diagram tell you about H-F? S) Label the bonding and lone electron pairs in the MO diagram. Q4. What is the bond order, and what type of bonding is involved? QS. Are the bonding electrons closer to For H according to this diagram? Explain. Q6, Does this diagram agree with the valence bonding description of H-F? Explain. 6) Label the HOMO and LUMO, and sketch cartoons if you have not already done so. Q. Where is the molecule most likely to accept incoming electron density? Q8. From where is HF most likely to donate electron density?
In hydrogen fluoride, symmetry allows for HF overlap between the H 1s and F 2s orbitals, but the energy gap between the two atomic orbitals precludes them from interacting to form a molecular orbital.
Which type of orbital has more energy?P-orbitals: At every level, the p-orbitals have more energy than the s-orbitals. One node, or region with no electrons, exists in the p-orbitals.Combining the atomic orbitals of the molecules' atoms yields molecular orbitals.The s bonding orbital and the s antibonding orbital must both have two electrons, giving a total of four valence electrons.The quantity of electron pairs that connect two atoms in a bond is known as the bond order.The highest-energy MO with electrons is known as HOMO, or Highest Occupied MO.Nonmetals, which can be found in the periodic table's right-hand section, have relatively high ionization energies and so have a propensity to gain electrons.Nearer to the F atom is the electron density.Fluorine attracts the electron density toward itself since it has a substantially greater electronegativity value than hydrogen.To learn more about molecular orbital refer to :
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what is the rate of effusion for a sample of a nitrogen gas, if a sample of sulfur dioxide gas diffuses through the apparatus at a rate of 0.452 mol/min
The rate of effusion of nitrogen gas is 0.98[tex]\frac{mol}{min}[/tex].
The rate of effusion of sulphur dioxide gas, which has a mass of 64g, is 0.452; the rate of effusion of nitrogen gas, which has a mass of 14g, has to be determined.
The square root of the molar mass of a gas has an inverse relationship with the rate of effusion of that gas. As a result, the rate of diffusion or effusion of a molecule or mole of molecules is precisely proportional to the rate of movement.
Now, using the relationship between mass and rate of effusion.
[tex]\frac{rate}{rate1} =\sqrt{\frac{MM1}{MM} }[/tex]
rate= 0.452
M.M.=64g
M.M.1=14g
Putting the values of all variable in formula we get,
[tex]\frac{0.452}{rate1}=\sqrt{\frac{14}{64} }[/tex]
On solving we get,
rate1=0.98[tex]\frac{mol}{min}[/tex]
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Of the following, ________ is one of the major pollutants of groundwater. A) carbon dioxide
B) home garbage
C) acid rain
D) fertilizers from agricultural fields
E) treated sewage from cities
D) fertilizers from agricultural fields is one of the major pollutants of groundwater.
Fertilizers contain nutrients that plants need to grow, such as nitrogen and phosphorus, however, if not used or applied properly, it can run off into nearby bodies of water or seep into the groundwater. The excess nutrients can lead to algal blooms and eutrophication, which can harm aquatic life and make the water unsafe for human use.
While all of the options you provided can have negative effects on the environment, but fertilizers are specifically known to contribute to groundwater pollution.
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An aldehyde forms a carboxylic acid by
A. neutralization
B. reduction
C. hydrogenation
D. hydrolysis
E. oxidation
An aldehyde forms a carboxylic acid by E. Oxidation.
An aldehyde is a type of organic compound that contains a carbonyl group (-CO-) attached to a carbon atom that is also bonded to at least one hydrogen atom (H).
An aldehyde can be oxidized to a carboxylic acid by the addition of an oxygen atom to the carbon atom adjacent to the carbonyl group, this process is known as oxidation.
This is usually done with the help of reagents such as Chromium (VI) oxide (CrO3) or PCC (pyridinium chlorochromate). However, it should be noted that not all aldehydes can be oxidized to form carboxylic acids as some aldehydes are not stable enough to undergo oxidation.
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- What causes the trend in ionization energy across a period and within a group?
The ionization energy of elements rises as we span a period from left to right. This is brought on by the periodic drop in atom size. As we proceed from left to right, the higher nuclear charge causes the valence electrons to move closer to the atom's nucleus.
What are General periodic trends of ionization energy?In a group, while moving from top to bottom it decreases.
It increases from left to right across a period
As we go lower in a group, the first ionization enthalpy of the elements drops. The number of shells and the atomic number both rise as a group moves downward. Since they are far from the nucleus, outermost electrons are easily eliminated. The shielding effect brought on by the increasing number of shells as we progress along a group is the second component that lowers the ionization energy.
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Which of the following substances contains a nonpolar covalent bond?
A.
CaO
B.
Cl2
C.
CO
D.
BaF2
E.
HCl
Cl2 substances contains a nonpolar covalent bond.
Cl2 generally contains two identical atoms, and the main difference lies in their electronegativity values. Therefore, non-polar covalent bond exists between atoms in a molecule of Cl2 .
Hence, when we talk about Nonpolar covalent bond it lies between two hydrogen atoms as they equally share the electrons. Other examples says that nonpolar covalent bond is the bond between two chlorine atoms because they also share the electrons equally. Molecules that are made of many type of covalently bonded nonmetal atoms such as carbon dioxide gas (CO2), stays nonpolar when they are in symmetry or if their atoms have significantly equal pull.
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2) How many kilojoules of energy is needed to decompose 10.8 grams of N₂Os gas? (SOLO)
2 N₂O5 (g) + 110 kJ—->4 NO2(g) + O2(g)
The energy needed to decompose 10.8 grams of N₂O5 is 110 kJ.
It takes 110 kJ of energy to decompose 2 moles of N₂O5 (the molecular weight of N₂O5 is 108 g/mol). Since 10.8 grams of N₂O5 is equal to 0.1 moles, it takes 110 kJ of energy to decompose 0.1 moles of N₂O5, which is the same as decomposing 10.8 grams of N₂O5.
what volume of 5.00X10^-3 M HNO3 is needed to titrate 80.00 mL of 5.00X 10^-3 M Ca(OH)2 to the equivalence point
160 ml of HNO3 is needed to titrate against Ca(OH)2 to the equivalence point. This is calculated from the concept of molarity.
Molarity is defined as the number of moles of solute (n) divided by the volume (V) of the solution in liters. It is important to note that the molarity is defined as moles of solute per liter of solution, not moles of solute per liter of solvent.
Volume = moles / molarity
Ca(OH)₂ + 2HNO₃ → Ca(NO₃)₂ + 2H₂O
From the stoichiometry of the reaction it is clear that,
2 mole of HNO₃ = react with 1 mole of Ca(OH)₂
volume of Ca(OH)₂ = 80mL = 0.080L
molarity of Ca(OH)₂₂ = 5×10⁻³ M
Moles of Ca(OH)₂ = 0.080L x 5×10⁻³M = 0.0004 moles
0.0004 moles of Ca(OH)₂ = react with 2×0.0004 = 0.0008 moles of HNO₃
molarity of HNO₃ = 5×10⁻³ M
Volume of HNO₃ = 0.0008moles / 5×10⁻³ M = 0.16L = 160mL
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Which substance is most likely to dissolve in greater quantities in cold water? (1 point).
Option C: Sugar is most likely to dissolve in greater quantities in cold water.
Because of the energy released during intermolecular interactions between the polar water molecules and the slightly polar sucrose molecules, sugar dissolves in water. The energy required to destabilize the structure of both the pure solute and solvent is made up for by the weak bonds that develop between the solute and the solvent.
Because hot water has more energy than cold water, sugar dissolves more quickly in hot water. As water is heated, the molecules gain energy and move farther. As they move more quickly, they come into contact with the sugar more frequently, causing it to melt more quickly.
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Complete question is:
Which substance is most likely to dissolve in greater quantities in cold water?
a) potassium chloride
b) sodium chloride
c) sugar
d) oxygen
Which of the following is an invalid set of quantum numbers?
Multiple Choice
n = 3 l = 3 ml = 2 ms = –½ (A+)
n = 2 l = 1 ml = -1 ms = +½ (B)
n = 6 l = 4 ml = 2 ms = +½ (C)
n = 5 l = 4 ml = -3 ms = –½ (D)
An invalid set of quantum number is n = 3 l = 3 ml = 2 ms = –½ (A+)
Several rules apply here:
n≥1 in integer increments.
l≥0 And has a ranger from 0 to n-1 in integer increments.
ml= (-l........+l)
ms = ± 1/2
The first three inputs n, l, and ml—define the specific orbital of interest, and the fourth input—ms—defines the number of electrons that can occupy that orbital.
For the format
(n,l,ml,ms)
n = 3 l = 3 ml = 2 ms = –½ is invalid because n=l (The principal quantum number (n) can not have a value of zero. Therefore, the permitted values for n are 1, 2, 3, 4, and so forth. Any integer between 0 and n – 1 can serve as the angular quantum number (l). For instance, if n = 3, l can only be one of 0, 1, or 2, but not three.)
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I understand that scientists can be more or less certain of their claims depending on the evidence they have. yes or no? and why?
Yes, scientists can be more or less certain of their claims depending on the evidence they have.
This is because scientific claims are based on evidence and are subject to testing and evaluation. Scientists use various methods, such as experiments, observations, and data analysis, to gather evidence and test their claims. The more evidence a scientist has to support a claim, the more certain they can be of its validity.
However, even with strong evidence, scientific claims are always subject to revision or modification as new evidence becomes available. This is because scientific knowledge is constantly evolving and improving as new discoveries are made and old theories are revised or refined.
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Name
Water
Formula Structure
Hydrogen
H₂O
Bromide
HHHH
Butane C₂H10 H-C-C-C-C-H
TIIT
HHHH
*ö**
H
Methanol CH₂OH H-C-O-H
H
HBr
H
Methane CH₂
H
H-Br:
H-C-H
H
Polarity
☐
#Polar
# Nonpolar
Here, the polar molecules are water and methanol, while the other chemicals such as methane, butane, and bromide are nonpolar molecules as they don't react with the water.
What are polarity and non polarity?The polar molecules, such as the water and the methanol, can react with water molecules, as the water is H₂O and the methanol is CH₂OH, while others, such as methane, which is CH₄, bromide, HBr, and butane (C₄H₁₀), are not dissolved in water and can be dissolved in nonpolar solutions.
Hence, here, water and methanol are polar molecules, while the other chemicals such as methane, butane, and bromide are nonpolar molecules as they don't react with the water.
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What volume of 0.2000 M sulfuric acid is required to neutral-
ize 800.0 mL of 0.1000 M potassium hydroxide?
(A) 200.0 mL
(B)
400.0 mL
(C) 800.0 mL
(D) 1600. mL
Answer:
c. 800.0 mL
.
.
.
.
.
.
.
.
.
.
.
.
.
.
How many moles of Al³+ are there in 3 moles of Al₂(SO4)3?
The moles of Al³+ are there in 3 moles of Al₂(SO4)3 is 0.14 mole.
What is mole ?The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.
The mole, which is denoted by the symbol "mol," is the volume of a system that includes as many elementary particles as there are atoms in 0.012 kilogrammes of carbon 12.
No. of moles = mass / molecular mass
Given, mass of Al2(SO 4) 3 = 60g
Molecular mass of Al2(SO 4) 3
= 2 × 27 +3 ( 32 + 4 × 16 )
= 342g
moles of Al³+ = 60 / 342
= 0.14 mole
Thus, The moles of Al³+ are there in 3 moles of Al₂(SO4)3 is 0.14 mole.
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A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. given that there are 0.035273 ounces in a gram and 2.54 centimeters in an inch, how many grams would a 14.79 cm length of the same iron rod weigh? a. 73.30 g b. 274.49 g c. 640.51 g d. 1,626.89 g please select the best answer from the choices provided a b c d
A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. 640.51 g would a 14.79 cm length of the same iron rod weigh.
First, we know that there are 0.035273 ounces in a gram, so we can convert the weight of the one-inch-long segment of iron from ounces to grams by multiplying by 0.035273.
3.88 ounces * 0.035273 = 137.7 grams
We can use this conversion factor to calculate the weight of the 14.79 cm segment of iron:
137.7 grams * (14.79 cm / 2.54 cm) = 664.6 grams.
The correct answer is c. 640.51 g
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A segment of an iron rod that is one inch long and 3.88 ounces thick has a consistent density. A 14.79 cm length of the identical iron rod would weigh 640.51 g.
First, we can convert the weight of the one-inch-long iron fragment from ounces to grammes by multiplying by 0.035273, as we are aware that there are 0.035273 ounces in a gramme.
3.88 ounces times 0.035273 equals 137.7 grammes.
The weight of the 14.79 cm segment of iron can be determined using the following conversion factor:
(14.79 cm / 2.54 cm) x 137.7 grammes equals 664.6 grammes.
The right response is c. 640.51 g.
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Choose the best Lewis structure for SeO42-.
The correct Lewis structure of selenium tetroxide is the fourth one, with two double bonds with oxygen and two single bonded oxygens each with one negative charge.
What is Lewis structure?Lewis structure helps to determine the valence electrons, bonded pair of electrons, unpaired electrons of atoms in a compound. The electrons are represented as tiny dots or stars around the symbol of atom.
Selenium tetroxide is a covalent compound. Both selenium and oxygen are having two valence electrons. Two oxygen shares two of its electrons with sulphur and sulphur in turn shares its electrons and donate two electrons with the other tow oxygens.
The two oxygen atoms which gains an electron will acquire a negative charge. Thus, two double bonds are formed between selenium with two oxygen atoms. Thus, fourth image is correct.
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You wish to electroplate a metal utensil with a surface area of 736 cm2 with gold to give an average thickness of 0.025 mm over the entire surface. Starting with a solution of excess Au3 and applying a constant current of 14 A, how long will it take to electroplate the utensil
4350 sec long will it take to electroplate the utensil
Step1 Mass of gold = Surface areax Thickness x Density = 736 x .0025 x 19.3= 35.512 g
Step2 Au +3 + 3e ----> Au
Step3 (196.97/3) g of Au is deposited by = 96500 coulombs
35.512 g will be deposited by =96500 x3x 35.512/196.97 = 52194.36 coulombs
Step4 Time taken = 52194.36/12 = 4349.53 s = 4350 s
intend to electroplate a metal object with a surface area of 736 cm2 with gold, giving the surface an average thickness of 0.025 mm. Using an excess Au3 solution as a base and a 14 A continuous current,
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at 35 °c, the ph of 0.10 m naoh is 12.68. what is the value of kw at this temperature?
At 35°C, the value of Kw (the ionic product of water) is 1.16 x 10^-14.
The pH of a solution is determined by the concentration of hydrogen ions (H+) in the solution. The pH of a 0.10 M NaOH solution at 35°C is 12.68. The pH of a solution is related to the ionic product of water (Kw), which is defined as the product of the concentrations of the hydrogen (H+) and hydroxide (OH-) ions in the solution. At 35°C, the value of Kw is 1.16 x 10^-14.
At 35°C, the value of Kw (the ionic product of water) is 1.16 x 10^-14.
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what are the products in the chemical reaction of vinegar and baking soda to form sodium acetate water and carbon dioxide
Salt (sodium lactate), water, or carbon dioxide gases are the products of a reaction that happens when hydrogen peroxide (sodium bicarbonate) or vinegar (acetic anhydride) are mixed.
A chemical reaction is what?One or more chemicals, also referred to as reactants, are transformed into one or more other substances, often referred to as products, in a chemical reaction. Substances are constructed up of chemical components or chemical elements. A chemical reaction occurs once a or more chemicals change into one or several other substances. An illustration of this is when iron and gas mix to produce rust. Vinegar and soda soda together result in the production of water, carbon dioxide, and sodium acetate.
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Classify each example of molecular art as a compound or element. Moreover, where applicable, specify which of the species are molecules
These species are molecules
Carbon Monoxide: CompoundDihydrogen Monoxide: CompoundHydrogen Gas: ElementNitrogen Gas: ElementOxygen Gas: ElementCarbon Dioxide: Compound, MoleculeWater: Compound, MoleculeWhat is a molecule?A molecule is a group of atoms held together by chemical bonds. Molecules are the smallest particles of a substance that retain its chemical properties, and they can be made up of single atoms, or multiple atoms of different elements. Molecules can range in size from single atoms up to complex structures containing hundreds of atoms.
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If a hydrogen atom electron jumps from the n=2 orbit to the n=6 orbit, energy is released True False QUESTION 20 What is the concentration of lithium sulfate if the total ion concentration is 1.54 M?
False, If a hydrogen atom electron jumps from the n=2 orbit to the n=6 orbit, energy is released.
The energy of an electron in an orbit of the hydrogen atom depends on the principal quantum number (n). The energy increases with increasing the value of n. Here electron jumps from orbit with n=2 (lower energy) to an orbit with n=6 (higher energy). So energy has to absorb for this electron jump. So energy release is false.
The concentration of lithium sulfate is 0.513M if the total ion concentration is 1.54 M.
Lithium sulphate can dissociate into ions by the reaction
[tex]Li_{2}SO_{4}[/tex] [tex]\rightarrow[/tex] 2[tex]Li^{+}[/tex] + [tex]SO_{4}^{2-}[/tex]
Let us consider Lithium sulphate concentration is x mole/L.
So, x mole 2x mole x mole
Total ion concentration = (2x+x) = 1.54 M (provided)
so, 3x = 1.54 M and x= 0.513 M
[tex]Li_{2}SO_{4}[/tex] concentration is 0.0513 M.
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Sodium+Oxygen.
Do the Work. It is Ionic Bonds we are learning today.
Answer:
[tex]Na_{2} O[/tex]
Explanation:
To write the correct formula for sodium oxide, we can use the periodic table to see how many valence electrons they will lose/gain. Since sodium will lose one electron and oxygen will gain 2 electrons, you need two sodium for every oxygen ion. Therefore, the formula is [tex]Na_{2} O[/tex].
1) (6.4G) What percentage of the
model is shaded?
2)
The corresponding ratio is 146/200, or 73% of the model is shaded. The comparable decimal is 0.73.
What is Fraction?Part of a whole is represented by a fraction.
Given, a grid of one hundred squares. Shaded squares total 73.
We must determine what proportion of the model is darkened.
100 grids total, 73 of which are shaded.
The model is partially tinted (73%).
Find the comparable ratio of 73/100 now.
2 times both the numerator and denominator
73/100×2/2 146/200 The comparable ratio is 146/200.
This is the comparable decimal: 73/100=0.73.
The comparable fraction is 146/200.
Therefore, 146/200 is the corresponding ratio and 73% of the model is shaded. The analogous decimal is 0.73, and the equivalent fraction is 146/200.
Why is it hard to model a percentage in regression?It can be challenging to select the best modeling strategy when the dependant variable in a regression model is a proportion or percentage. Ordinary linear regression has a major flaw in that it can predict values that aren't feasible, such as values below 0 or above 1.
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Approximate the work for the following reaction at 300 K. CH4 (g) + 202 (g) CO2 (g) + 2H20 (0) O-2.5 k 0-7.5 kJ 7.5k 2.5 k
Approximately work done for the reaction will be done 5 KJ.
CH4 (g) + 202 (g) CO2 (g) + 2H20 (0)
∆ng = 1-3 = -2
Work (W) = -∆ ng RT
W = - (-2) x 8.314 x 300/ 1000
W = 5 KJ
Work being done on the system is a good sign. If the system is doing the work, it has a negative sign. Consequently, there is a good sign in the energy coming into the elephant's front legs. When there are more moles of gaseous products than there are gaseous reactants in a chemical reaction, the system is said to have exerted work on the environment. I
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Draw the Lewis structure of Asoshowing 2 one pairs Identify the molecular geometry of AsO trigonal planar Rings More Draw Erase see-saw square planar 0 O trigonal bipyramidal linear 0 tetrahedral As square pyramidal octahedral O bent OT-shaped O trigonal pyramidal 0: : 0 What are the approximate bond angles in AsO? What is the hybridization of the central As atom? 120 O 109.5。 90° O 180° O sp2 An AsO ion is 0 nonpolar Opolar.
The Lewis structure of AsO showing 2 lone pairs is as follows:
O
As
/
X X (where X represents a lone pair)
The molecular geometry of AsO is trigonal planar. The central As atom is hybridized with sp2 hybridization. The approximate bond angles in AsO are 120 degrees. The AsO ion is polar.
A Lewis structure, also known as a Lewis dot diagram, is a way to represent the chemical bonding in a molecule. It uses dots (also called electron dots or Lewis dots) to show the valence electrons on an atom, and lines to show the bonds between atoms. The goal of drawing a Lewis structure is to use the valence electrons of the atoms in a molecule to form the most stable arrangement of atoms, that is to say, to achieve the octet rule where each atom has 8 valence electrons in its outermost shell.
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