Draw the Lewis dot structure for Al.

The trend for the ionic radius as the atomic number increases in Period 2 is that it decreases.

In general, the ionic radius of an element is the distance between the nucleus and the outermost stable electron shell of an atom or ion. As the atomic number increases, the number of protons in the nucleus also increases, which creates a greater positively charged force (the positively charged protons) pulling the electrons closer to the nucleus. This causes the radius of the outermost stable electron shell to decrease, and therefore the ionic radius also decreases.

In Period 2, the atomic number increases from Z = 3 (Lithium) to Z = 10 (Neon). The ionic radius of Li+ is 0.76 Å and the ionic radius of Ne2+ is 0.43 Å, Therefore, the ionic radius decreases as the atomic number increases within Period 2.

The statements which true about distillation boiling point determination are:

Distillation is the process which happens when a liquid sample is volatilized to produce a vapor which is subsequently condensed to a liquid richer in the more volatile components of the initial sample. It is symbolized at its simplest when steam from a kettle turns deposited as drops of distilled water on a cold surface.

Regarding the distillation boiling point determination, the temperature at where a liquid's vapor pressure reaches equilibrium with atmospheric pressure is called the liquid's boiling point. To accomplish distillation at decreased pressure, it is needed to record the external pressure. The sample have to be as pure as is practical. When the contaminants are dissolved, the liquid's boiling point increases. Thus, the recorded boiling point will not be exact. And to measure temperature changes properly, the thermometer's tip has to be placed in the liquid.

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The selection from the section that provides further support for the claim is that B. Food, energy, medicine, water, protection from storms and floods and slowing climate change are some of the 18 ways nature helps keep people alive, the report said.

Selection 2, "Food, energy, medicine, water, protection from storms and floods and slowing climate change are some of the 18 ways nature helps keep people alive, the report said." provides further support for the claim that humans need nature.

It lists several specific ways in which nature is essential for human existence and good quality of life, and it is align with the statement "Nature is essential for human existence and good quality of life," the report said. Additionally, it provides an estimation of 18 ways which nature helps human to survive, adding more weight on the statement.

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Noble gasses are found uncombined, as monatomic species in nature.

The noble gases are chemical elements group 18 or VIIIA in the periodic table. This group is also known as the helium or neon group and the aerorogen group. This group consists of the elements helium (He), Neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), the radioactive element radon (Rn), and the radioactive synthetic element oganesson (Og). All members of group 18 (VIIIA) elements are noble gases, are non-metallic, and are in the form of gas at standard temperature and pressure, except for oganesson (which is predicted to be solid and have properties like metals).

It is called noble because these elements are very stable (very difficult to react). The first noble gas element to be discovered was argon, which was discovered by an English chemist named Sir William Ramsey. None of the natural compounds of the noble gases were found. According to Lewis, the stability of the noble gases is due to their fully filled electron configuration, namely the octet (duplet) configuration for helium. The stability of the noble gases is reflected by their very large ionization energies, and their very low electron affinity (signed positive). Ancient experts believed that the noble gas elements were completely inert. This opinion was disproved, after in 1962, Neil Bartlett, a chemist from Canada managed to make a xenon compound, namely XePtF6 (xenon hexafluoroplatinate). Since then, various noble gas compounds have been produced.

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1. The correct answer is basic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The barium cation has a +2 charge, so it will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, making the barium cation basic in nature.

2. The correct answer is acidic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The cyanide anion has a -1 charge, and will donate a single hydrogen ion to the water, forming the hydronium ion, H3O+, making the cyanide anion acidic in nature.

3. The correct answer is neutral. An aqueous solution of barium cyanide, Ba(CN)2, will be neutral. When the compound is dissolved in water, it will dissociate into barium cations and cyanide anions.

The barium cation will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, and the cyanide anion will donate one hydrogen ion to the water, forming the hydronium ion, H3O+. These two processes will cancel each other out, resulting in a neutral solution.

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Answer: broken rib bone

Explanation: you’re not able to put a cast inside your ribs

(R)-3-bromo-2,3-dimethylpentane.

The product that was created using Markovnikov's rule is considered to be the major product out of the two conceivable products.Most of the time, this substance will form (70%–95%).The minor product is the name for the substitute.

Carbohydrates, lipids, protein, and nucleotides are organic molecules necessary for human function.

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Answer:

See below

Explanation:

13.  The molar mass of Cl2 is 70.9 grams/mole.  Mass of 0.560 moles:

(0.560 moles)*(70.9 grams/mole) = 39.7 grams Cl2

14.  2 moles of M93N2 has 2*2 = 4 moles of N atoms

15.   2.00 moles Mg3N2 has 2*2 = 4 moles N atoms

16.  9.0 grams of Ag.  The molar mass of silver is 107.9 g/mole.  9.0 grams means that there is (9.0g/(107.9 g/mole) = 0.0834 moles Ag.  

   (0.0834 moles Ag)*(6.022x10^23 Ag atoms/mole) = 5.02x10^22 atoms of silver

The mass of 0.560 moles of chlorine gas is 39.7 g. There are 6.00 moles of Mg atoms and 4.00 moles of N atoms respectively in 2.00 moles of Mg3N2 compound. The number of atoms in 9.0 g of silver can be calculated by converting the grams to moles then multiplying by Avogadro's number.

The mass of chlorine gas can be calculated by multiplying the given moles with the molar mass of chlorine. The molar mass of chlorine (Cl2) is approximately 70.9 g/mol. Therefore, the mass of 0.560 moles of chlorine gas would be 0.560 * 70.9 = 39.7 g.

For Mg3N2, there are 3 moles of Mg per mole of Mg3N2, so there are 2.00 * 3= 6.00 moles of Mg atoms in 2.00 moles of Mg3N2. Similarly, there are 2 moles of N per mole of Mg3N2 so, there are 2*2.00 = 4.00 moles of N atoms in 2.00 moles of Mg3N2.

The number of atoms in silver can be calculated using Avogadro's number, which is 6.02 x 10^23 atoms per mole. First convert the mass to moles (silver has a molar mass of approximately 107.87 g/mol) and then multiply by Avogadro's number.

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The metal that would be displaced from the solution of its salts is option C) Ag

Silver has a higher standard electrode potential (reduction potential) than any of the other three metals. Therefore, each of them would remove (decrease) it from its salt solution.

Since Ag is less reactive than Mg, Zn, and Cu, the other three metals would displace silver (Ag) metals from the solution of its salts.

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The rate of a chemical reaction is a measure of how fast the reaction is occurring. Knowing the rate of a reaction allows chemists to understand the reactivity of different compounds and predict the outcome.

Chemists are concerned with the rates of chemical reactions because:

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CH3 CH3 is a tertiary carbocation. A tertiary carbocation is the most stable carbocation due to the electron releasing effect of three methyl groups.

Carbocations are generally stabilized with the neighboring carbon-carbon multiple bonds. Carbocations that are present adjacent to some other carbon-carbon with double or triple bond are having very special stability the reason is having a overlap between the empty p orbital of the carbocation.

Hence, tertiary carbocation is considered as most stable carbocation because of electron releasing effect of three methyl groups. so, we can say that Greater the number of alkyl groups attached to a positively charged carbon atom, greater will be hyperconjugation interaction and +I effect of methyl group will stabilize the cation.

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70% is the concentrations of carbon in a-ferrite and Fe3C at a temperature just below 727°C.

The compounds of metals are present in the form of oxides, Sulphides, carbonates, chlorides. The natural material in which the metals or their compounds are found in earth are called minerals. Some of the minerals may contain a large percentage of metal whereas others may contain only a small percentage. the concentrations of metal in seawater varies from place to place and often dependent on local conditions. Although most metals are generally low in seawater, this will depend on possible pollution, geochemistry and microbial activities. The best way is to compare your results to local literature. By this information, we can consider that 70% is the concentrations of carbon in a-ferrite and Fe3C at a temperature just below 727°C.

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Answer:no idea

Explanation:

I js needed points

A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force.

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1) Radius of the n = 8 orbit is 33730 pm. 2) 5.22 x 10^-19 J is the energy in kilojoules of a mole of photons of this frequency. 3) (a) energy is E = -8.7 x 10^-19 J, (b) energy is E = -2.7 x 10^-19 J, (c) energy is E = -6 x 10^-19 J

1. The Bohr model of the atom describes the electrons of an atom as being in specific energy levels (orbits) around the nucleus. The radius of each orbit is proportional to the principal quantum number (n) of the electron.

The radius of the n = 8 orbit in a N6+ ion can be calculated using the equation:

r = 0.529 x 10^-10 m x (n^2)

r = 0.529 x 10^-10 m x (8^2)

r = 0.529 x 10^-10 m x 64

r = 3.373 x 10^-9 m

r = 3.373 x 10^-9 m x 10^12 pm

r = 33730 pm

2. The energy of a photons can be calculated using the equation:

E = h x f

E = (6.626 x 10^-34 Js) x (7.95 x 10^14 s^-1)

E = 5.22 x 10^-19 J

3. To calculate the energy of a mole of photons, we need to know Avogadro's number (6.022 x 10^23 photons/mol)

Energy per mole of photons = (E of single photon) x (Avogadro's number)

Energy per mole of photons = (5.22 x 10^-19 J) x (6.022 x 10^23 photons/mol)

Energy per mole of photons = 3.15 x 10^5 J/mol

Energy per mole of photons = 315 kJ/mol

a) The energy of the n = 5 level of a H atom can be calculated using the equation:

E = -13.6 eV x (1/n^2)

E = -13.6 eV x (1/5^2)

E = -13.6 eV x 0.04

E = -0.544 eV

E = -0.544 eV x (1.60218 x 10^-19 J/eV)

E = -8.7 x 10^-19 J

b) The energy of the n = 9 level of a H atom can be calculated using the equation:

E = -13.6 eV x (1/n^2)

E = -13.6 eV x (1/9^2)

E = -13.6 eV x 0.0123

E = -0.167 eV

E = -0.167 eV x (1.60218 x 10^-19 J/eV)

E = -2.7 x 10^-19 J

c) The energy for the n = 5 to n = 9 transition can be calculated by subtracting the energy of the initial state from the energy of the final state.

E = Efinal - Einitial

E = (-2.7 x 10^-19 J) - (-8.7 x 10^-19 J)

E = -6 x 10^-19 J

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The compounds that would be expected to have the lowest boiling point because it has the weakest physical bonding is  CH4.

Option C is correct.

The boiling point of any substance is described as the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

We can conclude that CH4 has the weakest boiling point because the magnitude of London dispersion forces decreases with a decrease in molecule size.

Therefore, the shortest, most branched molecule in this given options will have the lowest boiling point.

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The shape of the molecule is tetrahedral due to the 4 pairs of electrons around the silicon atom.

The Lewis dot structure for SiO4^-4 is shown below:

Si: O

:O:  O

   O

There are 8 bonding pairs and 4 lone pairs on the central atom, giving a total of 12 electrons. The shape of the molecule is tetrahedral.

1. The Lewis dot structure for SiO4^-4 is drawn by placing 4 oxygen atoms around the central atom (silicon) and connecting them with single bonds.

2. Each oxygen atom has 6 valence electrons, for a total of 24 electrons.

3. Silicon has 4 valence electrons, for a total of 28 electrons.

4. The 4 oxygen atoms form 8 bonding pairs with the silicon atom, leaving 4 lone pairs.

5. The total number of electrons around the central atom is 12 (8 bonding pairs and 4 lone pairs).

6. The shape of the molecule is tetrahedral due to the 4 pairs of electrons around the silicon atom.

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two body functions that help regulate acid-base balance in body are the kidney & lungs that work continuously to help with regulatory oversight of acid base balance by excreting the excess acidic and basic ions.

A Brnsted-Lowry acid or Lewis acid is a molecule or ion that has the ability to donate a protons or establish a covalent bond with just an electron pair. Proton donors, also known as Brnsted-Lowry acids, are the first class of acids.

The word "acid," which refers to the sour flavor and pungent odor of numerous acids, derives from the Latin word acidus, which meaning "sour." Examples: Because acetic acid and water are diluted, vinegar has a sour flavor. Citrus juice

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The pH value is 9.93, the pOH value is 9.3 the [H30+] value is  1.17 x 10^-10 M, and the [OH-] value is  1.17 x 10^-10 M.

A Lewis structure, also known as a Lewis dot diagram, is a way to represent the bonding and non-bonding electrons in a molecule. It is named after Gilbert N. Lewis, who introduced it in 1916. A Lewis structure shows the chemical symbol of each atom in the molecule and the electrons that are involved in the chemical bonds. It is used to predict the molecular geometry, reactivity, and other chemical properties of a molecule.

The Lewis structure for aniline, C6H5NH2, is:

H H

| |

C-C-C-C-C-C

|

N-H

When aniline dissolves in water, it acts as a weak base, accepting a proton from water to form the conjugate acid, C6H5NH3+. The balanced equation for this reaction is:

C6H5NH2(aq) + H2O(l) <--> C6H5NH3+(aq) + OH-(aq)

The acid dissociation constant (Ka) for the reverse reaction is given as Ko = 3.9 x 10^-10. To calculate the pH, POH, [H3O+] and [OH-] of a 0.30 M solution of aniline, we can use the following equations:

Ka = [C6H5NH3+][OH-] / [C6H5NH2]

Given Ka = 3.9 x 10^-10, [C6H5NH2] = 0.30 M and solving the above equation, we get [C6H5NH3+] = 1.17 x 10^-10 M and [OH-] = 1.17 x 10^-10 M

pH = -log[H3O+] = -log(1.17 x 10^-10) = 9.93

pOH = -log[OH-] = -log(1.17 x 10^-10) = 9.93

[H3O+] = 1.17 x 10^-10 M

[OH-] = 1.17 x 10^-10 M

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Sodium bisulfite converts the bromine (Br₂) to the bromide (Br-). Sodium bisulfite is an reducing agent.

The reducing agents are the substances which will loses the electrons to the other substances in the redox redox reaction and it will get oxidized to the higher valency state. The Sodium bisulfite converts the bromine (Br₂) to the bromide (Br-) ion . Sodium bisulfite is called as an reducing agent.

The reactant that acts as reducing agent will it self get oxidizes. The one which will act as a oxidizing agent itself gets reduced. So, in the given reaction sodium bisulfite acts as reducing agents.

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The complete ground state configuration for the aluminum is 1s² 2s² 2p⁶ 3s² 3p¹. The atomic number of the aluminum is 13.

The atomic number of the Aluminum is 13. For the neutral atom of the Aluminum , it contains the 13 protons and the 13 electrons. The ground state electron configuration is  1s² 2s² 2p⁶ 3s² 3p¹. The noble has configuration for the aluminum is [Ne] 3s² 3p¹. The atom in the lower energy level is said to be in the ground state.

The electrons arranged according to their energy levels. The ground state electron configuration of the electrons around the nucleus with lower energy levels for the given atom.

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If 100 g of calcium carbonate is allowed to decompose, 56 g of calcium oxide is produced. The mass of carbon dioxide is produced by the decomposition will be 44g

According to the given equation

CaCO₃ → CO₂ + CaO

As

mass of CaCO₃ = 100g

mass of CaO = 56g

mass of CO₂= ?

depending on the conservation of mass

mass of the reactant = mass of the product

100 g  =  ( X +  56 )

mass of CO2 =  100 - 56

= 44 g

So the mass of carbon dioxide is produced by the decomposition will be 44g

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choose the pair of terms that completes this sentence:

hydroxyl is to alcohol as amino is to amine.

Amino acids are the building blocks of proteins and are found in a variety of natural and man-made sources. Most amino acids are naturally produced  by plants and animals, but some are  synthesized in the laboratory.Unnatural amino acids are  used  to study protein structure and function  or to create new proteins with desired properties.

Amino acids are divided into three groups:Essential amino acids,nonessential amino acids and conditional amino acid.

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Co oxidises to Co after reducing Ni to Ni (0). (III). Co is a reducing agent,

3Ni2+(aq)+2Co(s)⟶2Co3+(aq)+3Ni(s)

The charge that indicates an object's capacity to gain, lose, or share electrons is known as the oxidation number.

Increasing the number of oxidations is oxidation.

Co is oxidised, changing from Co(0) to Co. (III).

Decrease in oxidation number equals reduction.

Ni (II) is reduced to Ni2+ from Ni2+ (0).

An oxidising agent is something that reduces itself while oxidising others.

Ni2+ reduces itself to Ni after oxidising Co to Co (III) (0). Ni2+ is an oxidising agent, then.

A reducing agent is something that both reduces other things and oxidises itself.

Co oxidises to Co after reducing Ni to Ni (0). (III). Co is a reducing agent, then.

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After reducing Ni to Ni, Co oxidises to Co. (0). (III). Co is a decreasing agent. 3Ni2+(aq)+2Co(s)⟶2Co3+(aq)+3N The oxidation number is the charge  shows an object's ability to receive, lose,  share electrons.

Oxidation is the process of increasing the number of oxidations.Co undergoes oxidation, transforming from Co(0) to Co. Reduction is equal to a decrease in the oxidation number. From Ni2+, Ni (II) is reduced to Ni2+ (0). An oxidising agent is anything that oxidizes others while reducing itself. After oxidizing Co to Co (III), Ni2+ decreases to Ni (0). Ni2+ is therefore an oxidizing agent. A reducing agent is anything that both reduces and oxidizes other substances. After reducing Ni to Ni, Co oxidises to Co. (0). (III). Co is a decreasing agent.After reducing Ni to Ni, Co oxidises to Co. (0). (III). Co is a decreasing agent. 3Ni2+(aq)+2Co(s)⟶2Co3+(aq)+3N The oxidation number is the charge  shows an object's ability to receive, lose,  share electrons.

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(Bromodisulfanyl) Thiolohypobromite | Br2S3 - PubChem.The quantity of atoms in a molecule is indicated by numerical prefixes.

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The Lewis structure of C5H10 help us to visualize the valence electron and molecules whether they are present in bond or as lone pair.

Cyclopentane appears as a clear colorless liquid with a petroleum-like odor. Flash point of -35 °F. Less dense than water and insoluble in water. Vapors are heavier than air. Cyclopentane is a cycloalkane that consists of five carbons each bonded with two hydrogens above and below the plane. The parent of the class of cyclopentanes. It has a role as a non-polar solvent. It is a member of cyclopentanes, a cycloalkane and a volatile organic compound. Cyclopentane is an alicyclic compound with formula C5H10 . The electron dot structure helps us to visualize the valence electrons and molecules whether they are present in bond or as lone pair.

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When solutions of hydrochloric acid and sodium hydroxide react, they produce sodium chloride and water, and after the completion of the reaction leaves the resulting solution in a warm place. After the water evaporates from the solution and we get the sparkly crystal of NaCl.

A neutralization reaction can be demonstrated as a kind of reaction where a basic solution and an acidic solution react with each other to create salt and water.

The acidic strength of the resulting solution can be determined from the pH of the neutralized reaction. When a strongly acidic solution is added to a strongly basic solution the salt produced can be neutral.

When hydrochloric acid reacts with sodium hydroxide (a strong base), the formed salt is NaCl and H₂O.

[tex]HCl + NaOH \longrightarrow NaCl + H_2O[/tex]

The use of indicator thymolphthalein tells about the completion of the chemical reaction. The dry crystals of sodium chloride can be obtained after the evaporation of water.

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The amount of reactant to product in a chemical reaction can be compared to derive the equilibrium constant, which is used to predict chemical behaviour.

The ratio of the amount of reactant to the amount of product that is used to predict the chemical behaviour of a reaction is known as the equilibrium constant for chemical reactions. The rate constants remain unchanged at a specific temperature.

The law of mass action states that for a system in equilibrium, K is related to the ratio of the equilibrium concentrations of the products to the reactant concentrations raised to their respective powers to match the coefficients in the equilibrium equation. The expression for the equilibrium constant is the ratio.

Therefore, the answer is:

To the stated response

[tex]$3 A_{(g)}+B_{(g)} \rightleftharpoons 2 C_{(g)}+2 D_{(g)}$[/tex]

A statement of the equilibrium constant will be

[tex]$K_c=\frac{\left[C^2 \cdot[D]^2\right.}{\left|A^3 \cdot\right| B \mid}$[/tex]

where A, B, C, and D are present in the following molar concentrations: [A], [B], [C], and [D].

The complete question is:

Write the equilibrium-constant expression for the reaction shown in terms of

[A],[B],[C],and [D].

3A(g)+B(g)↽−−⇀2C(g)+2D(g)

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when ca2+ concentration in the blood becomes lower than normal,parathyroid hormone is released.

This drug is a synthetic version of the hormone parathyroid, which is naturally produced by your body's parathyroid glands. Your body's calcium and phosphorus levels are regulated and kept in balance by the parathyroid hormone. In order to address low blood calcium caused by insufficient parathyroid hormone, this drug is combined with calcium and vitamin D.More than 7,000 times less calcium ions are present in the intracellular fluid of cells than in the blood plasma.Serious negative effects from parathyroid hormone are possible. If you have any of the following symptoms due to elevated calcium levels: nausea, vomiting, constipation, excessive thirst or urination, muscular weakness, bone pain, disorientation, loss of energy, or fatigue, call your doctor right once. You could experience low calcium levels if you stop taking parathyroid hormone.

complete question:When Ca2+ concentration in the blood becomes lower than normal, __________.

parathyroid hormone is released

growth hormone is released

calcium salts deposit in the blood vessels

testosterone is released

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