The table lists the lattice energies of some compounds. Compound Lattice Energy (kJ/mol) LiF –1,036 LiCl –853 NaF –923 KF –821 NaCl –786 Which statement about crystal lattice energy is best supported by the information in the table? The lattice energy increases as cations get smaller, as shown by LiF and KF. The lattice energy increases as the charge of anions increases, as shown by LiF and LiCl. The lattice energy decreases as anions get smaller, as shown by NaCl and NaF. The lattice energy decreases as the charge of cations decreases, as shown by NaF and KF.

Answers

Answer 1

Answer:

Answer :Option A) The lattice energy increases as cations get smaller, as shown by LiF and KF.

Explanation : It is observed that lattice energy is mostly influenced by two main factors of an ionic solid which are;

i) The charge on the ions - As the charge of the ions increases, the lattice energy is observed to increase too.

and

ii) The radius, or size, of the ions- As the size of the ions increases, the lattice energy decreases with it.

So, here in this question the second reason is clearly observed. Hence, it is self-explained that the size of the cations are decreased in the ionic solids the lattice energy increases.

Answer 2

Answer: The best and the most correct answer among the choices provided by the question is the first choice. The statement the supports the information is "The lattice energy increases as cations get smaller, as shown by LiF and KF." I hope my answer has come to your help. God bless and have a nice day ahead!

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What is the number of electrons in a completely filled second shell of an atom?(1) 32 (2) 2 (3) 18 (4) 8

Answers

The number of electrons in a completely filled second shell of an atom will be 8.

What is atom?

The basic number of ordinary components that make up a chemical element is just an atom.

What is shell?

As per Bohr's atomic model, electrons orbit or shell surrounding the nucleus in a precise circular path.

It is known that by the electronic configuration atoms posses 2,8,18,32.

Hence, there are 8 electron will be found in second shell of the atom.

The number of electrons in a completely filled second shell of an atom will be 8.

To know more about shell and atom.

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The number of electrons in a completely filled second shell of an atom is 8.
Hope this helped.

What does Hess’s law state?

Answers

Hess's law states that the energy change in an overall chemical reaction is equal to the sum of the energy changes in the individual reactions comprising it. In other words, the enthalpy change of a chemical reaction (the heat of reaction at constant pressure) does not depend on the pathway between the initial and final states. The law is a variation of the first law of thermodynamics and conservation of energy.

Answer:

C. The enthalpy of a reaction is the sum of the enthalpies of intermediate reactions.

Explanation:

The heat of any reaction ΔH∘f for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction.

How are sound energy and light energy similar?A.
They are both carried from place to place by particles.
B.
They are both kinds of mechanical energy.
C.
They both need a medium to travel through.
D.
They both have a wavelength and a frequency.
Explanation

Answers

HOPE THIS WILL HELP U

D. They both take the form of a wave and have frequency :)

Which process is exothermic?(1) boiling of water
(2) melting of copper
(3) condensation of ethanol vapor
(4) sublimation of iodine

Answers

Answer:

The correct answer is option 3.

Explanation:

Condensationof ethanol vapors is an exothermic process. This is because particles in gaseous has highest energy . Some of this energy gets released when these particles or ethanol vapors condenses into a liquid state where they have less amount of energy in comparison to gaseous state.

$C_2H_5OH(g)\rightarrow C_2H_5OH(l) + Heat$

As we know that exothermic reaction are those reaction in which heat is released into the surroundings.

Where as the other options are example of an endothermic reaction.where heat is absorbed from the surroundings.

Hence, the correct answer is option 3.

Which of the following molecules has a bent structure?A. O2
B. CO2
C. H2O
D. CH4

Answers

Answer : The correct option is, (C) $H_2O$

Explanation :

Formula used:

$\text{Number of electrons}=(1)/(2)[V+N-C+A]$

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

First we have to determine the hybridization of the following molecules.

(a) $O_2$

This is diatomic molecule and diatomic molecules always form linear shape.

(b) $CO_2$

$\text{Number of electrons}=(1)/(2)* [4]=2$

The number of electrons is 2 that means the hybridization will be $sp$ and the electronic geometry of the molecule will be linear.

(c) $H_2O$

$\text{Number of electrons}=(1)/(2)* [6+2]=4$

The number of electrons is 4 that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

But as there are two atoms around the central oxygen atom, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent.

(d) $CH_4$

$\text{Number of electrons}=(1)/(2)* [4+4]=4$

The number of electrons is 4 that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

Hence, the molecule has bent structure will be, $H_2O$

H2O has a bent structure. The oxygen atom is in the center, and the hydrogen atoms are attached but pointing downward. It's not linear because there are two unshared pairs of electrons on oxygen that take up their own spaces.

A compound is broken down by chemical means during (1) chromatography
(2) distillation
(3) electrolysis
(4) filtration

Answers

Answer : Option 3) Electrolysis.

Explanation : In the process of electrolysis, decomposition of the chemical is done by passing the electric current from the liquid or the solution containing ions in it. This is the process where compound is broken into ions namely, cations and anions.

Rest all options does not involves chemical decomposition of the compound.

Chromatography is a technique where rates of solute and solvent are compared in a medium where the solute components move at different rates and the separation is obtained.

Distillation simply purifies the liquid or solution by heating or cooling process.

Filtration just involves removal of impurities by using a more porous material device to get purified compound.

Answer:

The correct answer is option (3).

Explanation:

Electrolysis is defined as chemical process in which decomposition is carried out by passing an electricity in a solution containing ions. For example: electrical decomposition of water gives oxygen gas and hydrogen gas.

$2H_2O(l)\overset{Electricity}\rightarrow 2H_2(g)+O_2(g)$

where as chromatography, distillation and filtration are the separation techniques used to separate the compounds from the mixtures.

Hence, the correct answer is option (3).

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