Q: What is the electron configuration for Mn$^{2+}$?

$1s^2 2s^2 2p^6 3s^2 3p^6 3d^5$

Q: Which of the following best describes the trend in ionic radii across a period?

Cations decrease in radius, then an abrupt increase at anions, followed by a decrease.

Q: Which of the following is true about the formation of a coordinate covalent bond?

Both electrons in the bond are donated by one atom.

Q: A double bond in a covalent molecule consists of:

Two pairs of electrons shared between two atoms.

Q: Which of the following best describes the relationship between ionic charge and melting point in ionic compounds?

Higher ionic charge generally leads to a higher melting point.

Question 1

Which of the following statements best explains why molten salts and aqueous solutions of salts are electrically conducting?

Accepted Answer

Because the ions are free to move, allowing the flow of electric current.

Question 2

An ionic bond is formed by which of the following processes?

Accepted Answer

Electrostatic attraction between positive and negative ions.

Question 3

Given the electron configuration for Na: $[Ne]3s^1$, what is the electron configuration for the Na$^+$ ion?

Accepted Answer

$[Ne]$

Question 4

Which of the following best describes the Lewis electron-dot symbol for the chloride ion, Cl$^-$?

Accepted Answer

Eight dots surrounding the Cl symbol, representing a filled valence shell.

Question 5

Which step in the Born-Haber cycle for NaCl formation involves the energy required to remove an electron from sodium?

Accepted Answer

Ionization of sodium.

Question 6

According to Coulomb's Law, which change will most increase the strength of an ionic bond?

Accepted Answer

Increasing the ionic charges and decreasing the distance between ions.

Question 7

Given the following ions: Sr$^{2+}$, Br$^-$, Se$^{2-}$, which is the correct order of increasing ionic radius?

Accepted Answer

Sr$^{2+}$ < Br$^-$ < Se$^{2-}$

Question 8

Which of the following ions is isoelectronic with Ne?

Accepted Answer

Na$^+$

Question 9

What is the electron configuration for Mn$^{2+}$?

Accepted Answer

$1s^2 2s^2 2p^6 3s^2 3p^6 3d^5$

Question 10

Which of the following best describes the trend in ionic radii across a period?

Accepted Answer

Cations decrease in radius, then an abrupt increase at anions, followed by a decrease.

Question 11

Which of the following is true about the formation of a coordinate covalent bond?

Accepted Answer

Both electrons in the bond are donated by one atom.

Question 12

Which of the following is an exception to the octet rule?

Accepted Answer

Hydrogen

Question 13

A double bond in a covalent molecule consists of:

Accepted Answer

Two pairs of electrons shared between two atoms.

Question 14

Which of the following ions would you expect to see in chemical compounds, based on their electron configuration?

Accepted Answer

Fe$^{2+}$: $[Ar]3d^6$

Question 15

Which of the following best describes the relationship between ionic charge and melting point in ionic compounds?

Accepted Answer

Higher ionic charge generally leads to a higher melting point.

Question 16

Using Coulomb's Law, calculate the potential energy between a Na$^+$ and Cl$^-$ ion separated by $2.82 	imes 10^{-10}$ m. Use $e = 1.602 	imes 10^{-19}$ C and $k = 8.99 	imes 10^9$ J·m/C$^2$.

Accepted Answer

$-8.18 	imes 10^{-19}$ J

Question 17

Which of the following best describes the process used to determine lattice energy indirectly from other thermochemical reactions?

Accepted Answer

Born-Haber cycle

Question 18

Which of the following ions is always larger than its neutral atom?

Accepted Answer

Anion

Question 19

Which of the following ions has the smallest ionic radius among F$^-$, Mg$^{2+}$, and O$^{2-}$?

Accepted Answer

Mg$^{2+}$

Chemical Bonding: Ionic and Covalent Bonds, Electron Configurations, and Ionic Radii - Chapter 10 - Part 1

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