Question 1

Which of the following statements best explains why sodium chloride (NaCl) conducts electricity when dissolved in water, but not as a solid?

Accepted Answer

In solid NaCl, ions are held rigidly in place and cannot move, but when dissolved in water, the ions are free to move and carry electric current.

Question 2

A magnesium atom (Z=12) forms an ion by losing electrons. What is the electron configuration of the resulting ion, and what is its charge?

Accepted Answer

The ion has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$ and a charge of $$+2.$$

Question 3

Which of the following ions is most likely to form from a nitrogen atom (Z=7)?

Accepted Answer

$$\mathrm{N}^{3-}$$

Question 4

According to the octet rule, what is the most likely charge on an ion formed by a group 6A element such as sulfur?

Accepted Answer

$$-2$$

Question 5

Which of the following best describes the trend in ionization energy across a period in the periodic table?

Accepted Answer

Ionization energy increases from left to right across a period.

Question 6

Which of the following formulas represents the ionic compound formed between calcium ions and nitrate ions?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 7

What is the correct name for the compound $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 8

Which of the following is a property of ionic compounds that distinguishes them from covalent compounds?

Accepted Answer

They have high melting and boiling points due to strong electrostatic forces between ions.

Question 9

A patient is given a solution of potassium chloride (KCl) intravenously. Which ions are present in the solution, and why is the solution able to conduct electricity?

Accepted Answer

The solution contains $$\mathrm{K^+}$$ and $$\mathrm{Cl^-}$$ ions, which are free to move and carry electric current.

Question 10

Which of the following best explains why transition metals can form cations with more than one possible charge?

Accepted Answer

They can lose both valence-shell s electrons and inner-shell d electrons.

Question 11

What is the correct formula for the ionic compound formed between aluminum ions and sulfate ions?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 12

Which of the following is the correct name for $$\mathrm{$$CuCl_2$$}$$ using the modern (Stock) system?

Accepted Answer

Copper(II) chloride

Question 13

A solution contains $$\mathrm{Ba(OH)_2}. $$How many hydroxide ions are released per formula unit when it dissolves in water?

Accepted Answer

2

Question 14

Which of the following best describes the process by which a chlorine atom becomes a chloride ion?

Accepted Answer

It gains one electron to achieve a noble gas configuration.

Question 15

Which of the following is the correct formula for sodium phosphate?

Accepted Answer

$$\mathrm{Na_3PO_4}$$

Question 16

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 17

A sample of sulfuric acid ($$\mathrm{H_2SO_4}) is $$dissolved in water. How many $$\mathrm{H^+}$$ ions can each molecule of sulfuric acid provide?

Accepted Answer

2

Question 18

Which of the following best explains why ionic solids shatter when struck sharply?

Accepted Answer

Striking the solid forces like-charged ions next to each other, causing strong repulsion and the crystal to break.

Question 19

Which of the following is the correct name for $$\mathrm{K_2SO_4}$$?

Accepted Answer

Potassium sulfate

Chapter 3: Ionic Compounds – Structured Study Notes for GOB Chemistry

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