Question 1

Which of the following statements best explains why sodium chloride conducts electricity when dissolved in water?

Accepted Answer

Water molecules break the ionic bonds, allowing free movement of ions.

Question 2

What is the electron configuration of a magnesium ion ($$\mathrm{Mg$$^{2+}$$}) $$after it has formed from a neutral magnesium atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 3

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

Accepted Answer

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

Question 4

According to the octet rule, what charge will a group 6A element most likely have when it forms an ion?

Accepted Answer

$$-2$$

Question 5

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation has lost electrons and is positively charged; an anion has gained electrons and is negatively charged.

Question 6

What is the formula for the ionic compound formed between calcium ions and nitrate ions?

Accepted Answer

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

Question 7

Which of the following is the correct name for $$\mathrm{$$FeCl_3$$}$$ using the modern (Roman numeral) system?

Accepted Answer

Iron(III) chloride

Question 8

Which property is NOT typical of ionic compounds?

Accepted Answer

They conduct electricity in solid form.

Question 9

What is the charge on the phosphate ion?

Accepted Answer

$$-3$$

Question 10

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{Na_2SO_4}$$

Question 11

A solution of potassium chloride ($$\mathrm{KCl}) in $$water lights a bulb in a conductivity test. What is the best explanation for this observation?

Accepted Answer

Potassium and chloride ions move freely in solution, allowing electric current to flow.

Question 12

Which of the following ions is NOT likely to form based on the octet rule and periodic trends?

Accepted Answer

$$\mathrm{Si$$^{2+}$$}$$

Question 13

What is the formula unit for magnesium phosphate?

Accepted Answer

$$\mathrm{Mg_3$(PO_4$)_2}$$

Question 14

Which of the following best describes the process of ionic bond formation?

Accepted Answer

Electrons are transferred from a metal to a nonmetal, resulting in oppositely charged ions that attract each other.

Question 15

Which of the following is the correct formula for the compound formed between aluminum ions and sulfate ions?

Accepted Answer

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

Question 16

Which of the following acids can provide three $$\mathrm{H^+}$$ ions per molecule?

Accepted Answer

Phosphoric acid ($$\mathrm{H_3PO_4})$$

Question 17

Which of the following is the correct name for $$\mathrm{Cu^+}$$ using the old naming system?

Accepted Answer

Cuprous ion

Question 18

If a compound contains $$\mathrm{Ba$$^{2+}$$}$$ and $$\mathrm{OH^-}$$ ions, what is its correct formula?

Accepted Answer

$$\mathrm{Ba(OH)_2}$$

Question 19

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

Accepted Answer

The rigid arrangement of oppositely charged ions is disrupted, causing repulsion between like charges.

Ionic Compounds: Structure, Formation, and Properties (GOB Chemistry Chapter 3 Study Notes)

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