Question 1

Which of the following statements best explains why ionic compounds, such as NaCl, have high melting points?

Accepted Answer

Ionic compounds are held together by strong electrostatic attractions between oppositely charged ions.

Question 2

A pharmacy technician must prepare a solution containing magnesium chloride. What is the correct formula for magnesium chloride, and why?

Accepted Answer

MgCl2, because magnesium forms a 2+ ion and each chlorine forms a 1− ion, requiring two chlorides to balance the charge.

Question 3

Which of the following ions is isoelectronic with neon (Ne)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 4

What is the correct name for the compound FeCl3?

Accepted Answer

Iron(III) chloride

Question 5

Which of the following compounds contains a polyatomic ion?

Accepted Answer

Ca(NO3)2

Question 6

A patient is prescribed sodium sulfate as a laxative. What is the correct formula for sodium sulfate?

Accepted Answer

$$\mathrm{Na_2SO_4}$$

Question 7

Which of the following best describes the bonding in a molecule of carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

Carbon forms two double bonds with two oxygen atoms.

Question 8

Which of the following molecules is nonpolar, despite containing polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 9

What is the main type of attractive force present in liquid ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Hydrogen bonds

Question 10

Which of the following best explains why potassium iodide (KI) is added to table salt?

Accepted Answer

To prevent iodine deficiency in the diet

Question 11

Which of the following formulas represents a compound with both ionic and covalent bonds?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 12

A compound is found to have the formula $$\mathrm{N_2O_5}. $$What is its correct name?

Accepted Answer

Dinitrogen pentoxide

Question 13

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from left to right across a period and from bottom to top in a group.

Question 14

Which of the following bonds is most polar based on electronegativity differences?

Accepted Answer

$$\mathrm{O-H}$$

Question 15

What is the correct formula for aluminum phosphate?

Accepted Answer

$$\mathrm{$$AlPO_4$$}$$

Question 16

Which of the following best describes the shape of a methane ($$\mathrm{CH_4$}) $$molecule according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 17

A molecule of sulfur hexafluoride ($$\mathrm{SF_6$}) is $$used in electrical circuits. What is the correct name for this compound?

Accepted Answer

Sulfur hexafluoride

Question 18

Which of the following compounds contains a transition metal with a variable charge?

Accepted Answer

$$\mathrm{Fe_2O_3}$$

Question 19

Which of the following best describes the main attractive force in solid iodine ($$\mathrm{I_2$}$$)?

Accepted Answer

Dispersion forces

Question 20

A solution contains $$\mathrm{NH_4NO_3}. $$Which ions are present in this solution?

Accepted Answer

Ammonium and nitrate

Chapter 6: Ionic and Molecular Compounds – Study Notes

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