Question 1

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, while covalent bonds involve the sharing of electrons between nonmetals.

Question 2

A magnesium atom (atomic number 12) forms an ion by losing two electrons. What is the correct symbol and charge for this ion?

Accepted Answer

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

Question 3

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{KNO}_3$$

Question 4

What is the correct name for the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 5

Which of the following best explains why ionic compounds have high melting points?

Accepted Answer

They have strong electrostatic attractions between oppositely charged ions.

Question 6

What is the formula for aluminum sulfate?

Accepted Answer

$$\mathrm{Al}_2(\mathrm{SO}_4)_3$$

Question 7

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{CO}_2$$

Question 8

A molecule of ammonia ($$\mathrm{NH}_3) $$has what molecular shape according to VSEPR theory?

Accepted Answer

Trigonal pyramidal

Question 9

Which intermolecular force is the strongest in liquid water?

Accepted Answer

Hydrogen bonds

Question 10

What is the correct formula for diphosphorus pentoxide?

Accepted Answer

$$\mathrm{P}_2\mathrm{O}_5$$

Question 11

Which of the following best describes the bond in a molecule of $$\mathrm{HCl}$$?

Accepted Answer

Polar covalent

Question 12

A patient is given a medication containing potassium iodide ($$\mathrm{KI}). $$What type of compound is this?

Accepted Answer

Ionic compound

Question 13

Which of the following is the correct Lewis structure for methane ($$\mathrm{CH}_4$$)?

Accepted Answer

A central C atom with four single bonds to four H atoms, and no lone pairs on C.

Question 14

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

Accepted Answer

Electronegativity increases from left to right.

Question 15

What is the main intermolecular force present in solid iodine ($$\mathrm{I}_2$$)?

Accepted Answer

Dispersion forces

Question 16

Which of the following is the correct name for $$\mathrm{N}_2\mathrm{O}_4$$?

Accepted Answer

Dinitrogen tetroxide

Question 17

A solution contains $$\mathrm{CaCl}_2. $$Which ions are present when it dissolves in water?

Accepted Answer

$$\mathrm{Ca}^{2+}$$ and $$2\ \mathrm{Cl}^-$$

Question 18

Which of the following best explains why water ($$\mathrm{H}_2\mathrm{O}) is a $$polar molecule?

Accepted Answer

It has polar bonds and a bent molecular shape, so the dipoles do not cancel.

Question 19

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$(\mathrm{NH}_4)_2\mathrm{SO}_4$$

Question 20

Which of the following statements about the octet rule is correct?

Accepted Answer

Hydrogen is stable with two electrons in its valence shell.

Chapter 6: Ionic and Molecular Compounds – GOB Chemistry Study Notes

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