Question 1

Which of the following statements best explains why elements in the same group of the periodic table have similar chemical properties?

Accepted Answer

They have the same valence-shell electron configuration.

Question 2

According to the octet rule, which of the following ions is most likely to form from a Group 2A element?

Accepted Answer

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

Question 3

Which of the following correctly matches the polyatomic ion with its formula?

Accepted Answer

Nitrate: $$\mathrm{NO}_3^-$$

Question 4

A neutral atom of nitrogen typically forms how many covalent bonds in a molecule, and why?

Accepted Answer

Three, because it has five valence electrons and needs three more to complete its octet.

Question 5

Which of the following best describes the shape and bond angles of methane ($$\mathrm{CH}_4) $$according to the VSEPR model?

Accepted Answer

Tetrahedral, with bond angles of $$109.5^\circ$$

Question 6

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

Accepted Answer

$$\mathrm{CO}_2$$

Question 7

How many moles of glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6) $$are present in $$180$$ grams of glucose? (Atomic masses: C = 12, H = 1, O = 16)

Accepted Answer

1 mole

Question 8

Which of the following best describes electronegativity?

Accepted Answer

The ability of an atom to attract electrons in a chemical bond.

Question 9

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of water. How many moles of water does this represent?

Accepted Answer

0.5 moles

Question 10

Which of the following ions is a cation?

Accepted Answer

$$\mathrm{Na}^+$$

Question 11

What is the total number of valence electrons in a molecule of ammonia ($$\mathrm{NH}_3$$)?

Accepted Answer

10

Question 12

Which of the following best explains why hydrocarbons are insoluble in water?

Accepted Answer

Hydrocarbons are nonpolar and water is polar, so they do not mix.

Question 13

Which of the following is the correct name for $$\mathrm{Fe}_2\mathrm{O}_3$$?

Accepted Answer

Iron(III) oxide

Question 14

How many electrons are shared in a triple covalent bond?

Accepted Answer

6

Question 15

Which of the following statements about the energy levels of electron shells is correct?

Accepted Answer

Each successive electron shell is at a higher, discrete energy level.

Question 16

What is the formula weight (in amu) of carbon dioxide ($$\mathrm{CO}_2$$)? (C = 12, O = 16)

Accepted Answer

44 amu

Question 17

Which of the following best describes the shape of water ($$\mathrm{H}_2\mathrm{O}) $$and its bond angle?

Accepted Answer

Bent, $$104.5^\circ$$

Question 18

Which of the following is a correct statement about polyatomic ions?

Accepted Answer

They are groups of covalently-bonded atoms that carry a charge.

Question 19

If the electronegativity difference between two atoms is $$2.1$$, what type of bond will most likely form?

Accepted Answer

Ionic

Question 20

How many chloride ions are needed to balance the charge of one aluminum ion ($$\mathrm{Al}^{3+}) in an $$ionic compound?

Accepted Answer

3

Chapter 3 Study Guide: Compounds and Chemical Bonding

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