Question 1

Which of the following best describes the difference between a mixture and a compound?

Accepted Answer

A mixture contains elements mixed in any proportion, while a compound contains elements combined in fixed, whole-number ratios.

Question 2

Which of the following substances is an ionic compound?

Accepted Answer

SrI\_2

Question 3

What is the empirical formula for hydrogen peroxide (H\_2O\_2)?

Accepted Answer

$$\mathrm{HO}$$

Question 4

Which statement correctly describes the bonding in sodium chloride (NaCl)?

Accepted Answer

NaCl is held together by electrostatic attraction between oppositely charged ions.

Question 5

Which of the following is the correct name for Fe\_2O\_3?

Accepted Answer

Iron(III) oxide

Question 6

A compound contains 75.69% C, 8.80% H, and 15.51% O by mass. What is its empirical formula?

Accepted Answer

Question 7

Which of the following is a polyatomic ion?

Accepted Answer

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

Question 8

What is the correct name for MgSO\_4 \cdot 7H\_2O?

Accepted Answer

Magnesium sulfate heptahydrate

Question 9

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

Accepted Answer

$$\mathrm{$$NaNO_2$$}$$

Question 10

Which prefix is used to indicate six water molecules in a hydrate?

Accepted Answer

hexa-

Question 11

What is the formula mass of water ($$\mathrm{H_2O}$$)?

Accepted Answer

$$18.02\ \mathrm{g/mol}$$

Question 12

Which of the following is the correct name for HCl (aq)?

Accepted Answer

Hydrochloric acid

Question 13

Which of the following is a molecular element?

Accepted Answer

O\_2

Question 14

What is the correct name for CuO?

Accepted Answer

Copper(II) oxide

Question 15

Which of the following is the correct formula for barium chloride hexahydrate?

Accepted Answer

$$\mathrm{$$BaCl_2$$ \cdot 6H_2O}$$

Question 16

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 17

Which of the following is the correct formula for perchlorate ion?

Accepted Answer

$$\mathrm{$$ClO_4$$^-}$$

Question 18

A compound has the empirical formula CH and a molar mass of 78.11 g/mol. What is its molecular formula?

Accepted Answer

$$\mathrm{C_6H_6}$$

Question 19

Which of the following is the correct name for $$\mathrm{$$CrBr_3$$}$$?

Accepted Answer

Chromium(III) bromide

Question 20

Which of the following is a correct statement about organic compounds?

Accepted Answer

Organic compounds are mainly made of carbon and hydrogen, but may also contain O, N, P, S, and other elements.

Chapter 3: Molecules, Compounds, and Chemical Equations – General Chemistry 1101 Study Notes

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