Question 1

Which of the following statements best distinguishes a compound from a mixture?

Accepted Answer

A compound has elements combined in fixed, definite proportions, while a mixture can have elements in any proportion.

Question 2

Which of the following is the correct empirical formula for glucose, whose molecular formula is $$\mathrm{C_6H_{12}O_6$}$$?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 3

Which of the following best describes the bonding in sodium chloride ($$\mathrm{NaCl}$$)?

Accepted Answer

Ionic bonds formed by the transfer of electrons from sodium to chlorine

Question 4

Which of the following is a molecular element?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 5

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 6

Which of the following compounds is an example of a hydrate?

Accepted Answer

$$\mathrm{$$CuSO_4$$ \cdot 5H_2O}$$

Question 7

A sample of a compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 8

Which of the following is the correct name for $$\mathrm{K_2SO_4}$$?

Accepted Answer

Potassium sulfate

Question 9

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

Accepted Answer

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

Question 10

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N_2O_4}$$

Question 11

Which of the following is a polyatomic ion?

Accepted Answer

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

Question 12

What is the correct name for $$\mathrm{H_2SO_4}$$ when dissolved in water?

Accepted Answer

Sulfuric acid

Question 13

Which of the following best describes the difference between an empirical formula and a molecular formula?

Accepted Answer

The empirical formula shows the simplest whole-number ratio of atoms, while the molecular formula shows the actual number of atoms in a molecule.

Question 14

A 10.0 g sample of a compound contains 2.0 g of hydrogen and 8.0 g of oxygen. What is the mass percent of hydrogen in the compound?

Accepted Answer

$$20\%$$

Question 15

Which of the following is the correct name for $$\mathrm{$$CuSO_4$$ \cdot 5H_2O}$$?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 16

Which of the following is a binary acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl})$$

Question 17

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 18

A compound is found to have a molar mass of $$58.44\ \mathrm{g/mol}$$ and an empirical formula of $$\mathrm{NaCl}. $$What is its molecular formula?

Accepted Answer

$$\mathrm{NaCl}$$

Question 19

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

Accepted Answer

Dinitrogen pentoxide

Question 20

Which of the following best describes a hydrocarbon?

Accepted Answer

A compound containing only carbon and hydrogen

Chapter 3: Molecules and Compounds – General Chemistry Study Notes

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