Question 1

Which statement best describes the Law of Constant Composition?

Accepted Answer

A compound always contains the same elements in the same proportion by mass.

Question 2

Given the formula $$\mathrm{Na_2SO_4}$$, how many atoms of sodium are present in one formula unit?

Accepted Answer

2

Question 3

Which of the following is the correct empirical formula for a compound containing 63.15% C, 3.56% H, and 33.15% O by mass? (Molar masses: C = 12.01 g/mol, H = 1.008 g/mol, O = 16.00 g/mol)

Accepted Answer

$$\mathrm{C_2H_2O}$$

Question 4

What is the molar mass of $$\mathrm{Na_2SO_4}$$?

Accepted Answer

$$142.04\ \mathrm{g/mol}$$

Question 5

How many moles are present in $$6.25 	imes 10$$^{21}$$ formula units of $$\mathrm{Na_2SO_4}$$?

Accepted Answer

$$0.0104\ \mathrm{mol}$$

Question 6

If you have $$50.0\ \mathrm{g} of$$ $$\mathrm{Na_2SO_4}$$, how many grams of sodium can be extracted?

Accepted Answer

$$16.2\ \mathrm{g}$$

Question 7

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 8

What is the correct name for $$\mathrm{$$MgSO_4$$}$$?

Accepted Answer

Magnesium sulfate

Question 9

Which of the following is the correct balanced equation for the reaction of iron(III) chloride with aluminum wire?

Accepted Answer

$$2\mathrm{Al} + 3\mathrm{$$FeCl_3$$} \rightarrow 2\mathrm{$$AlCl_3$$} + 3\mathrm{Fe}$$

Question 10

What type of reaction occurs when calcium nitrate reacts with sodium hydroxide?

Accepted Answer

Double displacement

Question 11

Which of the following is the net ionic equation for the reaction between calcium nitrate and sodium hydroxide?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$ (aq) + 2OH^- (aq) \rightarrow Ca(OH)_2 (s)}$$

Question 12

Which of the following is the correct molecular formula for a compound with an empirical formula of $$\mathrm{C_2H_2O}$$ and a molar mass of $$456\ \mathrm{g/mol}$$?

Accepted Answer

$$\mathrm{C$$_{24}$$H_{24}O$$_{12}}$

Question 13

Which of the following is a correct representation of a chemical formula for a polyatomic ion?

Accepted Answer

$$\mathrm{PO_4$^{3-}}$$

Question 14

What is the total number of atoms in one formula unit of $$\mathrm{Al_2$(SO_4$)_3}$$?

Accepted Answer

17

Question 15

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

Accepted Answer

Potassium chloride

Question 16

Which of the following is the correct formula for iron(III) phosphate?

Accepted Answer

$$\mathrm{$$FePO_4$$}$$

Question 17

Which of the following is the correct balanced equation for the combustion of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

$$\mathrm{CH_4$ + 2O_2 \rightarrow CO_2$ + 2H_2O}$$

Question 18

Which of the following is a combination reaction?

Accepted Answer

$$\mathrm{2H_2 + O_2$ \rightarrow 2H_2O}$$

Fundamental Concepts in Introduction to Chemistry: Composition, Formulas, and Chemical Reactions

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