Question 1

Which of the following elements exists naturally as a diatomic molecule in its gaseous form?

Accepted Answer

Nitrogen ($$\mathrm{N}_2)$$

Question 2

Which of the following compounds is named correctly according to IUPAC rules?

Accepted Answer

Iron(II) oxide for $$\mathrm{FeO}$$

Question 3

Which of the following is the correct formula for aluminum carbonate?

Accepted Answer

$$\mathrm{Al_2$(CO_3$)_3}$$

Question 4

A student is asked to balance the following combustion reaction: $$\mathrm{C_3H_8 + O_2$ \rightarrow CO_2$ + H_2O}. $$What is the correct set of coefficients (in order: $$\mathrm{C_3H_8}$$, $$\mathrm{O_2$}$$, $$\mathrm{CO_2$}$$, $$\mathrm{H_2O}$$)?

Accepted Answer

1, 5, 3, 4

Question 5

Which of the following is evidence of a chemical reaction rather than a physical change?

Accepted Answer

Formation of a precipitate when two solutions are mixed

Question 6

What is the molar mass of $$\mathrm{H_2SO_4} ($$sulfuric acid)? (Atomic masses: H = 1, S = 32, O = 16)

Accepted Answer

$$98\ \mathrm{g/mol}$$

Question 7

Which of the following compounds is most likely to conduct electricity when dissolved in water?

Accepted Answer

$$\mathrm{NaCl} ($$sodium chloride)

Question 8

Given the empirical formula $$\mathrm{CH_2O}$$ and a molar mass of $$180\ \mathrm{g/mol}$$, what is the molecular formula?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 9

Which of the following is a correct net ionic equation for the reaction between aqueous solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$}$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 10

Which of the following best describes a redox (oxidation-reduction) reaction?

Accepted Answer

A reaction in which electrons are transferred between species

Question 11

What is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 12

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

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 13

A solution contains $$0.5$$ moles of $$\mathrm{NaCl}$$ dissolved in $$500\ \mathrm{mL} of $$water. What is the molarity of the solution?

Accepted Answer

$$1.0\ \mathrm{M}$$

Question 14

Which of the following is a correct balanced equation for the double replacement reaction between $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl}$$?

Accepted Answer

$$\mathrm{$$AgNO_3$$ (aq) + NaCl (aq) \rightarrow AgCl (s) + $$NaNO_3$$ (aq)}$$

Question 15

Which of the following is the correct empirical formula for a compound that is 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 16

Which of the following is the correct name for $$\mathrm{H_2SO_3}$$?

Accepted Answer

Sulfurous acid

Question 17

In a single replacement reaction, why is it important to have an activity series available?

Accepted Answer

To determine if the reaction will occur based on the relative reactivity of the elements

Question 18

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

Accepted Answer

$$\mathrm{N_2O_4}$$

Question 19

Which of the following is a product of an acid-base neutralization reaction between $$\mathrm{HCl}$$ and $$\mathrm{NaOH}$$?

Accepted Answer

$$\mathrm{NaCl}$$ and $$\mathrm{H_2O}$$

Introduction to Chemistry: Essential Concepts and Skills Study Guide

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