Question 1

Which of the following best describes what is happening in the reaction: $$2Mg(s) + O_2$(g) \rightarrow 2MgO(s)$$?

Accepted Answer

Magnesium is being oxidized and oxygen is being reduced.

Question 2

A student mixes solutions of barium nitrate and sodium sulfate. A white solid forms. What is the net ionic equation for this reaction?

Accepted Answer

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

Question 3

Which of the following is a clue that a chemical change has occurred?

Accepted Answer

A gas is produced and bubbles are observed.

Question 4

Which of the following compounds is always soluble in water?

Accepted Answer

$$NaNO_3$$

Question 5

What is the balanced net ionic equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$H^+(aq) + OH^-(aq) \rightarrow H_2O(l)$$

Question 6

Which of the following best explains why pure water is a poor conductor of electricity?

Accepted Answer

Water molecules do not dissociate into ions significantly.

Question 7

A solution of silver nitrate is added to a solution of sodium chloride. What is the precipitate formed?

Accepted Answer

AgCl

Question 8

Which of the following is the correct net ionic equation for the reaction between sulfurous acid and lithium hydroxide?

Accepted Answer

$$H_2SO_3(aq) + 2OH^-(aq) \rightarrow 2H_2O(l) + SO_3$^{2-}(aq)$$

Question 9

Which of the following best describes a catalyst in a chemical reaction?

Accepted Answer

It speeds up the reaction by lowering the activation energy and is not used up.

Question 10

Which of the following is the correct balanced equation for the combustion of hexane ($$C_6H_{14}$$)?

Accepted Answer

$$C_6H_{14}(l) + 9.5O_2(g) \rightarrow 6CO_2(g) + 7H_2O(g)$$

Question 11

Which of the following is a strong acid?

Accepted Answer

$$HNO_3$$

Question 12

A student is performing a titration and adds 15.8 mL of 0.26 M NaOH to neutralize 12.8 mL of $$H_2SO_4. $$What is the concentration of the sulfuric acid?

Accepted Answer

$$0.16\ M$$

Question 13

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between species.

Question 14

Which of the following is the correct net ionic equation for the reaction between sodium bicarbonate and hydrochloric acid?

Accepted Answer

$$HCO_3^-(aq) + H^+(aq$$) \rightarrow $$CO_2(g) + H_2O(l$$)$$

Question 15

Which of the following best explains why $$KNO_3 is $$more soluble in water than $$LiNO_3$$?

Accepted Answer

Potassium has a larger atomic radius, resulting in less force between ions according to Coulomb's Law.

Question 16

Which of the following is the correct net ionic equation for the reaction between iron(II) chloride and acidified sodium dichromate?

Accepted Answer

$$6Fe^{2+}(aq) + Cr_2O$$_$$7^{2-}(aq) + 14H^+(aq$$) \rightarrow $$2Cr^{3+}(aq$$) + $$6Fe^{3+}(aq) + 7H_2O(l$$)$$

Question 17

Which of the following is a correct statement about double replacement reactions?

Accepted Answer

They always produce a precipitate or water.

Question 18

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

Accepted Answer

$$Na_2Cr_2O_7$$

Comprehensive Study Guide: Chemical Reactions, Types, and Solution Chemistry for GOB Chemistry

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