Question 1

Which of the following best describes the reaction shown in the first image (purple vapor forming from a white solid)?

Accepted Answer

A decomposition reaction where a single compound breaks down into two or more products, one of which is a purple gas.

Question 2

A test tube containing a white solid is heated and a colorless gas is released, as shown in the second image. What type of reaction is this, and what is a likely identity for the gas?

Accepted Answer

Decomposition reaction; the gas is likely water vapor ($$\mathrm{H_2O}).$$

Question 3

A balloon filled with hydrogen gas is ignited, resulting in a large flame as shown in the third image. Which type of reaction is occurring?

Accepted Answer

Combustion reaction: $$2\mathrm{H_2$}(g) + \mathrm{O_2$}(g) \rightarrow 2\mathrm{H_2O}(g)$$

Question 4

The fourth image shows a solid reacting with a solution to produce bubbles. Which reaction type and products are most likely?

Accepted Answer

Gas-forming reaction: $$\mathrm{$$CaCO_3$$}(s) + 2\mathrm{HCl}(aq) \rightarrow \mathrm{$$CaCl_2$$}(aq) + \mathrm{H_2O}(l) + \mathrm{CO_2$}(g)$$

Question 5

Given the reaction: $$2\mathrm{$$HNO_3$$}(aq) + \mathrm{Ca(OH)_2}(s) \rightarrow 2\mathrm{H_2O}(l) + \mathrm{Ca(NO_3$)_2}(aq)$$, what type of reaction is this?

Accepted Answer

Double displacement (acid–base neutralization) reaction

Question 6

Which of the following best describes what happens when sodium chloride dissolves in water, as shown in the sixth image?

Accepted Answer

The $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions become hydrated and are surrounded by water molecules.

Question 7

Which statement is true about the solution in the seventh image, where a light bulb is glowing?

Accepted Answer

The solution contains a strong electrolyte, allowing it to conduct electricity.

Question 8

According to the solubility rules shown in the eighth image, which compound is insoluble in water?

Accepted Answer

AgCl

Question 9

Which of the following is a correct net ionic equation for the precipitation reaction between sodium sulfide and chromium(III) acetate, as shown in the tenth image?

Accepted Answer

$$3\mathrm{S$$^{2-}$$}(aq) + 2\mathrm{Cr$$^{3+}$$}(aq) \rightarrow \mathrm{Cr_2S_3}(s)$$

Question 10

Which of the following acids is classified as a strong acid according to the table of important acids?

Accepted Answer

$$HNO_3 ($$Nitric acid)

Question 11

What is the net ionic equation for the reaction between potassium hydroxide and phosphoric acid, as shown in the fifteenth image?

Accepted Answer

$$3\mathrm{OH^-}(aq) + \mathrm{H_3PO_4}(aq) \rightarrow 3\mathrm{H_2O}(l) + \mathrm{PO_4$^{3-}}(aq)$$

Question 12

Which of the following is the correct net ionic equation for the reaction between hydriodic acid and zinc carbonate, as shown in the eighteenth image?

Accepted Answer

$$2\mathrm{H^+}(aq) + \mathrm{$$ZnCO_3$$}(s) \rightarrow \mathrm{Zn$$^{2+}$$}(aq) + \mathrm{H_2O}(l) + \mathrm{CO_2$}(g)$$

Question 13

In the redox reaction $$\mathrm{Zn}(s) + \mathrm{Cu$$^{2+}$$}(aq) \rightarrow \mathrm{Zn$$^{2+}$$}(aq) + \mathrm{Cu}(s)$$, which species is oxidized and which is reduced?

Accepted Answer

Zn is oxidized, Cu$$^{2+} is $$reduced.

Question 14

Which of the following best describes a strong electrolyte?

Accepted Answer

A compound that dissociates completely into ions in aqueous solution.

Question 15

Which of the following is a correct statement about oxidation numbers?

Accepted Answer

The sum of the oxidation numbers in a neutral compound is zero.

Question 16

A solution is prepared by dissolving 5.00 g of NiCl$$_2$$·6H$$_2O in $$enough water to make 250.0 mL of solution. What is the molarity of the solution? (Molar mass NiCl$$_2$$·6H$$_2O = 237.7 g/$$mol)

Accepted Answer

$$0.0840\ \mathrm{M}$$

Question 17

Which of the following best describes what happens during an acid–base titration at the equivalence point?

Accepted Answer

The moles of $$\mathrm{H_3O^+}$$ equal the moles of $$\mathrm{OH^-}.$$

Chapter 9: Chemical Reactions and Solution Stoichiometry – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard