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AP Chemistry Practice Quiz: Types of Chemical Reactions

Written by AP Content Team, Verified for 2026 AP Exams, Last updated: July 2026

Test your understanding with short quizzes. This quiz has 12 questions to check your progress.

Question 1 of 12

According to the provided information, which type of reaction is defined by the transfer of one or more protons (H+ ions) between chemical species?

All Questions (12)

According to the provided information, which type of reaction is defined by the transfer of one or more protons (H+ ions) between chemical species?

A) Oxidation-reduction

B) Precipitation

C) Combustion

D) Acid-base

Correct Answer: D

The provided content explicitly states that 'Acid-base reactions involve transfer of one or more protons (H+ ions) between chemical species.'

A chemical reaction is observed to have changes in the oxidation numbers of several atoms. This reaction is best classified as which of the following types?

A) Acid-base

B) Oxidation-reduction

C) Precipitation

D) Double displacement

Correct Answer: B

The content states that oxidation-reduction (redox) reactions involve the transfer of electrons, 'as indicated by changes in oxidation numbers.'

In an oxidation-reduction reaction, what is the role of the species that is oxidized?

A) It gains electrons from the species that is reduced.

B) It transfers electrons to the species that is reduced.

C) It accepts a proton from an acid.

D) It forms an insoluble compound.

Correct Answer: B

The provided text specifies that in a redox reaction, 'electrons are transferred from the species that is oxidized to the species that is reduced.'

A student mixes aqueous solutions of potassium iodide (KI) and sodium nitrate (NaNO3). Based on the provided solubility rules, what is the expected outcome?

A) A precipitate of sodium iodide will form.

B) A precipitate of potassium nitrate will form.

C) No precipitate will form.

D) An acid-base reaction will occur.

Correct Answer: C

The potential products are potassium nitrate (KNO3) and sodium iodide (NaI). The provided rules state that all potassium, sodium, and nitrate salts are soluble in water. Therefore, both potential products are soluble, and no precipitate will form.

Combustion is described in the content as an important subclass of which major reaction type?

A) Acid-base

B) Precipitation

C) Oxidation-reduction

D) Synthesis

Correct Answer: C

The content directly states, 'Oxidation-reduction (redox) reactions involve transfer of one or more electrons between chemical species, as indicated by changes in oxidation numbers. Combustion is an important subclass.'

Which of the following processes is a key characteristic of a precipitation reaction?

A) The transfer of H+ ions between aqueous species.

B) A change in oxidation numbers for one or more elements.

C) The mixing of ions in aqueous solution to produce an insoluble compound.

D) The transfer of electrons from an oxidized species to a reduced species.

Correct Answer: C

The definition provided states that 'Precipitation reactions frequently involve mixing ions in aqueous solution to produce an insoluble or sparingly soluble ionic compound.' The other options describe acid-base or redox reactions.

According to the provided information, what is an effective way to identify which species is oxidized and which is reduced in a chemical reaction?

A) Observing if a precipitate is formed.

B) Determining if a proton has been transferred.

C) Assigning oxidation numbers to each of the atoms.

D) Checking if the reactants are in aqueous solution.

Correct Answer: C

The content specifies that 'Oxidation numbers may be assigned to each of the atoms in the reactants and products; this is often an effective way to identify the oxidized and reduced species.'

A reaction occurs where an insoluble solid is formed after mixing two aqueous solutions. Analysis shows that the oxidation numbers of all elements did not change. This reaction is best categorized as:

A) Oxidation-reduction only

B) Acid-base only

C) Precipitation only

D) Both precipitation and oxidation-reduction

Correct Answer: C

The formation of an insoluble solid from aqueous solutions defines a precipitation reaction. The fact that oxidation numbers did not change rules out an oxidation-reduction reaction.

Based on the provided solubility rules, which of the following compounds is expected to be soluble in water?

A) Ammonium carbonate

B) Lead(II) chloride

C) Silver bromide

D) Calcium sulfate

Correct Answer: A

The content explicitly states that 'All... ammonium... salts are soluble in water.' Ammonium carbonate is an ammonium salt and is therefore soluble.

In a redox reaction, an atom's oxidation number changes from +3 to +1. This indicates that the atom has:

A) been oxidized by losing electrons.

B) been reduced by gaining electrons.

C) been oxidized by gaining electrons.

D) been reduced by losing electrons.

Correct Answer: B

A decrease in oxidation number signifies reduction. According to the provided content, the species that is reduced is the one that receives electrons from the species that is oxidized. Gaining negatively charged electrons causes the oxidation number to decrease.

Which of the following pairs of aqueous solutions, when mixed, is most likely to form a precipitate?

A) Sodium chloride and potassium nitrate

B) Ammonium sulfate and sodium nitrate

C) Potassium hydroxide and sodium bromide

D) Lead(II) nitrate and sodium chloride

Correct Answer: D

This question requires using the provided rules to eliminate choices. Options A, B, and C will produce only sodium, potassium, ammonium, and nitrate salts, all of which are stated to be soluble. In option D, one product is sodium nitrate (soluble), but the other is lead(II) chloride. Since the other three options are guaranteed to produce no precipitate based on the rules, this is the only pair that can form one.

A reaction is classified as acid-base. What fundamental particle is transferred between the reactants?

A) An electron

B) A neutron

C) A proton

D) A cation

Correct Answer: C

The content defines acid-base reactions as those that 'involve transfer of one or more protons (H+ ions) between chemical species.' A proton is the fundamental particle being transferred.