Burning of methane in a gas stove: $$CH_4(g) + 2O_2(g$$) \rightarrow $$CO_2(g) + 2H_2O(g$$) + \text{energy}$$

Question 1

Which of the following best describes a synthesis (combination) reaction?

Accepted Answer

Two or more reactants combine to form a single product.

Question 2

Given the reaction $$2KClO_3(s) \rightarrow 2KCl(s) + 3O_2(g)$$, what type of reaction is this?

Accepted Answer

Decomposition

Question 3

Which of the following is a real-world example of a combustion reaction?

Accepted Answer

Burning of methane in a gas stove: $$CH_4(g) + 2O_2(g$$) ightarrow $$CO_2(g) + 2H_2O(g$$) + 	ext{energy}$$

Question 4

What is the balanced equation for the reaction between zinc and hydrochloric acid, and what type of reaction is it?

Accepted Answer

$$Zn(s) + 2HCl(aq) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)$$; Single Displacement

Question 5

Which of the following reactions is a double displacement reaction?

Accepted Answer

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

Question 6

A student mixes aqueous solutions of sodium hydroxide and hydrochloric acid. What type of reaction occurs and what are the products?

Accepted Answer

Double displacement; $$NaCl(aq)$$ and $$H_2O(l)$$

Question 7

Which of the following is NOT a characteristic of a decomposition reaction?

Accepted Answer

Two or more reactants combine to form a single product.

Question 8

Identify the type of reaction: $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$

Accepted Answer

Synthesis (Combination)

Question 9

Which of the following equations represents a single displacement reaction?

Accepted Answer

$$Fe(s) + $$CuSO_4$$(aq) \rightarrow $$FeSO_4$$(aq) + Cu(s)$$

Question 10

A chemical reaction produces a precipitate when two aqueous solutions are mixed. Which type of reaction is this most likely to be?

Accepted Answer

Double displacement

Question 11

Which of the following is a key benefit of recognizing patterns in chemical reactivity?

Accepted Answer

It helps classify concepts for easier understanding and faster learning.

Question 12

Which equation is correctly balanced for the combustion of methane?

Accepted Answer

$$CH_4(g) + 2O_2(g$$) \rightarrow $$CO_2(g) + 2H_2O(g$$)$$

Question 13

Which of the following reactions is an example of a decomposition reaction used in real-world applications?

Accepted Answer

Electrolysis of water: $$2H_2O(l) \rightarrow 2H_2(g) + O_2$(g)$$

Question 14

A reaction is classified as double displacement if:

Accepted Answer

Two elements or groups in different compounds exchange places.

Question 15

Which of the following best describes the products of a combustion reaction involving a hydrocarbon?

Accepted Answer

Carbon dioxide and water

Question 16

What is the main difference between single displacement and double displacement reactions?

Accepted Answer

Single displacement involves one element replacing another; double displacement involves two compounds exchanging ions.

Question 17

Which of the following reactions is a synthesis reaction relevant to industrial ammonia production?

Accepted Answer

$$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$

Question 18

Which of the following is a correct example of a single displacement reaction that occurs in the human body?

Accepted Answer

Iron displacing copper in blood chemistry: $$Fe(s) + $$CuSO_4$$(aq) \rightarrow $$FeSO_4$$(aq) + Cu(s)$$

Question 19

Which of the following reactions would be classified as a synthesis reaction?

Accepted Answer

$$2Mg(s) + O_2$(g) \rightarrow 2MgO(s)$$

Types of Chemical Reactions: Patterns, Classification, and Practice

Study Guide - Practice Questions