$$CH_4(g) + 2O_2(g$$) \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

Which of the following is an example of a decomposition reaction?

Accepted Answer

$$2HgO(s) \rightarrow 2Hg(l) + O_2$(g)$$

Question 3

What is the correct classification for the following reaction? $$Fe(s) + $$CuSO_4$$(aq) \rightarrow $$FeSO_4$$(aq) + Cu(s)$$

Accepted Answer

Single displacement

Question 4

Which of the following reactions is a combustion reaction?

Accepted Answer

$$CH_4(g) + 2O_2(g$$) ightarrow $$CO_2(g) + 2H_2O(g$$) + 	ext{energy}$$

Question 5

Which of the following best describes a double displacement (double replacement) reaction?

Accepted Answer

Two compounds exchange ions to form two new compounds.

Question 6

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

Accepted Answer

Decomposition

Question 7

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

Accepted Answer

Iron nail placed in copper(II) sulfate solution forming copper metal

Question 8

What is the balanced equation for the combustion of glucose ($$C_6H_{12}O_6$)?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O$$

Question 9

Which of the following statements about pattern recognition in chemistry is TRUE?

Accepted Answer

Recognizing patterns helps classify concepts and develop predictive models.

Question 10

A reaction is observed where $$AgNO_3(aq$$)$$ reacts with $$NaCl(aq)$$ to form $$AgCl(s)$$ and $$NaNO_3$$(aq). $$What type of reaction is this?

Accepted Answer

Double displacement

Question 11

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

Accepted Answer

A single product is formed from two reactants.

Question 12

Which equation represents a synthesis reaction?

Accepted Answer

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

Question 13

Which of the following best describes the products of a decomposition reaction?

Accepted Answer

Two or more products are formed from a single reactant.

Question 14

Which of the following reactions is an example of a double displacement reaction?

Accepted Answer

$$NaOH(aq) + HCl(aq) \rightarrow NaCl(aq) + H_2O(l)$$

Question 15

A student mixes $$BaCl_2(aq$$)$$ and Na_2SO_4(aq$$)$$ and observes a white precipitate. What type of reaction has occurred?

Accepted Answer

Double displacement

Question 16

Which of the following is a correct balanced equation for a single displacement reaction?

Accepted Answer

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

Question 17

Which of the following best explains why recognizing reaction patterns is important in chemistry?

Accepted Answer

It allows chemists to predict the products of reactions.

Question 18

Which of the following is NOT a type of reaction discussed in the study materials?

Accepted Answer

Neutralization

Question 19

A reaction is observed where $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$. What type of reaction is this?

Accepted Answer

Synthesis (Combination)

Question 20

Which of the following is a real-life application of a decomposition reaction?

Accepted Answer

Electrolysis of water to produce hydrogen and oxygen gases

Types of Chemical Reactions: Patterns and Classification

Study Guide - Practice Questions