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

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 $$2HgO(s) \rightarrow 2Hg(l) + O_2$(g)$$, what type of chemical 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 solutions of sodium hydroxide and hydrochloric acid. Which 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 equations represents a decomposition reaction?

Accepted Answer

$$2KClO_3(s) \rightarrow 2KCl(s) + 3O_2(g)$$

Question 8

Which statement best explains the importance of recognizing patterns in chemical reactivity?

Accepted Answer

It helps classify concepts for easier understanding and prediction of chemical behavior.

Question 9

Consider the reaction: $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$. What type of reaction is this and what is a real-world application?

Accepted Answer

Synthesis; production of ammonia for fertilizers

Question 10

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

Accepted Answer

It always produces a solid product.

Question 11

A reaction is observed where $$Fe(s) is $$added to $$CuSO_4(aq$$)$$, resulting in $$FeSO_4$$(aq)$$ and $$Cu(s). $$What type of reaction is this and what is the driving force?

Accepted Answer

Single Displacement; $$Fe is $$more reactive than $$Cu$$ and replaces it.

Question 12

Which equation is correctly balanced and represents a synthesis reaction?

Accepted Answer

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

Question 13

Which of the following reactions is an example of a double displacement reaction that occurs in the human body?

Accepted Answer

Neutralization of stomach acid by antacids: $$NaOH(aq) + HCl(aq) \rightarrow NaCl(aq) + H_2O(l)$$

Question 14

Which of the following best describes a single displacement reaction?

Accepted Answer

One element replaces another in a compound.

Question 15

A student observes the reaction $$K_2CO_3(aq) \rightarrow K_2O(aq) + CO_2$(g). $$What type of reaction is this and what is a possible real-world application?

Accepted Answer

Decomposition; production of carbon dioxide in baking

Question 16

Which of the following reactions is a synthesis reaction used in industry?

Accepted Answer

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

Question 17

Which of the following is a correct example of a balanced double displacement reaction?

Accepted Answer

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

Question 18

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

Accepted Answer

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

Types of Chemical Reactions: Patterns and Classification

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