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 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 equations represents a decomposition reaction?

Accepted Answer

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

Question 8

Which pattern recognition skill is most important for classifying chemical reactions?

Accepted Answer

Identifying reactant and product patterns.

Question 9

In the reaction $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$, which statement is correct?

Accepted Answer

It is a synthesis reaction because two reactants combine to form a single product.

Question 10

A reaction occurs when iron metal is placed in a solution of copper(II) sulfate: $$Fe(s) + $$CuSO_4$$(aq) \rightarrow $$FeSO_4$$(aq) + Cu(s). $$What type of reaction is this?

Accepted Answer

Single Displacement

Question 11

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

Accepted Answer

It involves the exchange of ions between two compounds.

Question 12

What is the main advantage of recognizing patterns in chemical reactions?

Accepted Answer

It helps classify concepts and develop predictive models.

Question 13

Which of the following reactions is a real-life example of a double displacement reaction?

Accepted Answer

Mixing baking soda ($$NaHCO_3) $$and vinegar (CH_3COOH) to produce sodium acetate and carbonic acid.

Question 14

Which equation is correctly balanced and represents a synthesis reaction?

Accepted Answer

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

Question 15

A student observes the reaction $$Cu(s) + S(s) \rightarrow CuS(s). $$What type of reaction is this?

Accepted Answer

Synthesis (Combination)

Question 16

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

Accepted Answer

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

Question 17

Which of the following best describes a double displacement reaction?

Accepted Answer

Two elements or groups in different compounds exchange places.

Question 18

Which of the following is a 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 19

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

Accepted Answer

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

Types of Chemical Reactions: Patterns and Practice

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