Q: Balance the following equation and classify the reaction: $$\_\_\_\text{C}_2\text{H}_4 + \_\_\_\text{O}_2 \rightarrow \_\_\_\text{CO}_2 + \_\_\_\text{H}_2\text{O}$$

$$\text{C}_2\text{H}_4 + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}$$; Combustion

Q: Which of the following is a correct net ionic equation for the reaction: $$\text{Zn(NO}_3)_2 (aq) + \text{Na}_2\text{CO}_3 (aq) \rightarrow \text{ZnCO}_3 (s) + 2\text{NaNO}_3 (aq)$$?

$$\text{Zn}^{2+} (aq) + \text{CO}_3$$^{2-}$$ (aq) \rightarrow \text{ZnCO}_3 (s)$$

Q: Which of the following reactions is a double-replacement reaction?

$$\text{BaCl}_2 (aq) + \text{Na}_2\text{SO}_4 (aq) \rightarrow 2\text{NaCl} (aq) + \text{BaSO}_4 (s)$$

Q: Which of the following is a correct balanced equation for the neutralization of sulfuric acid with aluminum hydroxide?

$$3\text{H}_2\text{SO}_4 + 2\text{Al(OH)}_3 \rightarrow 6\text{H}_2\text{O} + \text{Al}_2(\text{SO}_4)_3$$

Q: Which of the following is the correct net ionic equation for the reaction between $$\text{HCl}$$ and $$\text{NaOH}$$?

$$\text{H}^+ (aq) + \text{OH}^- (aq) \rightarrow \text{H}_2\text{O} (l)$$

Q: Which of the following is the correct balanced equation for the decomposition of potassium chlorate?

$$2\text{KClO}_3 \rightarrow 2\text{KCl} + 3\text{O}_2$$

Question 1

Which of the following best illustrates the law of conservation of mass in a chemical reaction?

Accepted Answer

The total mass of reactants equals the total mass of products in a closed system.

Question 2

Given the reaction: $$2	ext{Na} + 	ext{Cl}_2 ightarrow 2	ext{NaCl}$$, if you start with 23 g of sodium and 35 g of chlorine gas, what is the mass of sodium chloride formed?

Accepted Answer

58 g

Question 3

Which of the following is NOT a diatomic element?

Accepted Answer

Neon ($$	ext{Ne})$$

Question 4

Balance the following equation and classify the reaction: $$\_\_\_	ext{C}_2	ext{H}_4 + \_\_\_	ext{O}_2 ightarrow \_\_\_	ext{CO}_2 + \_\_\_	ext{H}_2	ext{O}$$

Accepted Answer

$$	ext{C}_2	ext{H}_4 + 3	ext{O}_2 ightarrow 2	ext{CO}_2 + 2	ext{H}_2	ext{O}$$; Combustion

Question 5

Which of the following is a correct net ionic equation for the reaction: $$	ext{Zn(NO}_3)_2 (aq) + 	ext{Na}_2	ext{CO}_3 (aq) ightarrow 	ext{ZnCO}_3 (s) + 2	ext{NaNO}_3 (aq)$$?

Accepted Answer

$$	ext{Zn}^{2+} (aq) + 	ext{CO}_3$$^{2-}$$ (aq) ightarrow 	ext{ZnCO}_3 (s)$$

Question 6

Which of the following reactions is a double-replacement reaction?

Accepted Answer

$$	ext{BaCl}_2 (aq) + 	ext{Na}_2	ext{SO}_4 (aq) ightarrow 2	ext{NaCl} (aq) + 	ext{BaSO}_4 (s)$$

Question 7

Which of the following is insoluble in water according to the solubility rules?

Accepted Answer

$$	ext{PbCl}_2$$

Question 8

What is the oxidation number of iron in $$	ext{FeCl}_3$$?

Accepted Answer

+3

Question 9

In the reaction $$2	ext{FeCl}_3 + 	ext{SnCl}_2 ightarrow 2	ext{FeCl}_2 + 	ext{SnCl}_4$$, which element is oxidized?

Accepted Answer

Sn

Question 10

Which of the following is a correct balanced equation for the neutralization of sulfuric acid with aluminum hydroxide?

Accepted Answer

$$3	ext{H}_2	ext{SO}_4 + 2	ext{Al(OH)}_3 ightarrow 6	ext{H}_2	ext{O} + 	ext{Al}_2(	ext{SO}_4)_3$$

Question 11

Which of the following is a sign that a chemical reaction has occurred?

Accepted Answer

A precipitate forms when two solutions are mixed.

Question 12

Which of the following best describes a combustion reaction?

Accepted Answer

A hydrocarbon reacts with oxygen to produce carbon dioxide and water.

Question 13

Which of the following is the correct net ionic equation for the reaction between $$	ext{HCl}$$ and $$	ext{NaOH}$$?

Accepted Answer

$$	ext{H}^+ (aq) + 	ext{OH}^- (aq) ightarrow 	ext{H}_2	ext{O} (l)$$

Question 14

Which of the following is a correct classification for the reaction: $$	ext{Ca(OH)}_2 + 	ext{H}_3	ext{PO}_4 ightarrow 	ext{Ca}_3(	ext{PO}_4)_2 + 	ext{H}_2	ext{O}$$?

Accepted Answer

Double replacement (acid-base neutralization)

Question 15

Which of the following is the correct balanced equation for the decomposition of potassium chlorate?

Accepted Answer

$$2	ext{KClO}_3 ightarrow 2	ext{KCl} + 3	ext{O}_2$$

Question 16

Which of the following is a correct example of a single-replacement reaction?

Accepted Answer

$$	ext{Cu} + 2	ext{AgNO}_3 ightarrow 	ext{Cu(NO}_3)_2 + 2	ext{Ag}$$

Question 17

Which of the following compounds is a salt formed from an acid-base reaction?

Accepted Answer

$$	ext{NaCl}$$

Question 18

Which of the following is the correct balanced equation for the reaction between hydrobromic acid and magnesium hydroxide?

Accepted Answer

$$2	ext{HBr} + 	ext{Mg(OH)}_2 ightarrow 2	ext{H}_2	ext{O} + 	ext{MgBr}_2$$

Chemical Reactions: Classification, Balancing, and Applications

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