Question 1

Which of the following best describes what occurs during a chemical reaction?

Accepted Answer

Atoms are rearranged and exchanged to produce new molecules.

Question 2

What is the balanced chemical equation for the combustion of methane?

Accepted Answer

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

Question 3

In the reaction $$\mathrm{4Al(s) + 3O_2(g) \rightarrow 2Al_2O_3(s)}$$, how many moles of $$\mathrm{O_2$}$$ are required to completely react with 8 moles of $$\mathrm{Al}$$?

Accepted Answer

6 moles

Question 4

Which of the following is a decomposition reaction?

Accepted Answer

$$\mathrm{$$CaCO_3$$(s) \rightarrow CaO(s) + CO_2$(g)}$$

Question 5

A sample containing only C, H, and O is combusted, producing 2.445 g $$\mathrm{CO_2$}$$ and 0.6003 g $$\mathrm{H_2O}. $$What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{C_2H_4O}$$

Question 6

Which of the following best describes the role of a limiting reactant in a chemical reaction?

Accepted Answer

It is the reactant that determines the maximum amount of product that can be formed.

Question 7

Given the reaction $$\mathrm{2H_2 + O_2$ \rightarrow 2H_2O}$$, which mixture will produce the greatest amount of water?

Accepted Answer

2 mol $$\mathrm{H_2$}$$ and 1 mol $$\mathrm{O_2$}$$

Question 8

What is the percent yield if the theoretical yield of a reaction is 10.0 g and the actual yield is 7.5 g?

Accepted Answer

$$\mathrm{75\%}$$

Question 9

Which of the following is a combustion reaction?

Accepted Answer

$$\mathrm{C_4H_{10}(g) + O_2$(g) \rightarrow CO_2$(g) + H_2O(g)}$$

Question 10

If 3.0 g of ammonia ($$\mathrm{NH_3$}) $$reacts with 5.0 g of hydrogen chloride ($$\mathrm{HCl}) to $$form ammonium chloride ($$\mathrm{NH_4Cl}$$), which is the limiting reactant?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 11

Which statement about chemical equations is correct?

Accepted Answer

Coefficients indicate the relative number of molecules or moles involved in the reaction.

Question 12

What is the product when calcium hydride reacts with water?

Accepted Answer

$$\mathrm{Ca(OH)_2(aq) + H_2$(g)}$$

Question 13

Which group of elements is considered inert due to their filled valence shells?

Accepted Answer

Group 8A

Question 14

What is the empirical formula for a compound that yields 16.01 g $$\mathrm{CO_2$}$$ and 4.37 g $$\mathrm{H_2O}$$ upon combustion, and has a molar mass of 176 g/mol?

Accepted Answer

$$\mathrm{C_7H_8O}$$

Question 15

Which of the following is true about Group 1A elements?

Accepted Answer

They react with oxygen to form metal oxides.

Question 16

What is the theoretical yield of $$\mathrm{CO_2$} (in $$moles) produced from 22.0 moles of $$\mathrm{C_8H_{18}} in $$the combustion reaction $$\mathrm{2C_8H_{18}(l) + 25O_2(g) \rightarrow 16CO_2(g) + 18H_2O(g)}$$?

Accepted Answer

176 moles

Question 17

Which of the following is a combination reaction?

Accepted Answer

$$\mathrm{NH_3$(g) + HCl(g) \rightarrow NH_4Cl(s)}$$

Question 18

What is the correct stoichiometric coefficient for $$\mathrm{O_2$} in $$the combustion of octane ($$\mathrm{C_8H_{18}}$$)?

Accepted Answer

25

Question 19

Which of the following statements about Group 1B elements is correct?

Accepted Answer

They have high ionization energies due to incomplete shielding.

Chemical Reactions and Chemical Equations: Foundations and Applications

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