Question 1

Which of the following best describes the role of coefficients in a balanced chemical equation?

Accepted Answer

They represent the ratios of reactants and products involved in the reaction.

Question 2

Balance the following equation and select the correct coefficient for O$$_2$$: $$C_8H_{18}(g) + O_2$(g) \rightarrow CO_2$(g) + H_2O(g)$$

Accepted Answer

25

Question 3

Which of the following is a precipitation reaction?

Accepted Answer

$$NaCl(aq) + $$AgNO_3$$(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)$$

Question 4

Which of the following compounds is most likely to form an insoluble sulfate in water?

Accepted Answer

$$Ca^{2+}$$

Question 5

What is the net ionic equation for the reaction between aqueous solutions of $$K_2S$$ and $$Fe(NO_3$)_2$$?

Accepted Answer

$$Fe^{2+}(aq$$) + $$S^{2-}(aq$$) \rightarrow FeS(s)$$

Question 6

Which of the following is a weak acid?

Accepted Answer

$$HF$$

Question 7

A neutralization reaction between an acid and a metal hydroxide produces:

Accepted Answer

Water and a salt

Question 8

Which of the following are strong electrolytes?

Accepted Answer

$$HCl$$, $$KCl$$

Question 9

Determine the oxidation state of nitrogen in $$KNO_3.$$

Accepted Answer

+5

Question 10

In the reaction $$2Ca(s) + O_2$(g) \rightarrow 2CaO(s)$$, which species is oxidized?

Accepted Answer

$$Ca$$

Question 11

How many grams of $$Li_3N$$ can be formed from 1.75 moles of Li? (Assume excess nitrogen.) $$6Li(s) + N_2$(g) \rightarrow 2Li_3N(s)$$

Accepted Answer

20.3 g

Question 12

A 0.4550-g solid mixture containing $$MgSO_4 is $$dissolved in water and treated with excess $$Ba(NO_3$)_2$$, resulting in the precipitation of 0.6168 g of $$BaSO_4. $$What is the mass percent of $$MgSO_4 in $$the mixture? (Molar mass: $$BaSO_4 = 233.39$ g/mol, $$MgSO_4$$ = 120.37 g/$$mol)

Accepted Answer

65.2%

Question 13

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 0.2845 g of $$CO_2$$ and 0.1451 g of $$H_2O. $$What is the empirical formula of the compound?

Accepted Answer

$$CH_2$$

Question 14

A titration of 25.0 mL of an unknown concentration $$H_2SO_4$$ solution requires 83.6 mL of 0.12 M $$LiOH$$ solution. What is the concentration of the $$H_2SO_4$$ solution (in M)?

Accepted Answer

0.20 M

Question 15

Which of the following reactions is NOT an oxidation-reduction reaction?

Accepted Answer

$$FeCl_2 + 2$$NaOH \rightarrow Fe(OH)_2 + 2NaCl$$

Question 16

Which of the following best describes the process of gravimetric analysis?

Accepted Answer

Separating and weighing a precipitate to determine the amount of analyte.

Question 17

Which of the following ions is a spectator ion in the reaction $$AgNO_3 + $$LiI \rightarrow AgI + $$LiNO_3$$?

Accepted Answer

$$Li^+(aq), NO_3$^-(aq)$$

Question 18

Which of the following is NOT a strong base?

Accepted Answer

$$NH_3$$

Question 19

What is the oxidation state of chlorine in $$ClO^-$$?

Accepted Answer

+1

Stoichiometry of Chemical Reactions: Study Notes for General Chemistry

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