Q: How many hydrogen atoms are present in 1.2 mol of $$\mathrm{(NH_4$)_2S}$$?

$$1.2 \times 8 \times 6.02 \times 10$$^{23}$$

Question 1

Which of the following best describes a molecular compound?

Accepted Answer

A compound composed of nonmetals sharing electrons

Question 2

What is the correct IUPAC name for the compound $$\mathrm{K_2Cr_2O_7}$$?

Accepted Answer

Potassium dichromate

Question 3

How many hydrogen atoms are present in 1.2 mol of $$\mathrm{(NH_4$)_2S}$$?

Accepted Answer

$$1.2 	imes 8 	imes 6.02 	imes 10$$^{23}$$

Question 4

Which of the following is the correct balanced equation for the reaction of methane with oxygen to form carbon dioxide and water?

Accepted Answer

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

Question 5

A reaction mixture contains 4.5 mol of Zn and 2.0 mol of HCl. According to the equation $$\mathrm{Zn + 2HCl \rightarrow $$ZnCl_2$$ + H_2$}$$, what is the limiting reactant?

Accepted Answer

HCl

Question 6

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl} in $$aqueous solution?

Accepted Answer

$$\mathrm{Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)}$$

Question 7

Which species is oxidized in the reaction $$\mathrm{$$MnO_4$$^- + 8H^+ + 5Fe$$^{2+}$$ \rightarrow Mn$$^{2+}$$ + 5Fe$$^{3+}$$ + 4H_2O}$$?

Accepted Answer

$$\mathrm{Fe$$^{2+}$$}$$

Question 8

What is the oxidation number of manganese in $$\mathrm{$$KMnO_4$$}$$?

Accepted Answer

+7

Question 9

Which of the following is the correct molecular formula for sodium carbonate?

Accepted Answer

$$\mathrm{Na_2CO_3}$$

Question 10

A solution contains $$\mathrm{0.25~mol} of$$ $$\mathrm{NaCl}$$ dissolved in $$\mathrm{500~mL} of $$water. What is the molarity of the solution?

Accepted Answer

$$0.50~\mathrm{M}$$

Question 11

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Question 12

Which of the following is a spectator ion in the reaction between $$\mathrm{K_2SO_4}$$ and $$\mathrm{Ba(NO_3$)_2} in $$aqueous solution?

Accepted Answer

$$\mathrm{K^+}$$

Question 13

Which of the following is the correct balanced molecular equation for the reaction of $$\mathrm{$$MgCl_2$$}$$ with $$\mathrm{Na_2CO_3} in $$aqueous solution?

Accepted Answer

$$\mathrm{$$MgCl_2$$ (aq) + Na_2CO_3 (aq) \rightarrow $$MgCO_3$$ (s) + 2NaCl (aq)}$$

Question 14

Which of the following is the correct formula for aluminum sulfide?

Accepted Answer

$$\mathrm{Al_2S_3}$$

Question 15

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

Accepted Answer

$$\mathrm{H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)}$$

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