Question 1

Which of the following best describes a molecular element?

Accepted Answer

A substance composed of only one type of atom, bonded together in molecules, such as $$\mathrm{O_2$}.$$

Question 2

What is the correct IUPAC name for the compound $$\mathrm{CH_3CH_2CH_2COOH}$$?

Accepted Answer

Butanoic acid

Question 3

How many grams are in $$7.50 	imes 10$$^{24}$$ molecules of $$\mathrm{$$SO_2$$}$$? (Molar mass of $$\mathrm{$$SO_2$$}$$ = 64.07 g/mol)

Accepted Answer

$$797 g$$

Question 4

Which of the following is the correct balanced chemical equation for the combustion of methane ($$\mathrm{CH_4$}) $$with oxygen?

Accepted Answer

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

Question 5

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

Accepted Answer

HCl

Question 6

How many hydrogen atoms are in 1.2 mol of $$\mathrm{(NH_4$)_2SO_4}$$?

Accepted Answer

$$5.8 	imes 10$$^{24}$$

Question 7

Which of the following is the net ionic equation for the reaction between $$\mathrm{K_2SO_4(aq)}$$ and $$\mathrm{Ba(NO_3$)_2(aq)}$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$(aq) + SO_4$^{2-}(aq) \rightarrow $$BaSO_4$$(s)}$$

Question 8

Which of the following compounds is correctly named?

Accepted Answer

NaClO$$_4 is $$sodium perchlorate

Question 9

Which of the following is the correct molecular equation for the reaction between $$\mathrm{$$MgCl_2$$(aq)}$$ and $$\mathrm{Na_2CO_3(aq)}$$?

Accepted Answer

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

Question 10

Which of the following is the correct oxidation state of manganese in $$\mathrm{$$KMnO_4$$}$$?

Accepted Answer

+7

Question 11

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{$$AgNO_3$$(aq)}$$ and $$\mathrm{NaCl(aq)}$$?

Accepted Answer

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

Question 12

Which of the following is the correct name for $$\mathrm{H_2SO_3}$$?

Accepted Answer

Sulfurous acid

Question 13

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

Accepted Answer

$$\mathrm{Al_2S_3}$$

Question 14

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

Accepted Answer

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

Question 15

Which of the following is the correct name for $$\mathrm{K_2Cr_2O_7}$$?

Accepted Answer

Potassium dichromate

Question 16

Which of the following is the correct molecular equation for the reaction between $$\mathrm{$$BaCl_2$$(aq)}$$ and $$\mathrm{Na_2SO_4(aq)}$$?

Accepted Answer

$$\mathrm{$$BaCl_2$$(aq) + Na_2SO_4(aq) \rightarrow $$BaSO_4$$(s) + 2NaCl(aq)}$$

Question 17

Which of the following is the correct formula for hydrosulfuric acid?

Accepted Answer

$$\mathrm{H_2S}$$

Question 18

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{Mg(NO_3$)_2(aq)}$$ and $$\mathrm{Na_2CO_3(aq)}$$?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$(aq) + CO_3$^{2-}(aq) \rightarrow $$MgCO_3$$(s)}$$

Question 19

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

Accepted Answer

Sulfuric acid

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