Question 1

Which of the following is the correct name for the compound with the formula $$\mathrm{Na_2SO_4}$$?

Accepted Answer

Sodium sulfate

Question 2

Which Lewis structure correctly represents carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 3

Given the electronegativities: H (2.1), Cl (3.0), which atom in HCl has the partial negative charge ($$\delta^-$$)?

Accepted Answer

Cl

Question 4

What is the molecular geometry of ammonia ($$\mathrm{NH_3$}) $$according to VSEPR theory?

Accepted Answer

Trigonal pyramidal

Question 5

Which of the following is a chemical change rather than a phase change?

Accepted Answer

Rusting of iron

Question 6

How many molecules are present in 2.00 moles of $$\mathrm{CO_2$}$$? ($$\mathrm{N_A = 6.022 	imes 10$$^{23}$$}$$ molecules/mol)

Accepted Answer

$$1.20 	imes 10$$^{24}$$

Question 7

Calculate the molar mass of calcium nitrate, $$\mathrm{Ca(NO_3$)_2}.$$

Accepted Answer

$$164\ \mathrm{g/mol}$$

Question 8

Balance the following equation: $$\mathrm{C_2H_6} + \mathrm{O_2$} \rightarrow \mathrm{CO_2$} + \mathrm{H_2O}$$

Accepted Answer

$$2\ \mathrm{C_2H_6} + 7\ \mathrm{O_2$} \rightarrow 4\ \mathrm{CO_2$} + 6\ \mathrm{H_2O}$$

Question 9

A reaction requires 0.50 moles of $$\mathrm{H_2SO_4}. $$How many grams is this? ($$\mathrm{H_2SO_4}$$ molar mass = $$98\ \mathrm{g/mol})$$

Accepted Answer

$$49\ \mathrm{g}$$

Question 10

A sample of gas occupies $$10.0\ \mathrm{L} at$$ $$2.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}. $$How many moles of gas are present? ($$R = 0.0821\ \mathrm{L\ atm\ $$mol^{-1}$$\ K$$^{-1}$$})$$

Accepted Answer

$$0.81$$

Question 11

According to the kinetic molecular theory, which statement is true about ideal gases?

Accepted Answer

Gas particles move in constant, random motion and have negligible volume compared to the container

Question 12

Which of the following is the solute in a solution of salt water?

Accepted Answer

Salt

Question 13

What is the molarity of a solution containing $$0.25$$ moles of $$\mathrm{NaCl} in$$ $$0.50\ \mathrm{L} of $$solution?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 14

Which of the following is a property of acids according to the Arrhenius definition?

Accepted Answer

They produce $$\mathrm{H^+}$$ ions in aqueous solution

Question 15

Which of the following is a strong acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl})$$

Question 16

What is the pH of a solution with $$[\mathrm{H_3O^+}] = 1.0 	imes 10$$^{-4}$$\ \mathrm{M}$$?

Accepted Answer

$$4.0$$

Question 17

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

Accepted Answer

$$\mathrm{H_2SO_4} + 2\ \mathrm{NaOH} \rightarrow \mathrm{Na_2SO_4} + 2\ \mathrm{H_2O}$$

Question 18

Assign the oxidation number to sulfur in $$\mathrm{H_2SO_4}.$$

Accepted Answer

+6

Question 19

In the reaction $$\mathrm{2Fe$$^{2+}$$ + Cl_2$ \rightarrow 2Fe$$^{3+}$$ + 2Cl^-}$$, which species is oxidized?

Accepted Answer

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

Question 20

Which statement is true about the cathode in an electrochemical cell?

Accepted Answer

Reduction occurs at the cathode

Chem 109 Unit II Study Guide: Bonding, Reactions, Gases, Solutions, Acids/Bases, and Redox

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