Q: What is the molarity of a solution containing 0.175 mol ZnCl$$_2 in $$exactly 150 mL of solution?

$$M = \frac{0.175}{0.150} = 1.17\ \text{M}$$

Q: If 30.0 g of benzene (C$$_6H$_6) $$reacts with 65.0 g of bromine (Br$$_2$$), what is the theoretical yield of bromobenzene (C$$_6H$_5Br$$)? (Molar masses: C$$_6H$_6 = 78.11 g/$$mol, Br$$_2 = 159.8 g/$$mol, C$$_6H$_5Br = 157.01 g/$$mol)

$$\text{Theoretical yield} = 60.4\ \text{g}$$

Q: How many milliliters of a 6.00 M NaOH solution are needed to provide 0.350 mol of NaOH?

$$V = \frac{0.350}{6.00} = 0.0583\ \text{L} = 58.3\ \text{mL}$$

Q: A 10.0-mL portion of 14.8 M NH$$_3$$ stock solution is diluted to a total volume of 0.500 L. What is the concentration of the final solution?

$$C_2$$ = \frac{14.8 \times 0.0100}{0.500} = 0.296\ \text{M}$$

Q: Which of the following is the correct balanced equation for the reaction between Na$$_2CO$_3$$ and AgNO$$_3 in $$aqueous solution?

$$\text{Na}_2\text{CO}_3(aq) + 2\text{AgNO}_3(aq) \rightarrow 2\text{NaNO}_3(aq) + \text{Ag}_2\text{CO}_3(s)$$

Q: How many grams of aluminum hydroxide (Al(OH)$$_3) $$are obtained from 14.2 g of aluminum sulfide (Al$$_2S$_3$$)? (Molar masses: Al$$_2S$_3 = 150.16 g/$$mol, Al(OH)$$_3 = 78.00 g/$$mol)

$$\text{Grams Al(OH)}_3 = 14.2 \times \frac{2}{1} \times \frac{78.00}{150.16} = 14.8\ \text{g}$$

Question 1

Which of the following statements about sulfuric acid (H$$_2SO$_4) is $$correct?

Accepted Answer

Sulfuric acid is a diprotic acid because it can donate two protons per molecule.

Question 2

A sample contains 0.0130 mol C, 0.0390 mol H, and 0.0065 mol O. What is the empirical formula of the compound?

Accepted Answer

C$$_2H$_6O$$

Question 3

Which of the following compounds is predicted to be soluble in water based on solubility rules?

Accepted Answer

MgBr$$_2$$

Question 4

What is the molarity of a solution containing 0.175 mol ZnCl$$_2 in $$exactly 150 mL of solution?

Accepted Answer

$$M = \frac{0.175}{0.150} = 1.17\ 	ext{M}$$

Question 5

Which ions are present in solution when FeCl$$_2 is $$dissolved in water?

Accepted Answer

Fe$$^{2+}$$ and 2Cl$$^{-}$$

Question 6

Which of the following is a redox reaction?

Accepted Answer

N$$_2(g) + 3H$_2(g$$) $$\rightarrow 2NH$_3(g)$$

Question 7

If 30.0 g of benzene (C$$_6H$_6) $$reacts with 65.0 g of bromine (Br$$_2$$), what is the theoretical yield of bromobenzene (C$$_6H$_5Br$$)? (Molar masses: C$$_6H$_6 = 78.11 g/$$mol, Br$$_2 = 159.8 g/$$mol, C$$_6H$_5Br = 157.01 g/$$mol)

Accepted Answer

$$	ext{Theoretical yield} = 60.4\ 	ext{g}$$

Question 8

Which of the following statements about oxidation is TRUE?

Accepted Answer

If a substance is oxidized, it is losing electrons.

Question 9

How many milliliters of a 6.00 M NaOH solution are needed to provide 0.350 mol of NaOH?

Accepted Answer

$$V = \frac{0.350}{6.00} = 0.0583\ 	ext{L} = 58.3\ 	ext{mL}$$

Question 10

Which compound is a strong electrolyte in water?

Accepted Answer

NaCl

Question 11

What is the oxidation number of manganese (Mn) in KMnO$$_4$$?

Accepted Answer

+7

Question 12

Which of the following is a weak acid?

Accepted Answer

CH$$_3$$COOH

Question 13

Which ions remain in solution, unreacted, after potassium carbonate and magnesium sulfate are mixed?

Accepted Answer

K$$^+$$ and SO$$_4$$^{2-}$$

Question 14

A 10.0-mL portion of 14.8 M NH$$_3$$ stock solution is diluted to a total volume of 0.500 L. What is the concentration of the final solution?

Accepted Answer

$$C_2$$ = \frac{14.8 	imes 0.0100}{0.500} = 0.296\ 	ext{M}$$

Question 15

Which of the following is the correct balanced equation for the reaction between Na$$_2CO$_3$$ and AgNO$$_3 in $$aqueous solution?

Accepted Answer

$$	ext{Na}_2	ext{CO}_3(aq) + 2	ext{AgNO}_3(aq) ightarrow 2	ext{NaNO}_3(aq) + 	ext{Ag}_2	ext{CO}_3(s)$$

Question 16

Which of the following compounds is predicted to be insoluble in water?

Accepted Answer

PbI$$_2$$

Question 17

How many grams of aluminum hydroxide (Al(OH)$$_3) $$are obtained from 14.2 g of aluminum sulfide (Al$$_2S$_3$$)? (Molar masses: Al$$_2S$_3 = 150.16 g/$$mol, Al(OH)$$_3 = 78.00 g/$$mol)

Accepted Answer

$$	ext{Grams Al(OH)}_3 = 14.2 	imes \frac{2}{1} 	imes \frac{78.00}{150.16} = 14.8\ 	ext{g}$$

Question 18

Which of the following is a combustion reaction?

Accepted Answer

C$$_5H$_{10}O$_2(l) + O$_2(g$$) $$\rightarrow CO$_2(g) + H$_2O(g)$$

Question 19

Which of the following statements about HCl is correct?

Accepted Answer

HCl is a strong acid because it fully dissociates in water.

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