Question 1

A solution is prepared by dissolving 2.52 g of potassium nitrate (KNO\_3) in enough water to make 0.250 L of solution. What is the molar concentration of KNO\_3 in the solution? (Molar mass of KNO\_3 = 101.1 g/mol)

Accepted Answer

$0.100\ \mathrm{M}$

Question 2

Which of the following is required to determine the molarity of a solution made by dissolving NaCl in water?

Accepted Answer

Only the mass of NaCl and the final volume of solution

Question 3

You have a solution that contains 100 g of KNO\_3 in 100 g of water at 40°C. Based on the solubility curve for KNO\_3, which statement is correct?

Accepted Answer

The solution is saturated.

Question 4

A series of experiments were carried out for the reaction $2A + B \rightarrow C$. Based on the data, what is the rate law?

Accepted Answer

$	ext{rate} = k[A]^2[B]$

Question 5

For a first-order, radioactive decay of nitrogen-16 with a half-life of 7.1 seconds, what fraction of a sample of nitrogen-16 remains after 14.2 seconds?

Accepted Answer

$\frac{1}{4}$

Question 6

If the plot of $[A]$ versus time is linear, the reaction is:

Accepted Answer

Zero order

Question 7

For the reaction $N_2O_4(g) \rightleftharpoons 2NO_2(g)$, the equilibrium mixture is shown to the right with the resulting amount of each. What is the value of $K_c$ for the reaction at equilibrium?

Accepted Answer

$K_c = \frac{[NO_2]^2}{[N_2O_4]}$

Question 8

For the reaction $3A(g) \rightleftharpoons A(g) + 2B(g)$, the initial mixture consists of all reactants. What is the equilibrium partial pressure of A(g) when starting with 0.60 atm of A(g) and products at this temperature?

Accepted Answer

$0.60$

Question 9

For the reaction $CO(g) + Cl_2(g) \rightarrow COCl_2(g)$, what will happen to the concentration of CO if the pressure is increased?

Accepted Answer

Decrease

Question 10

Which of the following solutions has a pH greater than 7?

Accepted Answer

$NaOH(aq)$

Question 11

What is the pH of 0.15 M $CH_3COOH$ ($K_a = 1.8 	imes 10^{-5}$)?

Accepted Answer

2.91

Question 12

Which buffer has a pH greater than that of pure water?

Accepted Answer

$CH_3COONa$

Question 13

For the titration of 0.10 M benzoic acid ($K_a = 6.3 	imes 10^{-5}$) with 0.10 M NaOH, what is the pH at the equivalence point?

Accepted Answer

8.24

Question 14

What is the oxidation state of the carbon atom in benzaldehyde?

Accepted Answer

+1

Question 15

What is the coefficient for water when the reaction is balanced in basic solution? $Cr_2O_7^{2-} + Cr^{3+} \rightarrow CrO_4^{2-} + Cr^{2+}$

Accepted Answer

6

Question 16

What is the strongest reducing agent among the following?

Accepted Answer

$Cr^{2+}$

Question 17

What is missing from the nuclear reaction shown? $^{238}_{92}U \rightarrow ^{234}_{90}Th + ?$

Accepted Answer

$^4_2He$

Question 18

When radon-226 decays to radon-222, what particle is emitted?

Accepted Answer

Alpha particle

Question 19

For the formation of $NO_2(g)$ from $NO(g)$ and $O_2(g)$, what is the change in entropy ($\Delta S$) at 298 K?

Accepted Answer

$-154.60\ \mathrm{J\ mol^{-1}\ K^{-1}}$

ACS General Chemistry Second-Term Practice Items: Comprehensive Study Notes

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