Q: Which of the following is a correct statement about acids and bases?

A solution with $[H^+] > 1 \times 10^{-7}\ \mathrm{M}$ is acidic.

Question 1

A solution is prepared by dissolving 5.0 g of NaCl in 95.0 g of water. What is the mass percent of NaCl in the solution?

Accepted Answer

$5\%$

Question 2

Which of the following is NOT included in the equilibrium expression for a chemical reaction?

Accepted Answer

Pure solids

Question 3

If the pH of a solution is $3.5$, what is the hydrogen ion concentration $[H^+]$?

Accepted Answer

$[H^+] = 10^{-3.5}\ \mathrm{M}$

Question 4

A $0.25\ \mathrm{M}$ solution of $H_2SO_4$ neutralizes $125\ \mathrm{mL}$ of $0.1\ \mathrm{M}$ $NaOH$. What volume of $H_2SO_4$ was used?

Accepted Answer

$25\ \mathrm{mL}$

Question 5

Which of the following statements best describes what happens to the equilibrium position when the concentration of a reactant is increased in a system at equilibrium?

Accepted Answer

The equilibrium shifts to the right, favoring product formation.

Question 6

What is the oxidation number of chromium in $Cr_2O_7^{2-}$?

Accepted Answer

$+6$

Question 7

Which of the following is the correct equilibrium expression for the reaction: $aA + bB \rightleftharpoons cC + dD$?

Accepted Answer

$K = \dfrac{[C]^c[D]^d}{[A]^a[B]^b}$

Question 8

A radioactive isotope has a half-life of $5$ days. If you start with $80\ \mathrm{g}$, how much remains after $15$ days?

Accepted Answer

$10\ \mathrm{g}$

Question 9

Which of the following is a correct statement about acids and bases?

Accepted Answer

A solution with $[H^+] > 1 	imes 10^{-7}\ \mathrm{M}$ is acidic.

Question 10

Which particle has the highest penetration power?

Accepted Answer

Gamma ray

Question 11

What is the pH of a solution with $[H^+] = 2.5 	imes 10^{-4}\ \mathrm{M}$?

Accepted Answer

$3.60$

Question 12

Which of the following is the reducing agent in the reaction: $Mg + CuSO_4 \rightarrow MgSO_4 + Cu$?

Accepted Answer

$Mg$

Question 13

If the equilibrium constant $K$ for a reaction is much greater than $1$, what does this indicate about the reaction at equilibrium?

Accepted Answer

Products are favored over reactants.

Question 14

Which of the following best describes what happens to the rate of a radioactive decay as the number of undecayed nuclei decreases?

Accepted Answer

The rate decreases.

Question 15

Which of the following is the correct balanced equation for the beta decay of $^{14}C$?

Accepted Answer

$^{14}C \rightarrow ^{14}N + \beta$

Question 16

A $0.50\ \mathrm{M}$ solution of $HCl$ is diluted to $1.0\ \mathrm{L}$ with water. If $250\ \mathrm{mL}$ of this solution is used, how many moles of $HCl$ are present?

Accepted Answer

$0.125\ \mathrm{mol}$

Question 17

Which of the following is a correct statement about oxidation and reduction?

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 18

If the concentration of $CO_2$ is increased in the equilibrium $CaCO_3(s) \rightleftharpoons CaO(s) + CO_2(g)$, what happens to the amount of $CaCO_3$?

Accepted Answer

It increases.

Question 19

Which of the following is the correct formula for calculating pOH?

Accepted Answer

$pOH = -\log[OH^-]$

General Chemistry Study Guide: Solutions, Acids & Bases, Equilibrium, Nuclear Chemistry, and Redox

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