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

A solution with $$[H^+] \u003e 1 \times 10$$^{-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 $$[H^+] \u003e 1 	imes 10$$^{-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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