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MCAT Chemistry Practice Questions

1. Given the balanced equation: Mg(s) + 2HCL(aq) ® MgCl₂(aq) + H₂(g). At STP, what is the total number of liters of hydrogen gas produced when 3.00 moles of hydrochloric acid solution is completely consumed?

A: 1.2 L

B: 2.4 L

C: 33.6 L

D: 4.8 L

2. Given the reaction at equilibrium: 2CO(g) + O2(g) ® 2CO₂(g). When the reaction is subjected to stress, a change will occur in the concentration of

A: Reactants, only

B: Products, only

C: Both products and reactants

D: Neither reactants nor products

3. What is the concentration of a solution of 10 moles of copper (II) nitrate in 5.0 liters of solution?

A: .50 M

B: 2.0 M

C: 5.0 M

D: 10 M

4. An increase of the temperature of a system at equilibrium favors the

A: Endothermic reaction and decreases its rate

B: Endothermic reaction and increases its rate

C: Exothermic reaction and decreases its rate

D: Exothermic reaction and increases its rate

5. A compound that can act as an acid or a base is referred to as

A: A neutral substance

B: An amphoteric substance

C: A monomer

D: An isomer

6. Which compound is an electrolyte?

A: CH₃OH

B: CH₃COOH

C: C₃H₅(OH)₃

D: C₁₂H₂₂O₁₁

7. What is the oxidation number of chlorine in HClO₄?

A: +1

B: +5

C: +3

D: +7

8. Given the redox reaction: Fe²⁺(aq) + Zn(s) ® Zn²⁺(aq) + Fe(s)

Which species acts as a reducing agent?

A: Fe(s)

B: Fe²⁺(aq)

C: Zn(s)

D: Zn²⁺(aq)

9. Given the reaction: Zn(s) + 2HCl(aq) ® ZnCl₂(aq) + H₂(g)

Which equation represents the correct oxidation half-reaction?

A: Zn(s) ® Zn²⁺ + 2e^-

B: 2H + 2e^- ® H₂(g)

C: Zn²⁺ + 2e ® Zn(s)

D: 2Cl^- ® Cl₂(g) + 2e^-

10. Which organic compound is classified as an acid?

A: HC₃HC₂COOH

B: HC₃HC₂OH

C: C₁₂H₂₂O₁₁

D: C₆H₁₂O₆

11. The products of the fermentation of a sugar are ethanol and

A: Water

B: Oxygen

C: Carbon dioxide

D: Sulfur dioxide

12. The reaction CH₂CH₂ + H₂ ® CH₃CH₃ is an example of

A: Substitution

B: Addition

C: Esterification

D: Fermentation

13. In which pair of hydrocarbons does each compound contain only one double bond per molecule?

A: C₂H₂ and C₂H₆

B: C₂H₂ and C₃H₆

C: C₄H₈ and C₂H₄

D: C₆H₆ and C₇H₈

14. The characteristic bright line spectrum of an element is produced when its electrons

A: Form a covalent bond

B: Form an ionic bond

C: Move to a higher energy state

D: Move to a lower energy state

15. Which emanation has no mass and no charge?

A: Alpha

B: Beta

C: Gamma

D: Neutron

16. In which system do molecule-ion attractions exist?

A: NaCl(aq)

B: NaCl(s)

C: C₆H₁₂O₆(aq)

D: C₆H₁₂O₆(s)

17. Which metal is most likely obtained by the electrolysis of its fused salt?

A: Au

B: Ag

C: Li

D: Zn

18. Because of its high reactivity, which element is never found free in nature?

A: O

B: F

C: N

D: Ne

19. Which of the following is the weakest Bronsted acid?

A: NH₄⁺

B: HSO₄^-

C: H₂SO₄

D: HNO₃

20. What is the pH of a solution with a hydronium ion concentration of .01 mole per liter?

A: 1

B: 2

C: 10

D: 14

21.Which compound is a salt?

A: CH₃OH

B: C₆H₁₂O₆

C: H₂C₂O₄

D: KC₂H₃O₂

22. During fractional distillation, hydrocarbons are separated according to their

A: Boiling points

B: Melting points

C: Triple points

D: Saturation points

23. Iron corrodes more easily than aluminum and zinc because aluminum and zinc both

A: Are reduced

B: Are oxidizing agents

C: Form oxides that are self-protective

D: Form oxides that are very reactive

24. Which substance is produced by the Haber process?

A: Aluminum

B: Ammonium

C: Nitric acid

D: Sulfuric acid

25. A particle accelerator can increase the kinetic energy of

A: An alpha particle and a beta particle

B: An alpha particle and a neutron

C: A gamma ray and a beta particle

D: A neutron and a gamma ray

Answer Key