SAT Chemistry Online Practice Test 1: Part D

Test Information

Question 14 questions

Time 10 minutes

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Directions: Every question below contains two statements, I in the left-hand column and II in the right-hand column. For each question, decide if statement I is true or false and whether statement II is true or false, and fill in the corresponding T or F ovals on your answer sheet. *Fill in oval CE only if statement II is a correct explanation of statement I.

1. A catalyst can accelerate a chemical reaction
BECAUSE
a catalyst can decrease the activation energy required for the reaction to occur.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

2. Molten sodium chloride is a good electrical conductor
BECAUSE
sodium chloride in the molten state allows ions to move freely.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

3. Ice is less dense than liquid water
BECAUSE
water molecules are nonpolar.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

4. Two isotopes of the same element have the same mass number
BECAUSE
isotopes have the same number of protons.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

5. A 1.0 g sample of calcium citrate, Ca3(C6H5O7)2 (molar mass 498 g/mol), contains more Ca than a 1.0 g sample of calcium carbonate, CaCO3 (molar mass 100 g/mol)
BECAUSE
there are more Ca atoms in 1.0 mol of calcium carbonate than in 1.0 mol of calcium citrate.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

6. Two liters of CO2 can be produced by 1 gram of carbon burning completely
BECAUSE
the amount of gas evolved in a chemical reaction can be determined by using the mole relationship of the coefficients in the balanced equation.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

7. A reaction is at equilibrium when it reaches completion
BECAUSE
the concentrations of the reactants in a state of equilibrium equal the concentrations of the products.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

8. The anions in an electrolytic cell migrate to the cathode
BECAUSE
positively charged ions are attracted to the negatively charged cathode in an electrolytic cell

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

9. A solution with pH = 5 has a higher concentration of hydronium ions than a solution with a pH = 3
BECAUSE
pH is defined as -log [H+].

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

10. An endothermic reaction can be spontaneous
BECAUSE
both the enthalpy and the entropy changes affect the Gibbs free-energy change of the reaction.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

11. Weak acids have small values for the equilibrium constant, Ka,
BECAUSE
the concentration of the hydronium ion is in the numerator of the Ka expression.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

12. One mole of NaCl contains 2 moles of ions
BECAUSE
NaCl is a stable salt at room temperature.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

13. A pi bond is formed between the lobes of adjacent p orbitals in the same plane of two atoms that contain only one electron each
BECAUSE
each of the two lobes of a single p orbital can hold two electrons of opposite spin.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

14. H2S and H2O have a significant difference in their boiling points
BECAUSE
hydrogen sulfide has a higher degree of hydrogen bonding than water.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE