CHEM 1001/CHM 1020/ Chm1025C/CHM1032C Name:________

Module 5 SamplePretest


Module Five Part N: Multiple Choice Chapters 8,9,10 10 points


____1. Which of the following is equal to one mole of substance?

(A) 6.02 x 1023 sodium atoms, Na

(B) 6.02 x 1023 chlorine molecules, Cl2

(C) 6.02 x 1023 sodium chloride formula units, NaCl

(D) 6.02 x 1023 chloride ions, Cl 1-

(E) A & B are both correct

(F) C & D are both correct

(G) all of the above are correct


____2. Which of the following represents 1 mole of ozone gas, O3?

(A) 6.02 x 1023 ozone molecules

(B) 48.0 g ozone gas

(C) 22.4 L ozone gas at STP

(D) all of the above

(E) none of the above


_____3. What is the molecular mass of mercurous nitrate, Hg2(NO3)2 ?

(A) 463.2 g/mol

(B) 477.2 g/mol

(C) 511.2 g/mol

(D) 525.2 g/mol

(E) 649.2 g/mol

(F) none of the above


_____4. If 0.125 mol of S combines with 0.250 mol of O, what is the empirical formula of sulfur oxide?

(A) SO

(B) SO2

(C) SO4

(D) S2O

(D) S4O


_____ 5. The insulating material Styrofoam is a polymer of styrene. Find the molecular formula of styrene given its percentage composition:

92.25% Carbon, 7.75% hydrogen.

The approximate molar mass is 104 g/mol.

(A) C1H1

(B) C1H8

(C) C1H12

(D) C8H8

(E) C12H1

_____6. What is the term that expresses the simplest whole number ratio of atoms in a molecule, or ions in a formula unit?

(A) chemical formula

(B) simplest formula

(C) molecular formula

(D) empirical formula

(E) mass ratio composition

(F) percentage composition


_____7. Which of the following is evidence for a chemical reaction?

(A) a gas is detected

(B) a precipitate is formed

(C) a color change is observed

(D) an energy change is noted

(E) both B & C are correct

(F) all are correct

(G) none of the above


_____8. What is the term for a compound that releases hydrogen ions when dissolved in water?

(A) acid

(B) aqueous acid

(C) base

(D) aqueous base

(E) none of the above


______9. The product(s) of a neutralization reaction is (are)

(A) water

(B) aqueous acid

(C) aqueous base

(D) salt

(E) aqueous acid and aqueous base

(F) aqueous acid and water

(G) salt and water

(H) aqueous base and water

(I) aqueous acid, water, aqueous base

(J) none of the above


______10. Ethane, C2H6, burns to give carbon dioxide and water. What is the coefficient of oxygen gas need to balance the reaction:

(A) 5

(B) 7

(C) 10

(D) 14

(E) none of the above

Use the following choice in questions 11-15 to classify each of the following chemical equations (unbalanced):


A. Combination (or synthesis)

B. Decomposition (or analysis)

C. Single replacement

D. Double Replacement

E. Neutralization

F. Combustion


_____11. C5H12 + O2 CO2 + H2O



_____12. K + S K2S



_____13. Al(OH)3 + HNO3 Al(NO3)3 + H2O



_____14. Zn + HCl ZnCl2 + H2



_____15. KClO3 KCl + O2





1.g 2. d 3. d 4. b 5. d 6.d 7.f 8.b 9.g 10.b


11. f 12. a 13. e 14.c 15.b