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 à CO2 +
H2O
_____12. K + S
à
K2S
_____13. Al(OH)3 +
HNO3 à Al(NO3)3 +
H2O
_____14. Zn
+ HCl à ZnCl2 +
H2
_____15. KClO3 à KCl +
O2
Answwers:
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