CHM 113 EXAM 1 QUESTIONS & ANSWERS

CHM 113 EXAM 1 QUESTIONS & ANSWERS

Match the reaction type with the reaction (1)
A. Combination
B. Combustion
C. Decomposition
D. Neutralization
E. Precipitation
F. Single-displacement

1. Ba(OH)2 + H2SO4 à 2 H2O + BaSO4
2. Cl2 + 2 NaI à 2NaCl + I2
3. P4 + 10 Cl2 à 4 PCl5
4. H2O2 à H2 + O2 - Answer -d

Match the reaction type with the reaction (2)
A. Combination
B. Combustion
C. Decomposition
D. Neutralization
E. Precipitation
F. Single-displacement

1. Ba(OH)2 + H2SO4 à 2 H2O + BaSO4
2. Cl2 + 2 NaI à 2NaCl + I2
3. P4 + 10 Cl2 à 4 PCl5
4. H2O2 à H2 + O2 - Answer -f

Match the reaction type with the reaction (3)
A. Combination
B. Combustion
C. Decomposition
D. Neutralization
E. Precipitation
F. Single-displacement

1. Ba(OH)2 + H2SO4 à 2 H2O + BaSO4
2. Cl2 + 2 NaI à 2NaCl + I2
3. P4 + 10 Cl2 à 4 PCl5
4. H2O2 à H2 + O2 - Answer -a

Match the reaction type with the reaction (4)
A. Combination
B. Combustion
C. Decomposition

,D. Neutralization
E. Precipitation
F. Single-displacement

1. Ba(OH)2 + H2SO4 à 2 H2O + BaSO4
2. Cl2 + 2 NaI à 2NaCl + I2
3. P4 + 10 Cl2 à 4 PCl5
4. H2O2 à H2 + O2 - Answer -c

Select the correct statement below that fits a theoretical yield when a reaction between
equal masses of Ca and O occurs to produce CaO.

A. The mass of CaO produced equals the sum of the starting masses of Ca and O
B. The mass of CaO produced is more than the sum of the masses of Ca and O
C. The mass of CaO produced is less than the sum of the masses of Ca and O
D. There is not enough information to complete this question
E. None of the answer choices are correct - Answer -The mass of CaO produced
equals the sum of the starting masses of Ca and O

Using the image, select the chemical equation that best represents the balanced
chemical reaction (using smallest whole number coefficients).


A. X2 + YX -> YX2
B. 2 X2 + 4 YX -> 4 YX2
C. X2 + 2 YX -> 2 YX2
D. Y2 + YX à Y2X
E. None of the above - Answer -c

Select the correct set of coefficients for the balanced chemical reaction using smallest
whole number coefficients.

RbOH(aq) + Al2(SO4)3(aq) à Rb2SO4(aq) + Al(OH)3(s)

A. 1, 1, 1, 1
B. 3, 1, 2, 2
C. 3, 1, 3, 1
D. 6, 1, 3, 2
E. 12, 1, 12, 6 - Answer -6, 1, 3, 2

Which of the following equations is not balanced?

A. C6H12O6 + 6 O2 à 6 CO2 + 6 H2O
B. C2H5OH(l) + 3 O2(g) à 2 CO2(g) + 2 H2O(g)
C. C2H4(g) + 3 O2(g) à 2 CO2(g) + 2 H2O(g)
D. C3H8(l) + 5 O2(g) à 3 CO2(g) + 4 H2O(g)

, E. C3H6O(l) + 4 O2(g) à 3 CO2(g) + 3 H2O(g) - Answer -b

When C4H8O4, tetrose, dissolves in water

A. each C4+, H+, and O2- ion is surrounded by water
B. each CH and OH- particles are surrounded by water
C. each CH and OH particles are surrounded by water
D. each C4H8O4 molecule is surrounded by water
E. tetrose does not dissolve in water - Answer -each C4H8O4 molecule is surrounded
by water

When Na2SO4(s) dissolves in water,

A. each of the Na, S, and O atoms is surrounded by water.
B. each of the Na+ and SO4^2- ions is surrounded by water.
C. each Na atom and SO4 molecule is surrounded by water.
D. each Na2SO4 unit is surrounded by water.
E. each Na+, S2-, and O2- ion is surrounded by water. - Answer -each of the Na+ and
SO4^2- ions is surrounded by water

What precipitate(s) form when mixing aqueous solutions of Ca2+, Cl-, CO32-, and NO3-
.

A. CaCO3
B. CaCO3 and CaCl2
C. Ca(NO3)2, CaCO3, and CaCl2
D. Ca(NO3)2 and CaCl2
E.No precipitates will form - Answer -CaCO3

Which of the following is least soluble in water?

A. K2CO3
B. KHCO3
C. Ca(HCO3)2
D. CaCO3
E. KNO3 - Answer -CaCO3

When dilute HCl is added to a solution, a white precipitate forms. Which ion was likely in
the solution?

A. Ag+
B. Cu2+
C. Na+
D. Ca2+
E. Sr2+ - Answer -Ag+