CHEM 120 WEEK 3 PRACTICE QUESTIONS AND ANSWERS| LATEST 2021:Chamberlain College of Nursing (100% SATISFACTIONS)

CHEM 120 WEEK 3 PRACTICE QUESTIONS AND ANSWERS
(TCO 5) A reaction that releases energy as it occurs is classified as
Question No. : a(n) _____.
1.

Student Ans:
catalyzed reaction

exothermic reaction

decomposition reaction

endothermic reaction

oxidation-reduction reaction
Inst. Exp: Week 3 Lecture; Reactions that release energy are exothermic.

1931785666 MultipleChoice 1 True

0 1931785666 MultipleChoice 1

2. Question No. : (TCO 5) What should be the coefficient of hydrogen, H2, in the following
equation in order to make it balanced?
2 Al + 3 H2SO4 ---> Al2(SO4)3 + ? H2

Student
Ans: 5

1

4

2

3
Inst. Exp: Chapter 5; There are 6 hydrogens on the reactant side of the equation from the 3 H 2SO4
molecules. There must be 6 hydrogens on the product side, as well. Therefore, there are
3 H2.

1931785667 MultipleChoice 5 True

0 1931785667 MultipleChoice 5

3. Question No. : (TCO 5) Magnesium reacts with oxygen to form magnesium oxide &
has the following balanced chemical equation: 2 Mg + O 2 --> 2 MgO.
How many mole(s) of MgO are produced when 0.20 mole O2 reacts
completely?

Student
Ans: 0.20 mole

0.40 mole