CHEM 120 WEEK 14 PRACTICE QUESTIONS AND ANSWERS| LATEST 2021:Chamberlain College of Nursing (100% SATISFACTIONS)

1. Question No. : (TCO 5) Which of the following factors will increase the rate of a
reaction?

Student Ans:
Adding more reactants

Increasing the temperature of the reaction

Adding a catalyst

Neither A, B, nor C will increase the rate of a reaction.

A, B, or C will increase the rate of a reaction.
Inst. Exp: Week 3 Lecture; Increasing the concentration of the reactants, increasing the
temperature of the reaction, & adding catalysts will increase the rate of a
reaction.

Pts. Received: 5 of 5
Comnts::




2. Question No. : (TCO 5) What coefficient is placed in front of O2 to complete the
balancing of the following equation?
C5H8 + ? O2 --> 5 CO2 + 4 H2O

Student
Ans: 1

3

5

6

7
Inst. Exp: Chapter 5; There are 14 oxygen atoms on the product side of the equation: ten from the 5
CO2 & four from the 4 H2O. Therefore, 7 O2 molecules are required on the reactant side to
balance the equation.

Pts. Received: 5 of 5
Comnts::




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 oxygen gas (O2) are needed to react with 4.0
moles of Mg?

Student Ans:
2.0 moles