AnswersLA-Chemistry AIntroduction to Stoichiometry

Introduction to Stoichiometry — Unit test Answers

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1
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Which expression is equal to the number of milliliters (mL) in 12.5 liters (L)?

A
mc029-1.jpg
Option A
B
mc029-2.jpg
Option B
C
mc029-3.jpg
Option C
D
mc029-4.jpg
Option D
2
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Consider the reaction below.2Al2O3 4Al + 3O2How many moles of oxygen are produced if 11.0 mol of Al are produced?

Question illustration
A
8.25 mol
B
11.0 mol
C
14.7 mol
D
16.5 mol
3

What is the correct way to write 0.0000250 m in scientific notation?

A
2.50 10–5 m
Option A
B
2.5 10–5 m
Option B
C
2.50 10–4 m
Option C
D
2.5 10–4 m
Option D
4

Which statement best explains the purpose of using a mole in the measurement of matter?

A
It is commonly used as another unit of mass.
B
It allows chemists to deal with a large number of atoms.
C
It is used only for studying the properties of gases.
D
It explains that substances with the same moles have the same mass.
5

The pictures below show samples of different substances.The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?

Question illustration
A
No, because they have different masses.
B
No, because they have different volumes.
C
Yes, if each sample contains 6.02 x 1023 atoms.
D
Yes, if each sample contains 2 amu.
6

The following balanced equation shows the formation of sulfur dioxide.S + O2 SO2How many moles of sulfur are needed to produce 15.0 mol of sulfur dioxide?

Question illustration
A
7.50 mol
B
10.5 mol
C
15.0 mol
D
30.0 mol
7

A teacher describes a mathematical system that can be used to convert the weight of water to the mass of water. What is the teacher most likely describing?

A
fractions
B
different measuring tools
C
scientific notation
D
dimensional analysis
8

Rita divides Avogadro’s number (approximately 6.02214 1023) by 2.055 to calculate the number of atoms in a sample. Which expression gives her result to the correct number of significant figures?

Question illustration
A
2.93 1023
Option A
B
2.930 1023
Option B
C
2.9305 1023
Option C
D
2.93048 1023
Option D
9

Consider the equation below.Zn + H2SO4 ZnSO4 + H2The mole ratio of zinc to zinc sulfate is

Question illustration
A
1:1.
B
1:2.
C
2:1.
D
3:1.
10

What is the value of all conversion factors that are used in dimensional analysis?

A
1
B
10
C
3.0 108
Option C
D
6.02 1023
Option D
11

Juana performs the calculation below.6.05 + 3.156 + 5.0How should she report the answer using the correct number of significant figures?

A
14.206
B
14.21
C
14.2
D
14
12

Mary performs this calculation.How many significant figures should her answer have?

Question illustration
A
one
B
two
C
four
D
six
13

Mrs. Rushing has 3 chemistry classes with 24 students in each. An experiment calls for each student to use 4 test tubes. How many test tubes are needed in all for her classes?

A
32 test tubes
B
96 test tubes
C
288 test tubes
D
384 test tubes
14

Consider the balanced equation below. What is the mole ratio of PCl3 to PCl5?

Question illustration
A
1:1
B
2:1
C
3:5
D
5:3
15

Consider the substances below.• 1 mol of beryllium• 1 mol of salt• 1 mol of water• 1 mol of hydrogenWhich statement is true about these substances?

A
They have exactly the same mass.
B
They have different numbers of particles.
C
They have the same number of atoms.
D
They have different masses.

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