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CHEM 121 - Test 1 Review

Total questions: 20

Worksheet time: 23mins

Name
Class
Date
1.

Select the best statement

a)

Physical changes may be reversed by changing the temperature

b)

Physical changes alter the composition of the substances involved

c)

Physical properties are not valid characteristics for identifying a substance

d)

Physical properties are mostly extensive in nature

e)

Physical changes are usually accompanied by chemical changes

2.

Water vapor is less dense than ice because

a)

molecules in the gas phase are in constant motion

b)

molecules in the gas phase have more potential energy than in solids

c)

molecules in the gas phase have more kinetic energy than in solids

d)

gaseous molecules have less mass

e)

molecules in the gas phase have more space between them than in solids

3.

A scientist made careful measurements of the pressure and temperature of many different gases. Based on these measurements, he concluded that "the pressure of a fixed amount of gas, measured at constant volume, is directly proportional to its absolute temperature." This statement is best described as a

a)

theory

b)

hypothesis

c)

law

d)

experiment

e)

definition

4.

The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms?

a)

5.5 x 108 kg

b)

5.5 x 105 kg

c)

5.5 x 10-4 kg

d)

5.5 x 10-6 kg

e)

5.5 x 10-1 kg

5.

Given that 1 inch = 2.54 cm, 1 cm3 is equal to

a)

16.4 in3

b)

6.45 in3

c)

0.394 in3

d)

0.155 in3

e)

0.0610 in3

6.

Which of the following is not an S.I. base unit?

a)

meter

b)

ampere

c)

second

d)

gram

e)

Kelvin

7.

Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas, boils at 56.1 oC. What is the boiling point in degrees Fahrenheit?

a)

159 oF

b)

133 oF

c)

101 oF

d)

69.0 oF

e)

43.4 oF

8.

Which measurement is expressed to 4 significant figures?

a)

0.423 kg

b)

24.049 cm

c)

1300 K

d)

82,306 m

e)

62.40 g

9.

The difference between a student's experimental measurement of the density of sodium chloride and the known density of this compound reflects the _____ of the student's result

a)

accuracy

b)

precision

c)

random error

d)

systematic error

e)

indeterminate error

10.

J.J. Thomson studied cathode ray particles (electrons) and was able to measure the mass/charge ratio. His results showed that

a)

the mass/charge ratio varied when the cathode material was changed

b)

the charge was always a whole-number multiple of some minimum charge

c)

matter included particles much smaller than the atom

d)

atoms contained dense areas of positive charge

e)

atoms are largely empty space

11.

The Millikan oil-drop experiment

a)

established the charge on an electron

b)

showed that all oil drops carried the same charge

c)

provided support for the nuclear model of the atom

d)

suggested that some oil drops carried fractional numbers of electrons

e)

suggested the presence of a neutral particle in the atom

12.

Which of the following symbols does not represent an element?

a)

O2

b)

Co

c)

HF

d)

Cs

e)

Xe

13.

In the modern periodic table, the order in which the elements are placed is based on

a)

atomic mass

b)

atomic size

c)

mass number

d)

atomic number

e)

chemical reactivity

14.

Which of the following is a metal?

a)

Nitrogen

b)

Phosphorus

c)

Arsenic

d)

Thallium

e)

Silicon

15.

Which of the following compounds is covalent?

a)

CaCl2

b)

MgO

c)

Al2O3

d)

Cs2S

e)

PCl3

16.

Barium fluoride is used in embalming and in glass manufacturing. Which of the following gives the formula and bonding for barium fluoride

a)

BaF2, ionic

b)

BaF2, covalent

c)

BaF, ionic

d)

BaF, covalent

e)

Ba2F, ionic

17.

What is the name of Na2O?

a)

disodium monoxide

b)

sodium monoxide

c)

sodium dioxide

d)

sodium (I) oxide

e)

sodium oxide

18.

Zinc acetate is used in preserving wood and in manufacturing glazes for porcelain. What is its formula?

a)

ZnAc2

b)

ZnCH3COO

c)

Zn(CH3COO)2

d)

Zn2CH3COO

e)

ZnCH3COCH3

19.

What is the formula for magnesium sulfide?

a)

MgS

b)

MgS2

c)

Mg2S3

d)

Mg2S

e)

MgSO4

20.

The compound P4S10 is used in the manufacture of safety matches. What is its name?

a)

phosphorus sulfide

b)

phosphoric sulfide

c)

phosphorus decasulfide

d)

tetraphosphorus decasulfide

e)

phosphorus pentasulfide

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