CHM 1025 Review Questions #I
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or
answers the question.
1) A set of procedures used to acquire knowledge and explain phenomena
1) _______
is ________.
A) known as the scientific method
B) collectively known as the field of science
C) required to establish natural law
D) referred to as technology
2) Which of the following statements is false?
A) Theories that are invented to explain certain facts are not subject to
change.
B) A theory is a hypothesis that is tested and validated over a period
of time.
C) Facts that have been verified by repeated experiments will never
be changed.
D) An experiment is a well-defined, controlled procedure for
obtaining facts.
2) _______
3) Chemistry is a scientific discipline which ________.
A) is devoted to the study of matter and energy
B) has only two subdisciplines
C) is a biological science
D) has a rigid boundary between itself and other disciplines
3) _______
4) Which statement contains an exact number?
A) One sheet of paper is 0.0042 inches thick.
B) A ream of medium weight paper weighs 20 pounds.
C) A gross of paper contains 144 sheets.
D) One sheet of paper measures 8.5 x 11 inches.
4) _______
5) Which of the following contain three significant figures, and no others?
I.
326.0
II. 0.00310
III. 46,900
IV. 1.070
V. 0.020
A) II, III and V
B) I, III and IV
C) II
D) IV and V
E) II and V
5) _______
6) Which of the following statements concerning the "significance" of zeros
in recorded measurements is incorrect?
A) leading zeros are never significant
B) confined zeros are always significant
C) trailing and leading zeros are not always significant
D) trailing zeros are not always significant
6) _______
7) The number 0.090804, when rounded off to 4 significant figures, would
appear as ________.
A) 0.091
B) 0.090800
C) 0.09080
D) 0.090
E) 0.0908
7) _______
8) The correct answer for the calculation
8) _______
where 126 and 135 are counted numbers and 1.364 and 0.8951 are
measured numbers is ________.
A) 1.42
B) 1.422
C) 1.42201
D) 1.4
E) 1.4220
9) A rubber band is found to weigh 0.0978 g. What is the total mass of 106
such identical rubber bands?
A) 10.28 g
B) 10.0 g
C) 10.3 g
D) 10 g
E) none of these
9) _______
10) Water and vitamin C were added to a beaker. Calculate the mass of the
beaker and its contents, and choose the answer with the appropriate
number of significant figures.
10) ______
146.20 g beaker + 23.1 g water + 0.34 g vitamin C =
A)
B)
C)
D)
E)
169 g
169.6 g
169.64 g
170 g
160 g
11) The number 12.68 x
becomes ________.
A) 0.1268 x
, when expressed in correct scientific notation,
11) ______
B) 0.1268 x
C) 1.268 x
D) 1268 x
E) 1.268 x
12) The correct answer obtained by dividing 4.65 x 10 5 by 9.4 x 10-2
tog ether is
________ 12)
.
A) 4.94 x
B) 2.0 x
___
___
C) 4.9 x
D) 2.02 x
E) 5.0 x
SHORT ANSWER. Write the word or phrase that best completes each statement or answers
the question.
13) How many significant figures are found in each of the following 13) _____________
measurements?
1) 300 grams
________
2) 0.0207 pound
________
3) 66,900,000 miles
________
4) 20.10 liters
________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or
answers the question.
14) In which of the following sequences are the metric system prefixes listed 14) ______
in order of decreasing size?
A) nano, milli, micro
B) micro, deca, centi
C) kilo, centi, nano
D) nano, micro, milli
E) hecto, kilo, deci
15) A cylindrical slug of copper has a diameter of 68.3 mm and a height of
0.120 m. What is the volume of the cylinder of copper in
volume: V = πr2h)
15) ______
? (cylinder
A) 18.2 cm3
B) 176 cm3
C) 1460 cm3
D) 4.40 ×
E) 702 cm3
16) 256 college students each donated one pint of blood. How many
milliliters of blood did the students donate?
A) 121,100 mL
B) 4865 mL
C) 6.84 ×
mL
16) ______
D) 16,574 mL
E) 3.89 ×
mL
17) The typical volume of an aluminum can of soda is 355 mL. What is the
equ ivalent
volume 17)
in
gallons?
A)
B)
C)
D)
E)
___
___
5.75 gal
0.673 gal
1.23 gal
0.0939 gal
3.37 x 105 gal
18) The density of an object is the ratio of its ________ to its ________.
A) mass; height
B) mass; density
C) length; mass
D) length; volume
E) mass; volume
18) ______
19) What volume of a solution with a density of 13.9 g/mL is needed to
provide 155 grams of solution?
A) 2150 mL
B) 0.185 mL
C) 106 mL
D) 11.2 mL
E) 0.0897 mL
19) ______
20) If object A weighs 24 grams and has a volume of 3 mL and object B
weighs 14 g and has a volume of 7 mL, ________.
A) B is half as dense as A
B) A is four times as dense as B
C) B is more dense than A
D) A and B have equal densities
20) ______
21) Which of the following is a property of both solids and liquids?
A) indefinite shape
B) definite shape
C) definite volume
D) indefinite volume
21) ______
22) Which statement best describes a sample of gas?
A) A gas has a definite volume, but its shape is determined by its
container.
B) The volume and the shape of a gas are determined by its container.
C) A gas has a definite volume and a definite shape.
D) The volume of a gas is determined by its container, but it has a
definite shape.
22) ______
23) The state of matter a substance is in is determined by its ________.
A) size
B) solubility
C) density
D) electrical conductivity
E) temperature
23) ______
24) Which of the following is a chemical change?
A) cutting a copper wire into two pieces
24) ______
B)
C)
D)
E)
dissolving salt in water
grating cheese
rusting of iron
evaporation of gasoline
25) Which of the following is a chemical property?
A) solubility
B) burning
C) mass
D) condensation
E) melting
25) ______
26) The condensation of steam is an example of a ________.
A) chemical change
B) change of state
C) intensive property
D) extensive property
E) sublimation
26) ______
27) Which answer includes all of the following that are chemical changes,
and no physical changes?
I. The cutting of an iron bar into smaller pieces.
II. The solidification of mercury by cooling.
III. The dropping of iron into hydrochloric acid, producing
hydrogen gas.
IV. The mixing of water and drinking alcohol.
V. The fermentation of grape juice.
A) III and V
B) I, II, III, IV, and V
C) I and IV
D) I, III, and IV
E) II, III, IV, and V
27) ______
28) Which of the following statements is correct?
A) Elements, but not compounds, are pure substances.
B) Compounds, but not elements, are pure substances.
C) Both elements and compounds are pure substances.
D) Neither elements nor compounds are pure substances.
28) ______
29) If a tablespoon of table salt is mixed with a tablespoon of water, the
resulting solution can be classified as a ________.
A) homogeneous pure substance
B) homogeneous mixture
C) pure substance
D) heterogeneous mixture
E) element
29) ______
30) Which of the following statements concerning the known elements is
true?
A) scientists "suspect" that there are more naturally occurring
elements to be discovered
B) 88 of the elements are naturally occurring
30) ______
C) no new elements have been identified within the last twenty years
D) 104 elements are known at present
31) The most abundant elements in the universe are ________.
A) helium and carbon
B) hydrogen and oxygen
C) hydrogen and helium
D) oxygen and iron
31) ______
32) How many joules of heat must be removed to lower the temperature of
a 36.5 g Al bar from 84.1 °C to 56.8 °C? The specific heat of Al is 0.908 J/g
°C.
A) 849 J
B) 905 J
C) 240 J
D) 1090 J
E) 581 J
32) ______
33) What is the heat capacity of 84.0 g of water? Specific heat of water =
4.184 J/g °C
A) 506 J/°C
B) 351 J/°C
C) 492J/°C
D) 20.1 J/°C
E) 96.8 J/°C
33) ______
34) How many grams of Ag can be heated from 23 °C to 36 °C when 22 g
of Au cools from 95.5 °C to 26.4 °C?
Specific heat of Ag = 0.240 J/(g °C) Specific heat of Au = 0.130 J/(g °C)
A) 104 g
B) 86 g
C) 47 g
D) 28 g
E) 63 g
34) ______
35) Calculate the mass of gold (0.130 J/g°C) that requires 468 J to heat the
metal from 21.6 °C to 33.2 °C?
A) 56.9 g
B) 315 g
C) 538 g
D) 814 g
E) 622 g
35) ______
36) How much energy is required to change 12.9 g of solid Cu to molten Cu
at 1083 °C (melting point)? Heat of fusion for Cu = 205 J/g
A) 3150
B) 2640
C) 7810
D) 1990
E) 1390
36) ______
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
17)
18)
19)
20)
21)
22)
23)
24)
25)
26)
27)
28)
29)
30)
31)
32)
33)
34)
35)
36)
A
A
A
C
C
C
C
B
C
B
C
C
1) 1
C
D
A
D
E
D
B
C
B
E
D
B
B
A
C
B
B
C
B
B
E
B
B
2) 3
3) 3
4) 4