Houston Community College System
Chemistry 1305
Exam 1
HOUSTON COMMUNITY COLLEGE
CHEM 1305
Name: _____________________
Exam # 1 (Chap. 1- 4)
Score:
PART I – Multiple choice: (3 points each)
1) Which of the following is the basic unit of volume in the metric system?
A) cubic meter
B) kilogram
C) liter
D) cubic centimeter
E) gram
2) The measurement 0.000 0043 m, expressed correctly using scientific notation, is
A) 4.3 07 m .
B) 4.3 6 m .
C) 4.3 6 m
D) 0.43 5 m
E) 4.3 m.
3) Which of the following conversion factors is a measured number?
A) 10 cm/dm
B) 12 in/ft
C) 16 oz/lb
D) 25 miles/gallon
E) 12 eggs/dozen
4) The measurement of the gravitational pull on an object is its
A) volume.
B) weight.
C) mass.
D) length.
E) size.
5) There is more traffic between 8 and 9 in the morning because most people start work at 9. This would be
a(n) ________.
A) observation
B) hypothesis
C) experiment
D) theory
E) all the above
6) Which of the following measurements has three significant figures?
A) 0.005 m
B) 510 m
C) 0.510 m
D) 0.051 m
E) 5100 m
7) A calculator answer of 423.6059 must be rounded off to three significant figures. What answer is reported?
A) 423
B) 424
C) 420
D) 423.6
E) 423.7
8) What is the correct answer for the calculation of a volume (in mL) with measured numbers
A) 0.22 mL
B) 0.223 mL
C) 57 mL
D) 14 mL
E) 14.3 mL
9) When 2610 + 11.7 + 0.22 are added, the answer to the correct answer is
A) 2600
B) 2621.9
C) 2622
D) 2621
E) 2621.92
10) Which of the following measurements are NOT equivalent?
A) 25 mg = 0.025 g
D) 84 cm = 8.4 mm
B) 183 L = 0.183 KL
E) 24 dL = 2.4 L
C) 150 msec = 0.150 sec
28.58
?
16 8.02
11) Which of the following is the largest unit?
A) millimeter
B) micrometer
C) meter
D) decimeter
E) kilometer
12) What is the metric relationship between grams and micrograms?
A) 1 g = 100 μg
D) 1 g = 1000 μg
B) 1 g = 1 000 000 μg
E) 1 g = 0.001 μg
C) 1 g = 0.000 001 μg
13) What is the conversion factor for the relationship between millimeters and centimeters?
A) 1 mm/1 cm
B) 10 mm/1 cm
C) 1 cm/1 mm
D) 100 mm/1 cm
E) 10 cm/1 mm
14) The cubic centimeter ( cm3 or cc) has the same volume as a
A) cubic inch.
B) cubic liter.
C) milliliter.
D) centimeter.
E) cubic decimeter.
15) Which of the following setups would convert centimeters to feet? ( 1 ft = 12 in; 1 in = 2.54 cm)
2.54 in.
1 ft

1 cm
12 in.
1 in.
1 ft

C) cm 
2.54 cm 12 in.
2.54 cm
1 ft

E) cm 
1 in.
12 in.
2.54 cm 12 in.

1 in.
1 ft
1 in.
12 in.

D) cm 
2.54 cm
1 ft
A) cm 
B) cm 
16) Air is a(n)
A) compound.
D) solution.
B) heterogeneous mixture.
E) none of the above
C) element.
17) Au is the symbol for
A) gold.
B) silver.
C) argon.
D) aluminum.
E) sodium.
18) Which one is a metalloid:
A) Al
B) K
C) Fe
D) C
E) Po
19) On a hot day, the thermometer read 95 °F. What is the temperature in degrees Celsius?
A) 77 °C
B) 113 °C
C) 35 °C
D) 63 °C
E) 178 °C
20) What is the total number of atoms in the chemical formula of iron (III) carbonate, Fe2(CO3)3?
A) 6
B) 14
C) 16
D) 20
E) none of the given answers are correct
PART II – Show All Your Work: (8 points each)
1) a. If a marathon race is 25.0 miles, what is the distance in kilometers? (Given: 1 mile = 1.61 kilometer) – 4 pt
b. How many pounds are in 3.5 kg? (Given: 1 lb = 454 g) – 4 pt
3
2) a. A piece of tin foil has a volume of 0.64 mm . If the piece measures 10. mm by 13 mm, what is the
thickness of the foil in mm? – 4 pt
b. A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a volume of
77.0 mL. What is the density of the gold? - 4pt
3
3) a. If the density of silver is 11 g/cm , what would be the mass of a 55 cm3 sample of silver? – 4pt
b. What is the mass of 2.00 L of an intravenous glucose solution with a density of 1.15 g/mL? – 4pt
4) a. Rubbing alcohol freezes at -128.7°F. What is the freezing point on the Celsius scale? – 4pt
b. N,N-dimethylaniline, C6H5N(CH3)2, which is used to make dyes, melts at 2.5 °C. What is N,N-dimethylaniline’s melting point
in °F and K? – 4 pt
5) While you are at rest, your brain gets about 15% by volume of your blood. If your body
contains 5.2 L of blood, how many liters of blood are in your brain at rest? How many quarts?
(Given: 1 qt = 1.057 L)
BONUS QUESTIONS – Show All Your Work: (5 points each)
a. If a penny has a mass of 2.20 g and is 2.5% copper, what is the mass of zinc in the coin?
b. The density of water at 0 °C is 0.99987 g/mL. What is the mass in kilograms of 185.0 mL of water?
Answer Key
Part I- Multiple Choice
1) C
8) A
15) C
2) B
9) C
16) D
3) D
10) D
17) A
4) B
11) E
18) E
5) B
12) B
19) C
6) C
13) B
20) B
7) B
14) C
Part II- Show Your Work - REDO
1) a. 26.2 mi × (1.61 km/1 mi) = 42.2 km
2) V(mm3)= L (mm) × W (mm) × T( mm) => T(mm)= 0.645 mm3/(10.00 mm × 12.50 mm)= 5.0 × 10-3 mm
3) d= m/V => m= 10.5 g/cm3 × 100 cm3= 1050 g
4) (°F – 32 °F) × (100 °C/180 °F)= °C => -89.4 °C
5) Law of Conservation of Mass:
Na + Cl→ NaCl
0.230 g + 0.355 g= 0.585 g NaCl
Bonus Question:
%= (g Cu/ Total Sample) × 100%
(2.5/ 100)= g Cu/ 2.507 => 0.0627 g Cu
Zn= 2.507 g(Sample)- 0.0627 g(Cu)= 2.44 g