CHEMISTRY TEST REVIEW CH. 1 & 2
SOLUTIONS
Please answer the following in your composition book.
1. What is chemistry?
Chemistry is the study of matter.
2. How would your mass and weight differ on the Moon? (The gravitational force of the Moon is 1/6th the
gravitational force on Earth).
Your mass does not change regardless of where you are located. Your weight however, would be less on the Moon as
this celestial body exerts less gravitational force on you in comparison to the Earth.
3. What is the difference among a hypothesis, a theory, and a law?
A hypothesis is a probable statement made on what has been observed. A theory, however, is an explanation of a
natural phenomenon based on many observations and experiments. Finally, a law is a summary of accepted facts
regarding nature.
4. Label each of the following pieces of data as qualitative or quantitative: a) A beaker weighs 6.6 g, b) sugar
crystals are white and shiny, c) fireworks are colorful.
A) Quantitative
B) Qualitative C) Qualitative
5. What are the SI base units of measurements for mass, time, length, and volume?
Mass- kilogram, time- second, length- meter, volume- liter
6. What are the meanings of each the SI prefixes given in class?
See Table 2.2, p.33
7. On the Celsius scale, at what temperature does water freeze? Boil?
Freeze- 0°C, Boil 100°C
8. How does precision differ from accuracy? How can a set of measurements be precise, but not accurate? Give a
real-world example.
Precision indicates how close data points are to one another. Accuracy indicates how close data is to an accepted
value. Examples may vary.
9. How many significant digits are in the following?
a. 0.0910 m
b. 432 m
c.1.080 m
A) 3
B) 3
C) 4
10. The sum of 18.032 mm, 12.9 mm, and 14.11 mm is __________.
45.0
11. If you multiplied a number having 5 significant digits by a number having 2
significant digits , how many significant digits would the answer have?
2
12. Express 13000 in scientific notation. Express 0.000087 in scientific notation.
1.3 x 104 and 8.7 x 10-5
13. (7.1x108) (8.2x10-2)=
5.8 x 107
14. What are labels for speed, area and density?
m/s, m2, g/cm3
15. If you were given the mass of an object, and asked to find its volume, what other piece of information is
necessary to this problem?
In order to determine the volume of an object, you would need to know the mass AND the density of that object.
16. Convert 30 seconds to hours.
(30 s/1) (1 min/ 60 s) (1 hr/ 60 min)=8 x 10-3 hr
17. Convert 9 cm to km, 20 mm to m, 42 L to cm3.
(9 cm/1) (1 m/100 cm) (1 km/1000 m)= 9 x 10-5 km
(20 mm/1) (1 m/ 1000mm)= 2 x 10-2 m
(42 L/1) (1000 cm3/1L)= 4.2 x 104 cm3
18. What is the volume of a substance having a mass of 56 g and a density of 7 g/mL?
56 g/7 g/mL= 8 mL
19. What is the density of a substance having a mass of 106 g and a volume of 3 mL?
106 g/ 3 mL= 4 x 101 g/mL
20. What is the mass of a substance having a volume of 16 L and density of 9 g/mL?
(16000 mL) (9 g/mL)= 1 x 105 g