Chemistry Reference
In-Depth Information
12. Identify the number of significant digits in each of the following
numbers.
a) 3009 b) 3.000 c) 0.0004 d) 4.500 x 10
8
13. Perform each of the following calculations and round to the correct
number of significant digits.
a) 53 + 3.59 c) 3.45 x 2.9
b) 76.32 - 34.9 d) (4.5 x 10
8
) / (3.42 x 10
5
)
14. What would be the mass of a 4.53 cm
3
sample of a material with a
density of 0.852 g/cm
3
?
15. How much space would a 0.434 g sample of a material occupy if it has
a density of 1.23 g/cm
3
?
Part III—Multiple Choice
For each of the following questions, select the best answer.
16. Which of the following shows SI prefixes from smallest to largest?
a) pico, milli, centi, nano c) milli, centi, nano, pico
b) pico, nano, milli, centi d) nano, pico, milli, centi
17. Which of the following is not an SI base unit?
a) ampere
b) kilogram
c) Newton
d) second
18. Which of the following represents the greatest volume of water?
a) 3.34 dm
3
b) 3412 ml
c) 9213 cm
3
d) 22.9 L
Part IV—Short Essay
Answer the following questions completely.
19. Explain the difference between mass and density.
20. Explain the difference between mass and weight.
Answer Key
The actual answers will be shown in brackets, followed by the explana-
tion. If you don't understand an explanation that is given in this section, you
may want to go back and review the lesson that the question came from.
