Ch. 5, 11, 6 conversion factor, light, moles **test ** [55 points] Chemistry

Show your work in an organized manner, includes any relevant equation / formula, proper units in your work / answer, and the proper number of significant figures in your answer.

1. conversion factor. [15 points]

a. 75 µL = __ L

b. 45 mm

^{2}= ___ cm^{2}c. 7.0 meter / second = __ kilometer / hour

2. scientific notation & significant figures [10 points]

a. 27.0 ÷ 13 = __________________

b. 537.1675 + 218.69 = __________________

c. 0.000516 = ________________________ [write in scientific notation]

d. 769103 = __________________________ [write in scientific notation]

e. (23.7 * 10

^{8}) * (1.6 * 10^{2}) = ___________________ [write in scientific notation]

3. Write the following types of light in ascending order (i.e. small to big) in terms of energy: yellow, radiowaves, ultraviolet, and blue. [5 points]

4. moles [15 points]

a. 7.0 g Na

_{2}CO_{3}= ___ moles Na_{2}CO_{3}b. 57 mM C

_{2}H_{5}OH = __ grams C_{2}H_{5}OHc. 28.71 * 10

^{20}CO_{2}molecules = ___ grams CO_{2}