Chem 121
Ch. 1 Worksheet
You may work with a partner and use your textbook and a calculator. This worksheet will not be
graded, but you may want to write out all your work for practice and future reference. Make
sure your answer has the correct units and number of significant figures.
1. Which quantity in each pair is larger?
a. 100 cm or 100 dm
b. 5 mL or 5 L
c. 20 s or 20 ms
d. 5 mg or 5 kg
2. How many significant figures does each number contain?
a. 6.02 x 1023
b. 00033256
c. 0.0056
d. 12.095
3. Carry out the following calculations and give the answer with the correct number of
significant figures.
a. 23.1 x 0.1
b. 23000/0.211
c. 99.999 – 4.5
d. 12.3 + 4. 3454
4. Write the following quantities in scientific notation, using base units (m, g, L, sec)
a. 1,234,000 m
b. 0.0345 kg
c. 2,480 ml
d. 36,690 sec
5. How many grams does an 8.0 pound infant weigh?
6. If a recipe calls for 200 grams of flour, how many ounces do you need?
7. If a person donates a quart of blood, how many mL did they lose?
8. If you are 5 feet, 10 inches tall, how tall are you in cm?
9. If gasoline has a density of 0.66 g/mL, what is the mass (in kilograms) of one gallon?
10. Water and chloroform are insoluble. Water has a density of 1.00 g/mL, and chloroform has a density
of 1.49 g/mL. If you put both liquids in the same beaker, which one will be on top and which will be on
the bottom?