UNIT CONVERSION WORKSHEET #3
(Chemistry IB)
1. If an elevator moves 1340 ft to the 103rd floor of the Sears Tower in Chicago in 45 seconds, what is the
velocity (distance traveled divided by time) of the elevator in kilometers per hour?
2. The moon orbits the sun with a velocity of 2.2 × 104 miles per hour. What is this velocity in meters per
second?
3. Sound travels at a velocity of 333 m/s. How long does it take for sound to travel the length of a 100-yard
football field?
4. How many miles can a commercial jetliner flying at 253 meters per second travel in 6.0 hours?
5. A peanut butter sandwich provides about 1.4 × 103 kJ of energy. A typical adult uses about 95 kcal/hr of
energy while sitting. If all of the energy in one peanut butter sandwich were to be burned off by sitting, how
many hours would it be before this energy was used? (A kcal is a dietary calorie. There are 4.184 J/cal.)
6. One-third cup of vanilla ice cream provides about 145 kcal of energy. A typical adult uses about 195 kcal/hr
of energy while walking. If all of the energy in one-third of a cup of vanilla ice cream were to be burned off
by walking, how many minutes would it take for this energy to be used? (A kcal is a dietary calorie.)
7. When one gram of hydrogen gas, H2(g), is burned, 141.8 kJ of heat are released. How much heat is released
when 2.3456 kg of hydrogen gas are burned?
8. Normal blood contains from 3.3 to 5.1 mg of amino acids per 100 mL of blood. If a person has 5.33 L of
blood and 4.784 mg of amino acids per 100 mL of blood, how many grams of amino acids does the blood
contain?
9. The average heart rate is 75 beats/min. How many times does the average person’s heart beat in a week?
10. The average heart rate is 75 beats/min. Each beat pumps about 75 mL of blood. How many liters of blood
does the average person’s heart pump in a week?
11. In optimum conditions, one molecule of the enzyme carbonic anhydrase can convert 3.6 × 10 5 molecules per
minute of carbonic acid, H2CO3, to carbon dioxide, CO2, and water, H2O. How many molecules could be
converted by one of these enzyme molecules in one week?
12. In optimum conditions, one molecule of the enzyme fumarase can convert 8 × 10 2 molecules per minute of
fumarate to malate. How many molecules could be converted by one of these enzyme molecules in 30 days?
Answers:
1)
2)
3)
4)
5)
6)
33km/hr
9.8 x 103m/s
0.275s
3.4 x 103 miles
3.5 hrs.
44.6 min.
7) 3.3261 x 105kJ energy
8) 0.255g
9) 7.56 x 105 beats
10) 5.7 x 104dm3
11) 3.6 x 109 molecules
12) 3 x 107 molecules