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Chapter 3: Q.3.85 (page 93)
A 0.50-g sample of vegetable oil is placed in a calorimeter. When the sample is burned, 18.9 KJ is given off. What is the energy value (kcal/g) for the oil?
energy value (kcal/g) for the oil is
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Indicate whether each of the following statements describes potential or kinetic energy?
a. water at the lop of a waterfall
b. kicking a ball
c. the energy in a lamp of coal
d. a skier at the top of a hill
Your friend, who has a mass of , has a slice of pizza, a cola soft drink, and ice cream.
a. Using Table, calculate the total kilocalories for each food type in this meal (round off the kilocalories to the tens place).
b. Determine the total kilocalories for the meal (round off to the tens place).
c. Using Table, determine the number of hours of sitting needed to burn off the kilocalories in this meal.
d. Using Table, determine the number of hours of swimming needed to burn off the kilocalories in this meal.
Classify each of the following pure substances as an element or a compound:
a. helium gas ()
b. sulfur ()
c. sugar
d. mercury () in a thermometer
e. lye ()
Calculate the kilocalories for each of the following:
one cup of popcorn that produceswhen burned in a calorimeter
a sample of butter that produces when burned in a calorimeter
Identify each of the following as an element, a compound, or a mixture. Explain your choice. (3.1)
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