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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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Calculate the heat change at . for each of the following. and indicate whether heat was absorbed/released:
a. calories to freezeof water
h. joules to freeze of water
c. kilocalories to melt of ice
d. kilojoules to melt of ice
Classify each of the following as a homogeneous or heterogeneous mixture:
Identify each of the following as solid, liquid, or gas:
a. vitamin tablets in a bottle
b. helium in a balloon
c. milk in a bottle
d. the air you breathe
e. charcoal briquettes on a barbecue
Indicate whether each of the following describes a gas, a liquid, or a solid:
a. Lemonade has a definite volume but takes the shape of its container.
b. The particles in a tank of oxygen are very far apart.
c. Helium occupies the entire volume of a balloon.
Using the energy values for foods (see Table), determine each of the following (round off the answer for each food type to the tens place):
(a) the total kilojoules for one cup of orange juice that contains 26 g of carbohydrate, no fat, and of protein
(b) the grams of carbohydrate in one apple if the apple has no fat and no protein and provides of energy
(c) the kilocalories in one tablespoon of vegetable oil, which containsof fat and no carbohydrate or protein
(d )the grams of fat in one avocado that has , of carbohydrate, and of protein
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