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Chapter 3: Q.3.15 (page 70)
Your friend who is visiting from Canada just took her temperature. When she reads 99.8F, she becomes concerned that she is quite ill. How would you explain this temperature to your friend?
The temperature in Celcius is and slightly higher than normal
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3.1 Classify each of the following pure substances as an element or a compound:
a. a silicon () chip
b. hydrogen peroxide
c. oxygen gas
d. rust
e. methane
The label of an energy bar with a mass of lists the nutrition facts as of carbohydrate, of fat, and of protein.
Using the energy values for carbohydrates, fats, and proteins (see Table), what are the total kilocalories listed for the energy bar? (Round off answers for each food type to the tens place.)
What are the kilojoules for the energy bar? (Round off answers for each food type to the tens place.)
If you obtain , how many grams of the energy bar did you eat?
If you are walking and using energy at a rate of , how many minutes will you need to walk to expend the energy from two energy bars?
A-kg person had a quarter-pound cheeseburger, french fries, and a chocolate shake.
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 sleep needed to burn off the kilocalories in this meal.
d. Using Table , determine the number of hours of running needed to burn off the kilocalories in this meal.
A dietitian includes one of the following mixtures in the lunch menu. Classily each as homogeneous or heterogeneous.
a. nonfat milk
b. chocolate-chip ice cream
c. peanut butter sandwich
d. cranberry juice
Using the values for the heat of fusion, specific heat of water. and/or heat of vaporization, calculate the amount of heat energy in each of the following:
a. joules released when of steam at condenses and cools to liquid at
b. kilocalories needed to melt a ice sculpture at and to warm the liquid to
c. kilojoules released when of steam condenses at , cools, and freezes at
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