CHEMISTRY FOR TODAY W/ ACCESS
8th Edition
ISBN: 9781337042802
Author: Seager
Publisher: CENGAGE C
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One hour of bicycle racing can require 500-900 kcal of energy, depending on the speed of the race, the terrain, and the weight of the racer. Tour de France riders must consume abnormal amounts of food to supply this energy. Food in the form of protein or carbohydrates produces 17.0 kJ of energy per gram consumed. How many kilograms of protein or carbohydrate must be consumed to provide the energy for 195 minutes of racing that requires 650.0 kcal/hr. (Recall 1 kcal = 4.184 kJ)
Assume that an apple contains 22 g of carbohydrates and has no fat or protein. The typical energy value for carbohydrates is 17 kJ/g or 4 kcal/g. How much energy, in kcal, is present in the apple?
a)374 kcal
b)5.5 kcal
c)93.5 kcal
d)88 kcal
What does a bomb calorimeter measure?
a.
How much energy the body expends during strenuous exercise
b.
The potential energy in foods
c.
Basil metabolism
d.
How changes in the environment affect the body’s hormone status
e.
How much energy the body expends during daily activities
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- What if energy was not conserved? How would this affect our lives?arrow_forwardCalculate the amount of carbon dioxide (in kg) emitted into the atmosphere by the complete combustion of a 15.0 gallon tank of gasoline. Do this by following these steps: Assume that gasoline is composed of octane (C8H18). Write a balanced equation for the combustion of octane. Determine the number of moles of octane contained in a 15.0 gallon tank of gasoline (1 gallon = 3.78 L). Octane has a density of 0.79 g/mL. Use the balanced equation to convert from moles of octane to moles of carbon dioxide, then convert to grams of carbon dioxide, and Finally to kg of carbon dioxide.arrow_forwardOne way to lose weight is to exercise! Walking briskly at 4.0 miles per hour for an hour consumes about 400 kcal of energy. How many hours would you have to walk at 4.0 miles per hour to lose one pound of body fat? One gram of body fat is equivalent to 7.7 kcal of energy. There are 454 g in 1 lb.arrow_forward
- A teaspoon of the carbohydrate sucrose (common sugar) contains 16 Calories (16 kcal). What is the mass of one teaspoon of sucrose if the average number of Calories for carbohydrates is 4.1 Calories/g?arrow_forwardThe human body may seem to be a perfectly efficient system, but there is a source of energy input, to keep a human body running at maximum efficiency. This energy comes from: A. sleep B.food C.exercise D.UV radiationarrow_forwardUse the information and chemical equation to answer the following question. A team of chemists discovers a new chemical reaction. 2NaCl + MgF2 → 2NaF + MgCl2 Which type of reaction will this equation be classified as?arrow_forward
- Consider the transportation sector. What impact will new technology have on this sector during the next ten years?arrow_forwardOne individual, weighing 105 lbs, bikes to work one day a week. Their round trip to work is 6 miles. They save 12.5 gallons annually by biking one day a week. Solve for the amount of calories they burn.arrow_forwardThe primary use of ingested proteins in the body is to _____. be broken down into amino acids that are used to build proteins and nucleic acids within the body be broken down to release energy and the unused components are recycled to build new proteins within the body interact with signaling molecules to trigger the building of muscle fibers be converted to starches or sugars, which are more readily accessible forms of energyarrow_forward
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