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Ch.3 Matter and Energy
Timberlake - Chemistry: An Introduction to General, Organic, and Biological Chemistry 13th Edition
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353Not the one you use?Change textbook
All textbooksTimberlake 13th EditionCh.3 Matter and EnergyProblem 58b
Chapter 3, Problem 58b

For the amount of exercise that Charles did for one week in part a, if expending 3500 kcal is equal to a loss of 1.0 lb, how many pounds did he lose?

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Step 1: Identify the relationship between calories expended and weight loss. The problem states that expending 3500 kcal corresponds to a loss of 1.0 lb.
Step 2: Determine the total number of calories Charles expended during the week. This information should be obtained from part a of the problem.
Step 3: Set up a proportion to calculate the weight loss. Use the relationship: \( \text{Weight Loss (lb)} = \frac{\text{Calories Expended}}{3500} \).
Step 4: Substitute the total calories expended from part a into the formula. Ensure the units are consistent (kcal).
Step 5: Simplify the expression to find the weight loss in pounds. This will give the result for how many pounds Charles lost during the week.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Caloric Deficit

A caloric deficit occurs when the number of calories burned exceeds the number of calories consumed. In the context of weight loss, creating a caloric deficit is essential, as it leads to the body utilizing stored fat for energy. Understanding this concept is crucial for calculating weight loss based on exercise and dietary intake.

Weight Loss Calculation

Weight loss can be quantified by understanding the relationship between calories burned and pounds lost. Specifically, a deficit of 3500 kcal is generally accepted as equivalent to losing 1 pound of body weight. This calculation allows individuals to estimate their weight loss based on their caloric expenditure from exercise.
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Exercise Energy Expenditure

Exercise energy expenditure refers to the number of calories burned during physical activity. This can vary significantly based on the type, intensity, and duration of the exercise performed. Accurately estimating this expenditure is vital for determining how much weight can be lost through exercise alone.
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Related Practice
Textbook Question

Using energy values from TABLE 3.8, determine each of the following:

c. If Charles consumes 1800 kcal per day, he will maintain his weight. Would he lose weight on his new diet?

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Textbook Question

Calculate the energy to heat two cubes (gold and aluminum) each with a volume of 10 cm3 from 15 °C to 25 °C. Refer to Tables 2.8 and 3.11.

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Textbook Question

After a week, biochemical reactions in compost slow, and the temperature drops to 45 °C. The dark brown organic-rich mixture is ready for use in the garden. What is this temperature in degrees Fahrenheit? In kelvins? (3.3)

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Textbook Question

A 70.0-kg person had a quarter-pound cheeseburger, french fries, and a chocolate shake.

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d. Using TABLE 3.10, determine the number of hours of running needed to burn off the kilocalories in this meal.

Textbook Question

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:

c. kilojoules needed to melt 24.0 g of ice at 0 °C, warm the liquid to 100 °C, and change it to steam at 100 °C

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Textbook Question

Using energy values from TABLE 3.8, determine each of the following:

d. If expending 3500 kcal is equal to a loss of 1.0 lb, how many days will it take Charles to lose 5.0 lb?