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A particular frost-free refrigerator uses about 745 kWh of electrical energy per year. Express this amount of energy in each unit. a. J b. kJ
8. Thermochemistry
Nature of Energy
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Which of the following includes all energy-yielding substances?
A
Vitamins and minerals
B
Carbohydrates, fats, and proteins
C
Water and fiber
D
Nucleic acids and enzymes
Verified step by step guidance1
Identify the primary macronutrients that provide energy to the body. These are carbohydrates, fats, and proteins.
Understand that vitamins and minerals, while essential for various bodily functions, do not directly provide energy.
Recognize that water and fiber are important for health but do not yield energy.
Note that nucleic acids and enzymes are involved in cellular processes but are not energy sources themselves.
Conclude that the substances that yield energy are carbohydrates, fats, and proteins, as they are metabolized to produce ATP, the energy currency of the cell.
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