Energy Basics

Chemical changes and their accompanying changes in energy are important parts of our everyday world. The macronutrients in food (proteins, fats, and carbohydrates) undergo metabolic reactions that provide the energy to keep our bodies functioning. We burn a variety of fuels (gasoline, natural gas, coal) to produce energy for transportation, heating, and the generation of electricity. Industrial chemical reactions use enormous amounts of energy to produce raw materials (such as iron and aluminum). Energy is then used to manufacture those raw materials into useful products, such as cars, skyscrapers, and bridges.

Q. An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.

Chemical reactions are accompanied by important energy changes that humans rely on.

Select All the Correct Answers:
Chemical changes are necessary for life on Earth
Metabolic reactions in the nutrients in food supply the energy humans need
Gasoline, natural gas, and coal are some forms of fuel that we use
In order to produce raw materials, we require the energy from industrial chemical reactions
Raw materials are used to produce cars, skyscrapers, and bridges


15 Reading Questions for TOEFL Prep - Group 4

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