Free GED SCIENCE Exam Braindumps
GED Section 3: Science Questions 81–85 (page: 18)

The Perfect Food Company makes Energy Bars for use as a meal replacement or diet supplement.

A Perfect Food Company spokesperson claims that Perfect's Energy Bar is superior to other nutritional bars.
Which explanation is most likely based on opinion rather than fact?

Based on the information provided, which group served as the control in the experiment?

Based on the information and diagram, which container has the most thermal energy?

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Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X rays, and gamma rays are forms of radiant energy that make up the electromagnetic spectrum. Each portion of the electromagnetic spectrum has waves that vary in frequency and wavelength, but all can be used by people. Radio waves can be used to carry music and voices for great distances through air, X rays can be used for diagnostic work in medicine, and infrared radiation can be used for heating and drying.


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What appears to be the difference in the waves when moving from radio waves to X rays in the electromagnetic spectrum?

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Since carbon dioxide dissolves in water to form an acid, an acid-base indicator such as bromthymol blue is used to track the acid concentration during plant photosynthesis and respiration. Bromthymol blue turns yellow in an acid solution and remains blue in a basic solution. The color change is reversible. A student used the following procedure to track carbon dioxide.
In an experiment, a student placed a solution of bromthymol blue into each of two flasks, inserted a drinking straw in each flask, and blew through the straw until the solution turned from blue to yellow. Carbon dioxide, a waste product in the student's breath, caused the color change. The student then placed a small Elodea water plant in each flask and closed the flasks with rubber stoppers. Flask A was placed in bright sunlight, while flask B was placed in the dark for 24 hours, as shown in the figure below.

After 24 hours, the bromthymol blue in flask A had turned back to blue, while in flask B it was still yellow.
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If living things use oxygen and release carbon dioxide during respiration, what is the most probable reason that the atmosphere does not become depleted of oxygen and become filled with carbon dioxide?