Q: Pyramids of net production and biomass reflect what level of efficiency? Read this paragraph and choose the correct option from the provided answers: Choices: - high - medium - extreme - low A:
low
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Q: To undo the tarnish on copper pennies, you can place them in what liquid? Read this paragraph and choose the correct option from the provided answers: Because chemical changes produce new substances, they often cannot be undone. For example, you can't change a fried egg back to a raw egg. Some chemical changes can be reversed, but only by other chemical changes. For example, to undo the tarnish on copper pennies, you can place them in vinegar. The acid in the vinegar reacts with the tarnish. This is a chemical change that makes the pennies bright and shiny again. You can try this yourself at home to see how well it works. Choices: - distilled water - honey - seawater - vinegar A:
vinegar
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Q: Inside a cylinder, thermal energy is converted to what type of energy of the moving piston? Read this paragraph and choose the correct option from the provided answers: Thermal energy is converted to the kinetic energy of the moving piston inside the cylinder. The moving piston, in turn, can be used to turn a turbine or do other useful work. Choices: - residual energy - horsepower - electrochemical energy - kinetic energy A:
kinetic energy
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Q: The sum of the kinetic and potential energies of a system's atoms and molecules is called what? Read this paragraph and choose the correct option from the provided answers: Internal energythe sum of the kinetic and potential energies of a system's atoms and molecules. Can be divided into many subcategories, such as thermal and chemical energy. Depends only on the state of a system (such as its P , V , and T ), not on how the energy entered the system. Change in internal energy is path independent. Choices: - mechanical energy - used energy - stored energy - internal energy A:
internal energy
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