3.2 Modeling Energy

What does it mean that energy is conceptual?

• It cannot be seen or touched, so is measured by what it does

• It cannot be seen, but is easily touched

• It takes up space and can be measured in volume

• It is closely associated with the concept of mass

What is the purpose of a chemical equation?

• To explain the energy involved in a state or composition of a substance

• To tell you which elements you are working with

• To explain the mysteries of the universe

• To define changes in heat between molecules

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A whole made up of different parts that work together to perform a function is referred to as a/an:

• System

• Machine

• Energy

• Network

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When do energy conversions occur?

• When heat transfers between objects

• When energy changes form

• When a system performs a function

• When matter changes into energy

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During chemical reactions, energy is (2):

• Absorbed

• Released

• Converted into heat

• Converted into matter

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When energy is absorbed, a bond is:

• Created

• Broken

• Reduced

• Increased

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When energy is released, a bond is:

• Created

• Broken

• Reduced

• Increased

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To create a bond, energy must be

• Absorbed

• Released

• Increased

• Decreased

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To break a bond, energy must be

• Absorbed

• Released

• Increased

• Decreased

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When energy is absorbed or released, it is usually in the form of: (2)

• Heat

• Light

• Radiation

• Ultraviolet

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