CHAPTER 1 The Science of Chemistry 1.3 Matter and Energy.

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Presentation transcript:

CHAPTER 1 The Science of Chemistry 1.3 Matter and Energy

Key Questions: What does “conserving” energy mean? Are we really “running out” of energy? Can you name at least three forms of energy?

3 1.3 Matter and Energy A bicycle contains many kinds of matter.

4 1.3 Matter and Energy Matter is anything that has mass and takes up space. Physical forms (phases) of matter Matter

5 1.3 Matter and Energy Energy Whether matter is solid, liquid, or gas depends on how much internal thermal energy is associated with its constituent molecules and atoms

6 1.3 Matter and Energy law of conservation of energy: law of nature that states that energy can never be created or destroyed, just converted from one form into another. Mechanical energy Potential energy Kinetic energy

7 1.3 Matter and Energy Chemical energy Electrical energy Thermal energy Mechanical energy Energy conversion

8 1.3 Matter and Energy Energy is not created but converted from one form to another.

9 1.3 Matter and Energy If energy cannot be destroyed, why are we encouraged to “conserve energy”?

Matter and Energy What we say What we mean “We use energy by turning on a light.”

Matter and Energy What we say What we mean “We use energy by turning on a light.” “We use one form of energy (electricity) by turning on a light.”

Matter and Energy What we say What we mean “We use energy by turning on a light.” “We use one form of energy (electricity) by turning on a light.” “Electric power plants make electrical energy.”

Matter and Energy What we say What we mean “We use energy by turning on a light.” “We use one form of energy (electricity) by turning on a light.” “Electric power plants make electrical energy.” “Electric power plants convert other forms of energy (solar, nuclear) into electrical energy.”

Matter and Energy What we say What we mean “We use energy by turning on a light.” “We use one form of energy (electricity) by turning on a light.” “Electric power plants make electrical energy.” “Electric power plants convert other forms of energy (solar, nuclear) into electrical energy.” “We are running out of energy.”

Matter and Energy What we say What we mean “We use energy by turning on a light.” “We use one form of energy (electricity) by turning on a light.” “Electric power plants make electrical energy.” “Electric power plants convert other forms of energy (solar, nuclear) into electrical energy.” “We are running out of energy.” “We are running out of certain forms of energy (oil, gas).”

Matter and Energy law of conservation of energy: - energy can never be created or destroyed - energy can just be converted from one form into another Physical states of matter

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