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How is Chemical Energy related to Chemical Change?
Lesson 1.4
Energy & Matter       

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Key Concepts
  • What are some forms of energy that are related to changes in matter?
  • How is chemical energy related to chemical change?
Vocabulary
  • kinetic energy
  • potential energy
  • chemical energy
  • electromagnetic energy
  • electrical energy
  • electrodes
Chemical Energy
  • Compounds have potential energy stored in the chemical bonds between atoms.
  • This is a form of potential energy called chemical energy.
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Chemical Change
  • When a chemical change occurs, the bonds are broken and new bonds may form.
  • If the chemical change is exothermic, some of the chemical energy is released in other forms like thermal energy.
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Electromagnetic Energy
  • Chemical changes also release a form of energy called electromagnetic energy, which travels through space as waves.
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Light
  • Light is one kind of electromagnetic energy.
  • Other examples include radio waves, microwaves, and X-rays.

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Fire
  • Burning wood is a chemical change that gives off electromagnetic energy and thermal energy.
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Effects of Electromagnetic Energy
  • Electromagnetic energy can also cause matter to change.
  • For example, a microwave oven can change a frozen block of spaghetti and sauce into a hot meal - a physical change.
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Electrical Energy
  • The energy of electrically charged particles moving from one place to another is called electrical energy.
  • In many chemical changes, electrons move from one atom to another.
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Electrolysis
  • Another chemical change, electrolysis, involves electrical energy.
  • In electrolysis, two metal strips called electrodes are placed in a solution.
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Chemical Energy
  • Every time matter changes, energy is involved.
  • During a chemical change, chemical energy may be changed to other forms of energy.
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Converting to Chemical Energy
  • Other forms of energy may also be changed to chemical energy.
  • One important example of energy change is photosynthesis.
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Photosynthesis
  • In photosynthesis, plants change electromagnetic energy from the sun into chemical energy as they make sugar.
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 Energy for Life
  • These plants, as well as the animals that eat them, change this chemical energy into energy needed for life activities.


Lab 1.4 Electrolysis
Quiz 1.3
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