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What is a Chemical Change?

What is a Chemical Change?. A chemical change is the process by which one or more substances change into entirely new substance. Burning is a chemical change; flammability is a chemical property. Look for the Signs How can you tell a chemical change has happened?.

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What is a Chemical Change?

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  1. What is a Chemical Change? • A chemical changeis the process by which one or more substances change into entirely new substance. • Burning is a chemical change; flammability is a chemical property.

  2. Look for the SignsHow can you tell a chemical change has happened? • There are several signs that a chemical reaction has occurred. • Observing two or more of these signs during a change means you are likely observing a chemical change.

  3. Odors can be produced during a chemical change. • Fizzingand foaming may mean gases are being produced. • The production of gas is often evidence of a chemical change. • Boiling also can produce gas bubbles, but boiling is a physical change.

  4. The formation of a precipitate can indicate a chemical change. • A precipitate is a solid that falls out of solution. • Energy changes from one form to another can be evidence of a chemical change. • Changes in temperature and color can be signs of a chemical change.

  5. Chemical Changes of Matter

  6. How can you tell a chemical change has happened? • Will heating the water in this beaker cause a physical or chemical change?

  7. How can you tell a chemical change has happened? • The only way to be sure that a chemical change has occurred is to test the composition of a sample before and after the change.

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