Chapter 17 - CHEMICAL CHANGE 17.1 – Chemical Reactions pp. 384-387.

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Chapter 17 - CHEMICAL CHANGE 17.1 – Chemical Reactions pp

17.1 Chemical Reactions A chemical reaction is the process of breaking of chemical bonds in one or more substances, and the reforming of new bonds to create new substances. When you make pizza, which changes are physical and which are chemical changes?

17.1 Evidence of chemical change Four indicators of chemical change are: 1. Formation of new gas 2. Formation of new solid 3. Release of energy (heat or light) 4. Color change

17.1 Products and reactants In chemical reactions, you start with reactants that are combined to make products.  The reactants are the starting substances.  The products are the new substances which result from the chemical reaction.

17.1 Reactants and products In the reaction, methane (a natural gas) is burned or combusted. Some energy is added to get the reaction started.

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