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Chemical Reactions Glencoe Chapter 23
I. Chemical reactions change substances
Substances undergo chemical changes to become new substances
A. Signs of a chemical reaction1. Production of gas or smoke2. Change in color (not like painting a fence)3. Change in temperature without heating or cooling4. Production of a solid from two liquids
I. Chemical reactions change substances
B. Chemical reactions rearrange atoms to form new substances
Chemical Reaction - the process in which one or more substances are changed into new substances
1. Reactants beginning materials / substances that undergo a chemical change
2. Products ending materials / substances that are formed as a result of a chemical change
II. Energy and Reactions
A. Energy added to a compound to break chemical bonds
B. Energy released from a compound to form chemical bonds
C. Exothermic reactions – reactions that release energy (usually in the form of heat and/or light)
D. Endothermic reactions – reactions that absorb energy (usually get colder during the reaction)
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