1. Exothermic and Endothermic Reactions
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Chemical Reactions
All chemical reactions involve bond breaking and bond forming.
Energy is needed to break bonds and released when bonds are formed.
Chemical reactions are accompanied by a change in energy, mainly in the form of heat.
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3. Exothermic and Endothermic Reactions
A reaction in which heat is given out is exothermic.
A reaction in which heat is taken in is endothermic.
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4. Endothermic and exothermic reactions
Step 1: Energy must be SUPPLIED to break chemical bonds:
Step 2: Energy is RELEASED when new chemical bonds are made:
A reaction is EXOTHERMIC if more energy is RELEASED than SUPPLIED. If more energy is SUPPLIED than is RELEASED then the reaction is ENDOTHERMIC
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5. Endothermic process: a change (e. g
Endothermic process: a change (e.g. a chemical reaction) that requires (or absorbs) heat.
Forming Na+ and Cl- ions from NaCl is an endothermic process
Photosynthesis is an endothermic reaction (requires energy input from sun)
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Measuring Heat
reaction
Endothermic reaction, heat taken in & temperature of the substance drops
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7. EXOTHERMIC & ENDOTHERMIC REACTIONS
Exothermic process: a change (e.g. a chemical reaction) that releases heat.
Burning fossil fuels is an exothermic reaction
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8. Heat Released
reaction
Exothermic reaction, heat given off & temperature of substance rises.
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Examples
Exothermic
Combustion of fuels
Yeast & Hydrogen Peroxide
Epson salts & water
Endothermic
Photosynthesis
Acedic Acid & Sodium Bicarbonate
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