1. Exothermic and Endothermic Reactions
Endothermic & Exothermic Reactions, Fremont 2013
Exothermic and Endothermic Reactions
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2. Forming Na+ and Cl- ions from NaCl is an endothermic process
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)

3. Measuring Heat
reaction
Endothermic reaction, heat taken in & temperature of the substance drops

4. Ammonium nitrate + water

5. Starting temperature 20⁰ C

6. Add ammonium nitrate to water

7. a temperature decrease of 8⁰ C

8. EXOTHERMIC & ENDOTHERMIC REACTIONS
Exothermic process: a change (e.g. a chemical reaction) that releases heat.
Burning fossil fuels is an exothermic reaction

9. Exothermic reaction, heat given off & temperature of substance rises.
Heat Released
reaction
Exothermic reaction, heat given off & temperature of substance rises.

10. Examples Exothermic Combustion of fuels Yeast & Hydrogen Peroxide
Epson salts & water
Endothermic
Photosynthesis
Acetic Acid & Sodium Bicarbonate
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