Exothermic and Endothermic Reactions

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Exothermic and Endothermic Reactions

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Exothermic and Endothermic Reactions Endothermic & Exothermic Reactions, Fremont 2013 Exothermic and Endothermic Reactions © Teachable . Some rights reserved. http://teachable.net/res.asp?r=1910

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)

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

Ammonium nitrate + water

Starting temperature 20⁰ C

Add ammonium nitrate to water

a temperature decrease of 8⁰ C

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

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

Examples Exothermic Combustion of fuels Yeast & Hydrogen Peroxide Epson salts & water Endothermic Photosynthesis Acetic Acid & Sodium Bicarbonate © Teachable . Some rights reserved. http://teachable.net/res.asp?r=1910