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Exothermic and Endothermic Reactions

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Presentation on theme: "Exothermic and Endothermic Reactions"— Presentation transcript:

1 Exothermic and Endothermic Reactions
Free Science Videos for Kids © Teachable . Some rights reserved.

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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. Free Science Videos for Kids

4 Exothermic and Endothermic Reactions
A reaction in which heat is given out is exothermic. A reaction in which heat is taken in is endothermic. Free Science Videos for Kids Free Science Videos for Kids

5 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 Free Science Videos for Kids © Teachable . Some rights reserved.

6 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) Free Science Videos for Kids

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Measuring Heat reaction Endothermic reaction, heat taken in & temperature of the substance drops Free Science Videos for Kids Free Science Videos for Kids

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

9 Heat Released reaction Exothermic reaction, heat given off & temperature of substance rises. Free Science Videos for Kids

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Examples Exothermic Combustion of fuels Yeast & Hydrogen Peroxide Epson salts & water Endothermic Photosynthesis Acedic Acid & Sodium Bicarbonate Free Science Videos for Kids Free Science Videos for Kids © Teachable . Some rights reserved.

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