Exothermic vs Endothermic

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Presentation transcript:

Exothermic vs Endothermic

Endothermic Reactions Endothermic reactions absorb energy from their surroundings. If a substance is undergoing an endothermic reaction would it’s surroundings get warmer or colder? __________ Endothermic reactions occur when the bonds of a substance are broken.

Useful Endothermic Reactions Cooking is an endothermic reaction. The food takes in heat provided by the oven/stove. The chemicals of the food undergo a chemical reaction making them easier to digest. Cold packs for sports injuries rely on endothermic reactions. When you twist or shake the pack the chemicals in the pack start reacting. When they undergo an endothermic reaction they take heat in from their surroundings. This makes the pack cold.

Exothermic Reactions Exothermic reactions give off heat. They occur when chemical bonds are formed.

Useful Exothermic Reactions Combustion: all combustion reactions give off heat. Neutralization (acid reacting with a base) reactions are exothermic. Hand warmers When the hand warmer is shaken, chemicals inside undergo an exothermic reaction This releases the heat which helps to warm up your hand.

Chemistry Homework Page 45, 1-13

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