Exothermic vs Endothermic Endothermic Reactions Endothermic reactions absorb
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
• Endothermic and Exothermic Reactions Lesson Power. Point – You. Tube • Exothermic and Endothermic Reactions - Video for kids – You. Tube • Endothermic and Exothermic Reactions – You. Tube • Phase Changes: Exothermic or Endothermic? – You. Tube • Chemistry Music Video 21: Exo, Endo, What's The Diff – You. Tube • Endothermic Exothermic - You. Tube
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