Exo and endothermic reactions
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Exo- and Endothermic Reactions. Science 9. Energy Changes in Reactions. Every chemical reaction either uses energy or produces energy in the form of heat. Exothermic Reactions. Reactions that produce energy in the form of heat or light “exo” means outside and “therm” means heat

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Exo- and Endothermic Reactions

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Exo and endothermic reactions

Exo- and Endothermic Reactions

Science 9


Energy changes in reactions

Energy Changes in Reactions

  • Every chemical reaction either uses energy or produces energy in the form of heat


Exothermic reactions

Exothermic Reactions

  • Reactions that produce energy in the form of heat or light

  • “exo” means outside and “therm” means heat

  • The energy term written as a product

  • 2C2H2 + 5O2 4CO2 + 2H2O + energy


Exothermic reactions1

Exothermic reactions

  • Exothermic Reaction: a chemical reaction that releases energy into its surroundings

  • Often, chemical bond energy (when bonds are broken) is converted into heat energy

  • Reaction warms up its surroundings

  • Exothermic reactions can be extremely dangerous!!


Examples

Examples:


Exothermic reaction

Exothermic reaction

  • Also includes changes of state

  • From Gasliquidsolid


Endothermic reactions

Endothermic Reactions

  • Reactions that use heat energy

  • “endo” means inside and “therm” means heat

  • The energy term is written as a reactant

  • NH4NO3 + energy NH4+ + NO3-


Endothermic reactions1

Endothermic reactions

  • Endothermic reaction: a chemical reaction that absorbs energy from its surroundings

  • Chemical endothermic reactions need heat to be performed

  • Reaction cools down the surroundings (draws in heat, so feels cool)


Endothermic reactions2

Endothermic reactions

  • Examples:

  • Cooking food

  • Melting of ice

  • Photosynthesis

  • Changes of state:

  • From Solidliquidgas


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