KS3 Endothermic and Exothermic reactions chemestry

In an exothermic reaction, the temperature of the surroundings will...

increase

In an endothermic reaction, the temperature of the surroundings will...

decrease

A reaction in which the reactants have more energy than the products

exothermic

A reaction in which the products have more energy than the reactants

endothermic

freezing water into ice cubes

exothermic - HEAT LEAVES THE WATER TO FORM ICE

boiling water

endothermic - HEAT ENTERS THE WATER TO MAKE IT BOIL

evaporation

endothermic - HEAT ENTERS THE WATER TO TURN IT INTO STEAM

baking a cake

endothermic - HEAT ENTERS, CAKE MUST BECOME WARM TO BAKE. (when the cake is in the over the oven must keep putting more heat in to cook the cake).

cooking an egg

endothermic - HEAT ENTERS, EGG MUST BECOME WARM TO COOK.

photosynthesis

endothermic - HEAT FROM THE SUN IS GOING INTO THE PLANT

HEAT LEAVES THE SYSTEM, HEAT IS A PRODUCT

Exothermic

HEAT GOES INTO THE SYSTEM, HEAT IS A REACTANT

Endothermic

air activated hand warmers

exothermic

lighting a match

exothermic

campfire

exothermic

A reaction that converts chemical energy to thermal energy (heat is given out)

Exothermic reaction

A reaction that converts thermal energy to chemical energy (heat is taken in)

Endothermic reaction

Examples of exothermic changes

Combustion, neutralisation, displacement, condensation