Endothermic VS Exothermic Processes

freezing water into ice cubes

exothermic - molecules must lose energy to go from a liquid to a solid

boiling water

endothermic - molecules must gain energy to go from a liquid to a gas

evaporation

endothermic - molecules must gain energy to go from a liquid to a gas

condensation on the outside of a cold drink

exothermic - molecules must lose energy to go from a gas to a liquid

melting chocolate

endothermic - molecules must gain energy to go from a solid to a liquid

baking a cake

endothermic - more energy must be put into the reaction (a cake doesn't bake without the INPUT of thermal energy)

cooking an egg

endothermic - more energy must be put into the reaction in order for the chemical reaction to occur

burning methane gas in a Bunsen burner

exothermic - the activation energy (spark) is less than the energy that is released in the form of thermal and radiant energy

burning a candle

exothermic - the activation energy (match) is less than the energy released in the form of thermal and radiant energy

the light from a glow stick

exothermic - the energy given off is mostly radiant but also a small amount of thermal energy

glow from bioluminescent organisms such as fireflies

exothermic - the energy given off is mostly radiant but also a small amount of thermal energy

photosynthesis

endothermic - plants must take in more energy than they give off

cellular respiration

exothermic - consumers break down food and give off more thermal energy than they take in

lighting a match

exothermic - more thermal energy is released than is needed to start the reaction

activating a cold pack to use on a sore knee

endothermic - thermal energy is absorbed and transformed into chemical energy in the products; the bag feels COLD

baking soda and vinegar reaction

endothermic - thermal energy is absorbed and transformed into chemical energy in the products; the baggie feels cold

air activated hand warmers

exothermic - as a result of the chemical change, thermal energy is released into the surroundings

a chemical reaction that feels cold

endothermic - thermal energy transformed into chemical energy in the products

a chemical reaction that feels warm

exothermic - thermal energy is released into the surroundings with the products in a chemical reaction

dry ice forming "fog" at a Halloween party

endothermic - the frozen carbon dioxide that composes dry ice has to gain energy to go from a solid to a gas (the "fog")