ENDOTHERMIC OR EXOTHERMIC PRACTICE

Classify the following processes as endothermic (absorbs heat) or exothermic (releases heat):

Endothermic (Heat is absorbed to change from solid to liquid)

Melting of Rubber

Endothermic (Alcohol evaporates, absorbing heat from the skin)

Rubbing the hands with alcohol

Exothermic (Combustion releases heat energy)

Burning of Gasoline

Exothermic (Heat is released as HCl dissolves and ionizes in water)

Mixing of HCl with Water

Endothermic (Heat is absorbed to change from solid to gas)

Subliming Naphthalene

Endothermic (Sweat evaporates, absorbing heat from the body)

Perspiring

Exothermic (Heat is released as water freezes)

Making of Ice

Exothermic (Heat is released when water vapor condenses and freezes)

Ice or Snow Forming in the Clouds

Endothermic (Gas expands, requiring energy)

Inflating a Bicycle Tire

Exothermic (Digestion releases energy in the form of ATP)

Breaking Down of Food

Endothermic (Heat is absorbed to turn liquid into gas)

Boiling water

Exothermic (Gas releases heat to become liquid)

Condensation of steam on a mirror

Endothermic (Heat is absorbed to cook the egg)

Cooking an egg

Exothermic (Heat is released as water turns to ice)

Freezing of water

Endothermic (Plants absorb sunlight for energy)

Photosynthesis

Exothermic (Burning wax releases heat and light)

Lighting a candle

Endothermic (Heat is absorbed to break ionic bonds)

Dissolving salt in water

Exothermic (Releases energy in cells)

Respiration (breaking down glucose for energy)

exothermic (Water vapor releases heat as it turns to liquid)

Condensation of dew on grass

Endothermic (Oven heat is absorbed for the baking process)

Baking bread