Exothermic and Endothermic Ms, Nguyen

Thermochemistry

Thermochemistry

Study of heat energy in chemical reactions

Exothermic Process

Process releasing heat energy to surroundings

Endothermic Process

Process absorbing heat energy from surroundings

System

Specific matter studied in an experiment

Surroundings

Everything outside the system in an experiment

Calorie

Unit of heat; raises 1g water by 1°C

Joule

SI unit of energy

Kilocalorie

1000 calories; common unit for food energy

Dietary Calorie

Written with a capital C; 1 kcal = 1000 cal

Law of Conservation of Energy

Energy is neither created nor destroyed in a process

Heat Flow

Measured in calories or joules

Heat Capacity

Amount of heat required to raise temperature by 1°C

Heat Exchange

Transfer of heat between system and surroundings

Heat of Reaction

Heat energy change in a chemical reaction

Heat Transfer

Movement of heat from one substance to another

Heat Release

Energy released from a system to surroundings

Heat Absorption

Energy absorbed by a system from surroundings

Heat Measurement

Quantified using calories or joules

Heat Conversion

Relationship between joules and calories

Energy Conservation

Principle of energy preservation in processes

Heat Calculation

Determining heat changes in reactions

Heat Digestion

Calculating heat from food digestion

Positive Gain

Endothermic

Negative Gain

Exothermic

Melting an ice cube

endothermic

Evaporation of water

Endothermic

Baking bread

Endothermic

Photosynthesis

Endothermic

Burning a candle

Exothermic

Making of a ice cube

Exothermic

What are the three exothermic reactions?

combustion, neutralization, freezing

What are the three endothermic reactions?

sublimation, evaporating, melting