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Matter & Energy

Vocabulary

TermDefinition
Mass The amount of matter in an object
Weight The force of gravity pulling mass towards the center of the earth
Chemical Change When substance combines to form a new substance and it can’t be undone. Examples: Baking a cake, rust, burning things.
Physical Change When substances combine to form a new substance but are still the same materials. Examples: Mixtures, changing colors, cutting your hair.
Law of Conservation of Mass Mass can’t be created or destroyed.
Reactants objects that start off the reaction
Products what results after the reaction
Physical Properties properties that you can describe using your 5 senses.
Chemical Properties the chemical makeup of a substance.
Thermal Energy Heat energy
Conduction the transfer of heat through a material by direct contact
Convection the transfer of heat in a gas or liquid, warmer material rises and cooler falls causing a cycle.
Radiation the transfer of heat through electromagnetic waves.
Heat Transfer the transfer of thermal energy between substances due to a difference in their temperatures.
Conductors Materials that easily conduct heat, like metal.
Insulators Materials that do not easily conduct heat, like plastic and wood.
Created by: ndwilli6