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Matter & Energy
Vocabulary
Term | Definition |
---|---|
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. |