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7th grade Science
Chapter 2 -- Changes of State
Term | Definition |
---|---|
HEAT | Energy that is transferred from a substance at a higher temperature to a substance at a lower temperature. |
TEMPERATURE | A measure of the average kinetic energy of the atoms or molecules of a substance |
CONDUCTION | The transfer of energy between materials by the collisions of particles |
ENERGY | Property of objects which can be transferred to other objects or converted into different forms, but cannot be created or destroyed. |
EVAPORATION | When a substance changes from a liquid to a gas; molecules going into the air |
MOLECULE | Smallest unit of a substance that has all the properties of that substance |
ATOMS | The smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule |
CONDENSATION | When a substance changes from a gas to a liquid |
FREEZING POINT | The temperature when a liquid is cooled and changes to a solid. |
MELTING POINT | The temperature when a solid is heated and is changing to a liquid. |
KINETIC ENERGY | The energy of a moving object |
SUBLIMINATION | When a substance changes directly from a sold to a gas. |
DEPOSITION | When a substance changes from a gas to a solid |
RULE OF CONDUCTION | Energy can only be transferred from something at a higher temperature to something with a lower temperature. |