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6th grade Ch3 Lessons 4-6

a data set by timmiguez
created October 28, 2016
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FAMILY TREE
TermDefinition
physical changeA change in a substance that does not involve a change in the identity of the substance. Form or appearance can change. boiling- melting are examples.
chemical changeA change that produces one or more new substances. A change in matter that produces a new substance with different properties from the original. Also called a reaction.
law of conservation of massMatter is neither created nor destroyed.
temperatureA measure of the average energy of motion of the particles of a substance.
thermal energyHeat energy
endothermic changeA change in which thermal energy is taken in or absorbed. For example a melting icecube absorbs thermal energy from the surrounding water. boiling -evaporation- baking bread are examples
exothermic changeA change in which thermal energy is released to the surroundings. The area surrounding the object becomes warmer. freezing- condensation are examples
chemical energyenergy stored in chemical bonds
liquidA state of matter in which particles are close together but can move around freely. Has a definite volume but no definite shape
gasA state of matter in which particles have almost no attraction to other particles. No definite shape or volume.
SolidA state of matter in which the particles vibrate but do not change positions. Has a definite shape and a definite volume.
crystalline solidA solid whose atoms are arranged in repeating patterns
amorphous solidA solid made up of particles that are NOT arranged in a regular pattern.
fluidA substance that has the ability to flow.
surface tensionResult of an inward pull of the molecules of a liquid that brings the molecules on the surface closer together.
viscosityA measure of a fluid's thickness or resistance to flow
meltingThe process in which a solid becomes a liquid
melting pointThe temperature at which a solid becomes a liquid
freezingThe process in which a liquid becomes a solid
vaporizationAny change from a liquid to a gas. evaporation and boiling are types.
evaporationA process at which molecules at the surface of a liquid absorb enough energy to change to a gas. Does not need as much heat as boiling
boilingMolecules change from liquid to gas below the surface of the liquid
boiling pointThe temperature at which a liquid changes to a gas
condensationThe change from a gas to a liquid.
sublimationThe change from a solid directly to a gas.
Endoinside
Exooutside
Epion the outside of something
Subbelow
Thermheat
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