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Grade 8 Chapter 2
Chemical Building Blocks Vocabulary
Question | Answer |
---|---|
solid | an object with a definite shape and definite volume |
liquid | no definite shape; definite volume |
gas | no definite shape; no definite volume |
fluid | a substance that flows; a liquid or a gas |
crystalline solid | the particles form a regular, repeating pattern; has a distinct melting point |
amorphous solid | particles are not arranged in a regular patter; no distinct melting point |
temperature | a measure of the average energy of motion of the particles in a substance |
pressure | force divided by area |
kilopascals | unit of pressure |
Boyle's Law | when the pressure of a gas increases, its volume decreases |
graph | diagram that tells how two variables are related |
directly proportional | when two variables pass through the (0,0) point on a graph |
vary inversely | when two variables on a graph form a downward curve close to the vertical axis. |
physical change | alters the form of a substance, but does not change it to another substance |
chemical change | substance is changed into a different substance with different properties |
thermal energy | energy from the movement of particles |
chemical energy | energy from the chemical bonds within matter |
Law of Conservation of Energy | Energy can change from one form to another, but energy can never be lost. |
melting | change in state from a solid to a liquid |
freezing | change of state from liquid to solid |
vaporization | liquid water changing into water vapor |
evaporation | vaporization that takes place on the surface of a liquid |
boiling | vaporization that takes place inside a liquid and at the surface |
condensation | occurs when a gas loses enough thermal energy to become a liquid |
sublimation | occurs when a solid changes into a gas without passing through the liquid state |
chemical reaction | chemical change |
viscosity | the resistance of a liquid to flowing |