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Phys Sci - ChemIntro

9th Grade Physical Science (Chemistry) Introductory Unit

QuestionAnswer
atom basic particle from which all elements are made
boiling point temperature at which a substance changes from a liquid to a gas
boiling phase change that occurs when a liquid turns to a gas
chemical property characteristic of a pure substance that describes its ability to change into a different substance
chemistry study of the properties of matter and how matter changes
density the ratio of the mass of a substance to its volume
element pure substance that cannot be broken down into other substances by chemical or physical means, one of the 115ish basic materials that make up all matter
compound a pure substance made of two or more elements chemically combined
evaporation phase change that occurs as the surface of a liquid converts to a gas
gas state of matter with no definite shape or volume
hypothesis educated guess; a possible explanation for a set of observations or answer to a scientific question
International System of Units system of units (SI) used by scientists to measure the properties of matter
liquid state of matter that has no definite shape but has a definite volume
mass measure of how much matter is in an object
matter anything that has mass and occupies space
melting phase change from the solid to the liquid state
neutron small particle (subatomic) in the nucleus of the atom, has no electrical charge
physical change a change in a substance that does not change its identity
physical property characteristic of a pure substance that can be observed without changing into another substance
proton positively charged subatomic particle that is part of an atom's nucleus
theory well-tested explanation for a wide range of observations or experimental results
solid state of matter that has a definite shape and volume
state one of the three forms (solid, liquid, gas) in which matter exists
surface tension result of inward pull among the molecules of a liquid that brings the molecules on the surface closer together
vaporization the change of state from a liquid to a gas
volume amount of space that matter occupies
weight a measure of the force of gravity on an object
Created by: krs83301
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