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Chemistry (7th Grade

Unit 1 Vocabulary

TermDefinition
Atom Smallest particle of an element that still has its properties; made up of protons, neutrons, & electrons
Boyle's Law States that the pressure of a gas will change indirectly with a change in volume (same temperature)
Charles' Law States that the volume of a gas will change directly with a change in temperature (same pressure)
Chemical property Describes how matter reacts or changes, such as flammability
Chemical change Type of reaction in which matter is changes and creates a new substance
Chemical formula Represents a chemical compound, such as HCl or NaF
Chemical symbol Represents a chemical element, such as H or O
Compound Two or more substances that are chemically combined; represented by chemical formulas
Density Calculated by diving an object's mass by its volume
Element Simplest pure substance, represented by a chemical symbol
Mass Amount of matter in an object; does not change with changes in gravity
Matter Any substance that has mass and volume;
Mixture Two or more substance mixed together but not chemically combined; may be separated by physical means
Physical property Describes the appearance and other characteristics of matter
Physical change Change in size, shape, or state; does not create a new substance
Solution Mixture in which one substance is dissolved in another, such as lemonade or Kool-Aid
Volume Amount of space an object takes up
Phase (State) Form for matter with varying levels of thermal energy; solids, liquids, and gases
Vaporization Occurs when a liquid changes into a gas; may be evaporation or boiling
Sublimation Occurs when a gas turns to a solid or solid turns to a gas without going through the liquid phase
Endothermic Reaction or change that absorbs energy during the process
Exothermic Reaction or change that gives off energy during the process
Melting Solid turning into a liquid from a gain of thermal energy
Freezing Liquid turning into a solid from a loss of thermal energy
Boiling Type of vaporization that occurs throughout a liquid; such as water turning into steam
Evaporation Type of vaporization that occurs at the surface of a liquid; such as water turning into water vapor at the surface of a puddle
Condensation Gas turning into a liquid from a loss of thermal energy; such as water vapor turning into water droplets in a cloud
Solid Phase of matter with a definite shape and volume
Liquid Phase of matter with a definite volume, but no definite shape as it takes the shape of its container
Gas Phase of matter that does not have a definite shape or volume as it takes up any available space
Weight Measure of the force of gravity acting on an object; changes with changes in gravity (such as weighing less on the moon)
Marshmallow Fluffy white confection that was used to study Boyle's Law
Created by: ttomm