Smallest particle of an element that still has its properties; made up of protons, neutrons, & electrons

States that the pressure of a gas will change indirectly with a change in volume (same temperature)

States that the volume of a gas will change directly with a change in temperature (same pressure)

Describes how matter reacts or changes, such as flammability

Type of reaction in which matter is changes and creates a new substance

Represents a chemical compound, such as HCl or NaF

Represents a chemical element, such as H or O

Two or more substances that are chemically combined; represented by chemical formulas

Calculated by diving an object's mass by its volume

Simplest pure substance, represented by a chemical symbol

Amount of matter in an object; does not change with changes in gravity

Any substance that has mass and volume;

Two or more substance mixed together but not chemically combined; may be separated by physical means

Describes the appearance and other characteristics of matter

Change in size, shape, or state; does not create a new substance

Mixture in which one substance is dissolved in another, such as lemonade or Kool-Aid

Amount of space an object takes up

Form for matter with varying levels of thermal energy; solids, liquids, and gases

Occurs when a liquid changes into a gas; may be evaporation or boiling

Occurs when a gas turns to a solid or solid turns to a gas without going through the liquid phase

Reaction or change that absorbs energy during the process

Reaction or change that gives off energy during the process

Solid turning into a liquid from a gain of thermal energy

Liquid turning into a solid from a loss of thermal energy

Type of vaporization that occurs throughout a liquid; such as water turning into steam

Type of vaporization that occurs at the surface of a liquid; such as water turning into water vapor at the surface of a puddle

Gas turning into a liquid from a loss of thermal energy; such as water vapor turning into water droplets in a cloud

Phase of matter with a definite shape and volume

Phase of matter with a definite volume, but no definite shape as it takes the shape of its container

Phase of matter that does not have a definite shape or volume as it takes up any available space

Measure of the force of gravity acting on an object; changes with changes in gravity (such as weighing less on the moon)

Fluffy white confection that was used to study Boyle's Law

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Chemistry (7th Grade

Unit 1 Vocabulary

Term	Definition
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

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