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6th Grade Science

Matter

Anything that has mass and takes up space.

Chemistry

The study of matter and how matter changes.

Physical Property

A characteristic of a substance that can be observed without changing the substance into another substance.

Chemical Property

A characteristic of a substance that describes its ability to change into different substances.

Physical Change

A change that alters the form or appearance of a material but does not make the material into another substance.

Chemical Reaction

The process in which substances undergo chemical changes that result in the formation of new substances.

Precipitate

A solid that forms from a solution during a chemical reaction.

Weight

A measure of the force of gravity on an object.

Mass

The measure of how much matter is in an object.

International System of Units

The system of units (SI) used by scientists to measure the properties of matter.

Volume

The amount of space that matter occupies.

Density

The measurement of how much mass of a substance is contained in a given volume.

Amorphous Solid

A solid made up of particles that are not arranged in a regular pattern.

Crystalline Solid

A solid that is made up of crystals in which particles are arranged in a regular, repeating order.

Solid

A state of matter that has a definite shape and a definite volume.

Liquid

A state of matter that has no definite shape but has a definite volume.

Gas

A state of matter with no definite shape or volume.

Fluid

Any substance that can flow.

Viscosity

A liquid's resistance to flowing.

Surface Tension

The result of an inward pull among the molecules of a liquid that brings the molecules on the surface closer together.

Melting

The change of state from solid to liquid.

Melting Point

The temperature at which a substance changes from a solid to a liquid (The same as the freezing point).

Freezing

The change of state from liquid to solid.

Condensation

The change of state from a gas to a liquid.

Vaporization

The change of state from a liquid to a gas.

Evaporation

The process that occurs when vaporization takes place only on the surface of a liquid.

Boiling

The process that occurs when vaporization takes place inside a liquid as well as on the surface.

Boiling Point

The temperature at which a substance changes from a liquid to a gas (The same as the condensation point).

Sublimation

The change is state from a solid directly to a gas without passing through the liquid state.

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