Classifying Matter: Physical and Chemical Properties and Changes

What does the law of conservation of matter state?

Matter is not created or destroyed; it only changes form.

What is a substance in terms of matter?

A substance consists of identical particles with a fixed composition.

What is a mixture?

A mixture contains two or more elements that are physically bonded.

What distinguishes a compound from a mixture?

A compound consists of two or more elements that are chemically bonded.

What is a homogeneous mixture?

A mixture with an even distribution of components.

What is a heterogeneous mixture?

A mixture with an uneven distribution of components.

What are physical properties?

Characteristics that can be observed without changing the substance's chemical identity.

What are chemical properties?

Characteristics that describe how a substance reacts and what new substances form.

What is viscosity?

A fluid's resistance to flow.

What is solubility?

A measure of how well a solute dissolves in a solvent.

What is combustibility?

How easily a substance ignites and burns.

What evidence indicates a chemical reaction has occurred?

Changes such as odor, temperature change, light emission, color change, or precipitate formation.

What is the melting point?

The temperature at which a solid becomes a liquid.

What is the boiling point?

The temperature at which a liquid becomes a gas.