Concept Maps

What is matter?

Anything that has mass and occupies space.

What are the two types of matter?

Pure substances and mixtures.

What are pure substances?

Matter with a fixed composition; includes elements and compounds.

What is an element?

A pure substance made of only one type of atom.

What is a compound?

A pure substance made of two or more different atoms chemically bonded.

What is a mixture?

A combination of two or more substances that are not chemically bonded.

What are the two types of mixtures?

Homogeneous (solutions) and heterogeneous mixtures.

What is a homogeneous mixture?

A mixture where substances are evenly distributed (e.g., saltwater).

What is a heterogeneous mixture?

A mixture where substances are unevenly distributed (e.g., salad)

What are physical properties?

Characteristics observed without changing the substance (e.g., color, mass, density).

What are chemical properties?

Characteristics that describe a substance's ability to react (e.g., flammability, reactivity).

What is a physical change?

A change in appearance or state without changing the substance's identity (e.g., melting).

What is a chemical change?

A change where a new substance is formed (e.g., rusting, burning).

What are signs of a chemical change?

Gas formation, color change, temperature change, or precipitate formation.

What is the difference between physical and chemical changes?

Physical changes do not create new substances; chemical changes do.