Chapter 1 Essential Ideas: 1.2 Phases and Classification of Matter

Vocabulary flashcards covering key terms from the notes on phases and classification of matter, atoms and molecules, and mass/weight concepts.

Matter

Anything occupying space and having mass.

Solid

A phase of matter with definite shape and definite volume.

Liquid

A phase of matter with definite volume but no definite shape.

Gas

A phase of matter with no definite shape and no definite volume.

Phase

A distinct form of matter (solid, liquid, or gas) with characteristic properties.

Homogeneous mixture

A mixture with a uniform composition throughout; components are not visually distinguishable.

Heterogeneous mixture

A mixture with non-uniform composition; components are visually distinguishable.

Mixture

A combination of two or more substances not bonded chemically; can be separated by physical means.

Atom

The smallest unit of an element; cannot be split via chemical means.

Molecule

Two or more atoms bonded together; can be the same or different elements.

Element

A pure substance that cannot be decomposed into simpler substances by chemical means; composed of one kind of atom.

Compound

A substance formed when two or more elements are chemically bonded; can be broken down into its elements by chemical reactions.

Ethanol

CH3CH2OH; a common organic solvent and compound.

Mass

A measure of the amount of matter in an object; mass remains constant during a chemical change.

Weight

A measure of gravitational force on a mass; depends on location (Earth vs Moon).

Law of Conservation of Mass

Mass is conserved in chemical reactions; matter is not created or destroyed.

Conservation of Matter

The total amount of matter in a closed system remains the same.