Physical Science Ch. 2 Test

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and aluminum.

A compound is a substance formed when two or more elements chemically bond together. Water (H2O) is an example of a compound.

A mixture is a combination of two or more substances that are not chemically bonded. Tap water is an example of a mixture.

A chemical change is a process that involves the transformation of one or more substances into different substances. Evidence of a chemical change includes the formation of a precipitate or gas.

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting ice or cutting paper.

Malleable refers to a material's ability to be hammered or pressed into shape without breaking. Metals like gold and aluminum are malleable.

Viscous describes a thick, sticky consistency of a liquid that resists flow. Honey is an example of a viscous substance.

Flammable refers to a substance's ability to catch fire easily. Materials like gasoline and paper are flammable.

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

A substance has a uniform and definite composition, while a mixture contains two or more substances that retain their individual properties.