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Science Ch.2
Chapter two vocabulary
Term | Definition |
---|---|
Chemical Change | a change that occurs when one or more substances change into entirely new substances with different properties. |
Molecule | the smallest unit of a substance that still behaves like the substance |
Density | the ratio of mass to volume in a substance. |
Atom | the smallest unit of an element that keeps the elements chemical properties. |
Boiling Point | the temperature at which a liquid changes to a gas. |
Melting Point | the temperature at which a substance changes from a solid to a liquid. |
Mixture | a combination of substances that are not chemically combined. |
Pure Substance | matter that has a fixed composition and definite properties. |
Compound | a substance made up of atoms of different elements. |
Element | a substance that cannot be broken down into smaller substances by chemical means . |
Physical Change | a change of matter from one form to another without a change in chemical properties. |
Matter | anything that has mass and takes up space. |