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Chapter 2 Vocabulary


pure substance Matter that always has exactly the same composition.
element A substance that cannot be broken down into simpler substances.
atom The smallest particle of an element.
compound A substance that is made up from two or more simpler substances.
heterogeneous mixture Parts of a mixture that are noticeably different from one another.
homogeneous mixture Substances that are so evenly distributed that it is difficult to distinguish one substance in the mixture from another.
solution The mixture that forms in a homogeneous mixture.
suspension A heterogeneous mixture that separates into layers over time.
colloid Contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension.
physical property Any characteristic of a material that can be observed or measured without changing the composition of the substances in the material.
viscosity The tenancy for a liquid to resist flowing.
conductivity A materials ability to allow heat to flow.
malleability The ability for a solid to be hammered without shattering.
melting point The temperature at which a substance changes from a solid to a liquid.
boiling point The temperature at which a substance boils.
filtration A process that separates materials based on the size of their particles.
distillation A process that separates the substances in a solution based on their boiling points.
physical change Occurs when some of the properties in a material change, but the substances in the material remain the same.
chemical property Any ability to produce a change in the composition of matter.
flammability A material's ability to burn in the presence of oxygen.
reactivity The property that describes how readily a substance combines chemically with other substances.
chemical change Occurs when a substance reacts and forms one or more new substances.
precipitate Any solid that forms and separates from a liquid mixture.
Created by: NicholasRatay