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PH Concepts in Action CH 2
Chapter 2 Elements, Compounds & Mixtures
23
Science
9th Grade
09/08/2009

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Term
pure substance
Definition
matter that always has exactly the same composition; an element or compound
Term
atom
Definition
smallest particle of an element
Term
element
Definition
a substance that cannot be broken down into simpler substances
Term
compound
Definition
a substance that is made from two or more simlpler substnace and be broken back down into them
Term
heterogeneous mixture
Definition
parts of the mixture are easlity distinguised from each other (visible)
Term
homogeneous mixture
Definition
parts of the mixture are more uniform and harder to tell apart
Term
solution
Definition
mixture formed when a substance & form a homogeneous mixture
Term
suspension
Definition
heterogeneous mixture that settles into layers over time
Term
colloid
Definition
"mixture containing particles larger than those in solution but smaller than those in suspension, doesn't separate"
Term
physical property
Definition
Any characteristic of a material that can be observed or measured without changed the composition of the substances
Term
viscosity
Definition
"the tendency of a liquid to ""resist"" (not want to) flow"
Term
conductivity
Definition
material's ability to conduct heat
Term
malleabilitiy
Definition
ability for a solid to be hammered without shattering
Term
melting point
Definition
temperature at which a solid becomes a liquid
Term
boiling point
Definition
temperature at which a liquid becomes a gas
Term
filtration
Definition
process that separates a mixture by particle size
Term
distillation
Definition
separting a mixture based on their boiling points
Term
physical change
Definition
when some of the properties change but the substances in the material remain the same-reversob;e
Term
chemical property
Definition
any ability to produce a change in the composition of matter
Term
flammibility
Definition
material's ability to burn in the presence of oxygen
Term
reactivity
Definition
how readily the substance will combine with other substances
Term
chemical change
Definition
When a substance reacts and forms one or more new substances
Term
precipitate
Definition
solid that forms and separates from a liquid
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