The study of change Flashcard

scientific method
is a systematic approach to research
hypothesis
is a explanetion fo a set of observations
law
is a concise statement of a relationship between phenomena that is the same under the same conditions
theory
is a principle that explains a body of facts and/or those laws that are based on them
matter
is anything that occupies space and has mass
substance
is a form of matter that has a difinite composition and distinct properies
mixture

is a combination of two or more

 substances in which the substances

retain their

distinct identities

 

 

homogenous

 

 

heterogenous

 

composition of the mixture is the same throughout

 

 

composition is not uniform throughout

element
is a substance that cannot be separated into simpler substances by chemical means
compound

is a substance composed of atoms of two or more elements chemically united in fixed proportions

 

Compounds can only be separated into their pure components (elements) by chemical means

physical change
does not alter the composition or identity of a substance
chemical change
alter the compdsition or identity of the substance(s) involved
extensive property
depends upon how much matter is is being considered

mass length volume

intesive property
does not depend upon how much matter is is being considered

density temperature color

 

accuracy

 

precision

 

how close a measurement is to the true value

 

how closea set of measurements are to each other

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