Matter/Energy/Measurement
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17 Terms
chemistry
the study of matter and the changes it undergoes.
matter
anything that occupies space and has mass
substance
a form of matter that has a definite composition and distinct properties
element
substance that cannot be separated into simpler substances by chemical means
how can compounds be separated
compounds can only be separated into their pure components (elements) by chemical means
compound
a substance composed of atoms of two or more elements chemically united in fixed proportions
mixture
a combination of two or more substances that retain their distinct identities.
homogenous
composition of the mixture is the same throughout
hetereogenous
composition is not uniform throughout
how can a mixture be separated?
physical means can separate a mixture into its pure components
physical change
does not alter the composition or identity of a substance.
chemical change
alters the composition and/or identity of the substances involved
mass in terms of volume and density
measure of the quantity of matter
volume
the amount of space an object occupies
density
mass per unit volume
= how many degrees celcius
c + 237
273k = how many degrees celcius
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