AP Chem Chapter 1 Vocab
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16 Terms
qualitative
consisting of general observations about the system
quantitative
comprising of numbers obtained by various measurements of the system
matter
anything that occupies space and has mass
substance
a form of matter that has a definite composition and distinct properties (water, gold, sugar, oxygen)
mixture
a combination of two or more substances in which the substances retain their distinct identities (air, soda, milk, cement)
homogenous mixture
the composition of the mixture is the same (uniform) throughout (dissolving sugar in water)
heterogeneous mixture
the composition is not uniform (salt and pepper)
element
a substance that cannot be separated into simpler substances by chemical means
compound
a substance composed of atoms of two or more elements chemically united in fixed properties
physical property
can be measured and observed without changing the composition or identity of a substance (melting point, density)
chemical property
in order to observe this property we must carry out a chemical change
Kelvin
the SI (System Internationale d’Unites) base unit of temperature
Absolute zero
0 K or -273.15 degrees C, theoretical lowest temperature
accuracy
how closely two or more measurements of the same quantity agree with one another
significant figures (sig figs)
the meaningful digits in a measured or calculated quantity
precision
how closely two or more measurements of the same quantity agree with one another