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28 Cards in this Set

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  • Back
experiment
an observation of natural phenomena carried out in a controlled manner so that the results can be duplicated and rational conclusions obtained
law
concise statement of mathematical equation about a fundamental relationship or regularity of nature
hypothesis
tentative explanation of some regularity of nature
theory
tested explanation of basic natural phenomena
mass
quantity of matter in a material
matter
whatever occupies space and can be perceived by our senses
law of conservation of mass
total mass remains constant during a chemical change (chemical reaction)
physical change
a change in the form of matter but not in its chemical identity
chemical change (chemical reaction)
change in which one of more kinds of matter are transformed into a new kind of matter or several new kinds of matter
physical property
characteristic that can be observed for a material without changing ints chemical identity (ex. melting point and color)
chemical property
characteristic of a material involving its chemical change (chemical property of iron is its ability to react with oxygen to produce rust)
substance
kind f matter that cannot be separated into other kinds of matter by any physical process
element
a substance that cannot be decomposed by any chemical reaction into similar substances
compound
substance composed of two or more elements chemically combined
compound
substance composed of two or more elements chemically combined
law of definite proportions (law of constant composition)
a pure compound, whatever its source, always contains definite or constant proportions of the elements by mass
mixture
material that can be separated by physical means into two or more substances
heterogeneous mixture
mixture that consists of physically distinct parts each with different properties
homogeneous mixture (solution)
mixture that is uniform in its properties throughout given samples
phase
one of several different homogeneous materials present in the portion of matter under study
precision
closeness of the set of values obtained from identical measurememts of a quantity
accuracy
closeness of a single measurement to its true value
exact number
number that arises when you count items or sometimes when you define a unit (12 inches in a foot)
kilogram (kg)
2.2 pounds
Celsius (c)
C= 1.8 * (F-32)
Kelvin
K= C +273
Density
D=m/v
dimensional analysis (factor-label method)
method of calculation in which one carries along the units for quantities