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Glossary of Chemistry Vocab Chapter 1

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scientific method
a systematic approach to research
qualitative
consisting of general observations about the system
quantitative
comprising numbers obtained by various measurements of the system
hypothesis
tentative explanation for a set of observations
law
a concise verbal or mathematical statement of a relationship between phenomena thats is always the same under the same conditions
theory
a unifying principle that explains a body of facts and/or those laws that are based on them
matter
anything that occupies space and has mass
chemistry
the study of matter and the changes it undergoes
substance
matter that has a definate or constant composition and distinct properties
mixture
a combination of two or more substances in which the substances retain their distinct identities
homogeneous mixture
the composition of the mixture is the same throughout the solution
heterogeneous mixture
the composition is not uniform
element
a substance that cannot be separated into simpler sbustances by chemical means
compound
a substance composed of two or more elements chemically united in fixed proportions
physical property
can be measured and observed without changing the composition or identity of a substance
chemical property
any property of a substance that cannot be studied without converting the substance into some other substance
extensive property
depends on how much matter is being considered
intensive property
does not depend on the amount of matter being considered
macroscopic properties
can be determined directly
microscopic properties
on the atomic or molecular scale, must be determined bye an indirect method
mass
is a measure of the quantity of mater in an object
weight
is the force that gravity exerts on an object
volume
length (m) cubed
liter
the volume occupied bye one cubic decimeter
accuracy
how close a measurement is to the true value of the quantity that was measured
precision
refers to how closely two or more measurements of the same quantity agree with one another

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