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Chapter 1: Intro to Chemistry
the study of the composition of matter and the changes that matter undergoes
that which has mass and occupies space
a method of investigation involving observation and theory to test scientific hypotheses
an observation made by using the senses
measurements with numbers and units
what you thought would happen before preforming an experiment
why you thought your prediction would happen
the act of conducting a controlled test or investigation
simply describes what happens(does not explain why); often a mathematical equation
developed after many experiments to explain how or why behaviors happen; often revised over time
manipulated by the scientist; you decide what value you want
measured or observed variable
all variables not being tested in the experiment
standard for comparison; needed to draw a valid conclusion
preforming exactly the same experiment more than once keeping all conditions the same
International System of Units (SI)
Established in 1960, uses base units, derived units and prefixes.