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the study of the composition of matter and the changes that matter undergoes


that which has mass and occupies space

scientific method

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

independent variable

manipulated by the scientist; you decide what value you want

dependent variable

measured or observed variable


all variables not being tested in the experiment

experimental control

standard for comparison; needed to draw a valid conclusion

multiple trials

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.

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