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Chemistry Test 1
Question | Answer |
---|---|
Scientific Method | 1)Make Observations 2)Form a Hypothesis 3)Perform a controlled experiment 4)Analyze data 5)Form a theory |
Hypothesis | reasonable explanation for a series of events |
Control | factor that stays the same |
Variable | factor that changes |
Independent Variable | factor that you are testing |
Dependent Variable | factor you measure/data |
Theory | reasonable explanation for a series of events that have been tested |
Base units | a unit of measure that is based on an object in the physical world |
SI units | International system of Units |
The base units | -mass-kilogram kg -length-meter m -electric current-ampere A -amount of substance-mole mol -luminous intensity-candela cd -time-seconds s -temperature- kelvin K |
Derived Units | Units of measurement composed of two or more base units |
3 Base Units | volume: meters cubed cm^3 density: mass per volume g/cm^3 speed: meters per second m/s |
Weight vs. Mass | Mass is a constant measurement in grams and weight varies based on gravitational pull measured in Newtons |
Precision vs. Accuracy | how close measurements are to a true value while precision is how close measurements are to each other |
kilo | 1000 |
milli | 1/1000 |
centi | 1/100 |
MAXCOM | system used for storing and labeling chemicals green-low yellow-moderate red-high hazard 1-36 |
MSDS | Material Safety Data Sheet |