Unit 1: Mathematics
Sig Figs, Metric Prefixes, Sci. Notation, Scientific Method
|How are measurements accurate? ||Measurements are accurate by being close to the actual/real result or measurement.|
|How are measurements precise ||Measurements are precise by being close to one another. You can be precise but not accurate.|
|Describe a hypothesis ||A hypothesis is an if, then STATEMENT that describes what you believe will happen in an experiment.|
|What is qualitative data? ||Qualitative data is a description of results using words.|
|What is quantitative data? ||Quantitative data is a description of results using numbers.|
|How do scientific theories and hypotheses differ? ||Theories are as close to scientific law as possible. They have been tested repeatedly over many many years and proven to be correct.
Hypotheses are for a particular experiment but can become theories after a long period of time.|
|What are metric prefixes? Give an example. ||Metric prefixes are attached to SI units to express the value of the unit.
Ex. km = Kilo meters. Kilo stands for 1000 so 1km = 1,000 meters|
|What is scientific notation? Give an example. ||Scientific notation expresses values by their significant figures x10^n
If n is a negative exponent the value is a decimal
If n is a positive exponent the value is a number greater than 1.
Ex. 4.5x10^2 = 450|
|What are Significant Figures? Give an example. ||Significant figures are all the relevant numbers expressed in a measurement. *Check your fact sheet!
Ex. 65000 = 2 sig figs|
|What is an independent variable? ||The variable that you are testing. This is the one variable that you change per experiment.|
|What is a dependent variable? ||The variable that you are collecting. This is the measured variable.|
|What is a control variable? ||The variable that you are keeping constant through out the experiment.
*NOT TO BE CONFUSED WITH CONTROL GROUP! A CONTROL GROUP IS A GROUP THAT IS KEPT CONSTANT AS A REFERENCE!|
|What are SI Units? What units do we commonly use in here? ||SI Units = International Systems of Units.
Length = meter, m
Mass = kilogram, kg
Time = seconds, s
Temperature = Kelvins, K
Electric Current = Ampere, A|