Question | Answer |
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 |