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# Unit 1: Mathematics

### Sig Figs, Metric Prefixes, Sci. Notation, Scientific Method

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 |

Created by:
becook87
on 2014-05-23