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# Chapter 3

### Chapter 3, Scientific Measurement: vocab and key ideas

Question | Answer |
---|---|

What is a measurement? | a quantity that has both a number an a unit. |

What is scientific notation? | when a number is written as the product of two numbers: a coefficient and 10 raised to the power. EX: 602,000,000,000,000,000,000,000 would be 6.02 x 10^23 in scientific notation. |

What is accuracy? | a measure of how close a measurement really came to the true value of whatever was measured. |

What does precision mean? | a measure of how close a series of measurements are to one another, irrespective to the actual value. |

What is the difference between the accepted value ( which is the correct value for the measurement) and the experimental value? (the value measured in the lab) | the error |

What is the percent error of a measurement? | the absolute value of the error divided by the accepted value then multiplied by 100. |

The significant figures in a measurement include what? | all of the digit that are known, plus a last digit that is estimated. |

Why must measurements always be reported to the correct number of significant figures? | because calculated answers often depend on the number of significant figures in the values used in the calculation. |

What is the International System of Units? | a revised version of the metric system. |

What is the abbreviation for the International System of Units? | SI |

In SI the basic unit of length is the __________. | meter |

What is a liter? | the volume of a cube that is 10 centimeters along each edge. |

What is a kilogram? | the basic SI unit of mass. |

What is a gram? | a gram is 1/1000 of a kilogram. |

Define weight: | the force that measures the pull on a given mass by gravity. |

The capacity to do work of produce heat is called what? | energy |

The SI unit of energy is the ______. | joule |

One ____ is the quantity of heat that raises the temperature of 1 g of pure water by one degree celsius. | calorie. |

What is temperature? | the measure of how hot or cold an object is. |

The ______ scale sets the freezing point of water at 0 and the boiling point at 100. | celsius scale. |

What is the freezing point and boiling point on the Kelvin scale? | 273.15 and 373.15. |

What is dimensional analysis? | a way to solve problems using the units, or diminsions, of the measurment. |

What is a conversion measure? | a ratio of equivalent measurements. |

What is density the ratio of? | the mass of an object to its volume. |