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# Chemistry Chapter 4

Term | Definition |
---|---|

Hypothesis | a testable statement |

Theory | a broad generalization that explains a body of facts or phenomena |

Derived Unit | combinations of SI base units |

Density | the ratio of mass to volume, or mass divided by volume |

Accuracy | refers to the closeness of measurements to the correct or accepted value of the quantity measure |

Direct Proportion | two quantities are directly proportional to each other is dividing one by the other gives a constant value |

Precision | refers to the closeness of a set of measurements of the same quantity made in the same way |

Scientific Method | a logical approach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses and formulating theories that are supported by data |

Model | a model in science is more than a physical object; it is often an explanation of how phenomena occur and how data or events are related |

SI | A single measurement system called Le Système International d'Unités |

Quantity | something that has magnitude, size or amount |

Inverse Proportion | two quantities are inversely proportional if their product is constant |

Percent Error | calculated by subtracting the experimental value from the accepted value, dividing the difference by the accepted value, and then multiplying by 100 |

System | a specific portion of matter in a given region of space that has been selected for study during an experiment or observation |

Conversion Factor | a ratio derived the equality between two different units that can be used to convert from one unit to the other |

Weight | a measure of the gravitational pull on matter |

Volume | the amount of space occupied by an object |

Significant Figures | consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated |

Scientific Notation | numbers written in the form M x 10^n, where the factor M is a number greater than or equal to 1 but less than 10 and n is a whole number . |

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