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# Honors Chem Ch 2

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

Hypothesis | A testable statement |

Model | An explanation of how phenomena occur and how data or events are related |

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 |

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

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

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

Density | The ratio of mass to volume or mass divided by volume |

Quantity | Something that has magnitude, size, or amount |

SI | The measurement system accepted worldwide |

Volume | The amount of space occupied by an object |

Weight | A measure of the gravitational pull on matter |

Accuracy | The closeness of measurements to the correct or accepted value of the quantity measured |

Direct Proportion | Two quantities that give a constant value when one is divided by the other |

Inverse Proportion | Two quantities that have a constant mathematical product |

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

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

Scientific Notation | numbers written in the form Mx10^n where the factor M is a number greater than or equal to 1 but less than 10 and n is a whole number |

Significant Figure | Any digit in a measurement that is known with certainty plus one final digit, which is somewhat uncertain or is estimated |

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