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# chem303.s1.d10

### cava chem 303 1.12 Problem Solving in Chemistry

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

Sometimes measurements involve very [...] or very [...] numbers, which the chemist must represent in some convenient shorthand. | Sometimes measurements involve very large or very small numbers, which the chemist must represent in some convenient shorthand. |

A chemist's measurements WILL have some degree of [...], depending on the precision of his instruments. | A chemist's measurements WILL have some degree of uncertainty, depending on the precision of his instruments. |

Mercury is an unusual substance. It is a metal, but is liquid at [...] temperature. | Mercury is an unusual substance. It is a metal, but is liquid at room temperature. |

All sciences, including chemistry, use the Système International d'Unités ([...], or International System of Units), which has the metric system as its basis. | All sciences, including chemistry, use the Système International d'Unités (SI, or International System of Units), which has the metric system as its basis. |

To convert from one unit to another, you take what you have and multiply it by a [...] factor. | To convert from one unit to another, you take what you have and multiply it by a conversion factor. |

A conversion factor is a fraction where the top and bottom are [...] to each other, but have different [...] (e.g. 12inches / 1foot) | A conversion factor is a fraction where the top and bottom are equal to each other, but have different units (e.g. 12inches / 1foot) |

Conversion factors can be written in [...] form (12 inches = 1 foot) or [...] form ( 12 inches / 1 foot; 12 inches PER foot). | Conversion factors can be written in equation form (12 inches = 1 foot) or fraction form ( 12 inches / 1 foot; 12 inches PER foot). |

It doesn’t matter whether a conversion factor is in equation form or fraction form; the two sides are [...], but with different [...]. This is the key to converting one unit to another. | It doesn’t matter whether a conversion factor is in equation form or fraction form; the two sides are equal, but with different units. This is the key to converting one unit to another. |

Large and small numbers can be represented by [...] notation; it makes them easier to work with. | Large and small numbers can be represented by scientific notation; it makes them easier to work with. |

Scientific notation re-writes all numbers as a single number (the coefficient) multiplied by [...] raised to some power. | Scientific notation re-writes all numbers as a single number (the coefficient) multiplied by 10 raised to some power. |

In scientific notation, the coefficient is always starts with a non-[...] digit, and the decimal always comes after the [...] digit. | In scientific notation, the coefficient is always starts with a non-zero digit, and the decimal always comes after the first digit. |

6.25 * 10^8 :: move the decimal to the [...] eight places | 6.25 * 10^8 :: move the decimal to the right eight places |

6.25 * 10^(-8) :: move the decimal to the [...] eight places | 6.25 * 10^(-8) :: move the decimal to the left eight places |

All measurements are inexact. The level of uncertainty depends on how precise the [...] is that is used to make the measurement. | All measurements are inexact. The level of uncertainty depends on how precise the device is that is used to make the measurement. |

To express the uncertainties but report the most information about your measurements, you will use what are called [...] figures . | To express the uncertainties but report the most information about your measurements, you will use what are called significant figures . |

The number of significant figures (sometimes called significant digits) represents the degree of [...] in any measurement. | The number of significant figures (sometimes called significant digits) represents the degree of precision in any measurement. |

When making a measurement or calculation involving significant figures, the answer can have no more significant figures than the [...] number in any of the quantities used in the calculation. | When making a measurement or calculation involving significant figures, the answer can have no more significant figures than the least number in any of the quantities used in the calculation. |

Created by:
mr.shapard