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# Chemisty 105 Ch2

### Scientific Notation, Sig Figs, Unit and Teperature Conversions, Density

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

345 in scientific notation is... | 3.45 x 10^2 | 1 kilogram = __ meters | __ kilogram = 1000 meters |

0.0671 in scientific notation is... | 6.71 x 10^-2 | 1 meter = __ centimeters | __ meter = 100 centimeters |

7882 in scientific notation is... | 7.882 x 10^3 | 1 meter = __ millimeters | __ meter = 1000 millimeters |

Volume | Measure of the amount of space occupied by a substance | 1 mL = __ cm^3 | __ mL = 1 cm^3 |

The SI unit of volume is... | cubic meter (m^3) | 1 L = __ dm^3 | __ L = 1 dm^3 |

Mass | Measure of the amount of matter present in a object | The SI unit for mass | kilograms (kg) |

1 kg = ____ lbs | __ kg = 2.20461 lbs | 1 lb = ____ g | _ lb = 453.59g |

A digit that must be estimated is... | Uncertain | A measurement always has... | Some degree of uncertainty |

How many uncertain digits do you report in a measurement? | one. the first uncertain digit | 1 - 9 integers (non zero) _____ count as significant figures | Always |

3456 has how many sig figs? | 4 sig figs (significant figures) | Leading zeros are | zeros that come before nonzero digits |

Leading Zeros ____ count as significant figures | Never | 0.048 has... | 2 sig figs |

Captive zeros | zeros trapped between nonzero digits | Captive Zeros ____ count as significant figures | Always |

16.07 has | 4 sig figs | Trailing zeros | come after nonzero digits |

Trailing zeros are only significant if... | The number contains a decimal point | 9.300 has | 4 sig figs |

150 has | 2 sig figs | Exact numbers (conversion factors) have ____ of significant figures | Infinite number of sig figs |

1 in = ___ cm | _ in = 2.54 cm | 300. is written how in scientific notation and has how many significant figures? | 3.00 x 10^2 and contains 3 sig figs |

Two advantages of Exponential notation is | Number of significant figures are indicated easily and fewer zeros are needed | 5.64 rounds to? | 5.6 |

5.68 rounds to... | 5.7 | 3.861 rounded to three digits is? | 3.86 |

During a calculation, when do you round? | You round at the end, when you are done calculating | In multiplication or division, what determines the number of significant figures in the answer? | The measurement with the smallest number of significant figures |

1.342 x 5.5 = 7.381 how many sig figs would the reported answer be? | 7.4, 2 sig figs | What determines the number of significant figures in the answer of an addition or subtraction problem? | The measurement with the smallest number of decimal places |

23.445 + 7.83 = 31.275 What will the reporting form be (how many decimal places will there be) | 31.28. 4 sig figs | ||

Three systems for measuring temperature are... | Fahrenheit, Celsius, Kelvin | The freezing point of water in Fahrenheit, Celsius, and Kelvin | 32 degrees Fahrenheit, 0 degrees Celsius, and 273 degrees Kelvin |

The boiling points of water in Fahrenheit, Celsius, and Kelvin | 212 degrees Fahrenheit, 100 degrees Celsius, 373 degree Kelvin | Kelvin to Celsius | Tc = Tk - 273 |

Celsius to Fahrenheit | Tf = 1.80(Tc) + 32 | Celsius to Kelvin | Tk = Tc + 273 |

Fahrenheit to Celsius | Tc = (Tf - 32)/1.80 | At what temperature does degrees Celsius = degrees Fahrenheit? | -40 degrees |

Density | Mass of substance per unit volume of the substance | Formula for density | Density = Mass/volume |

Units for Density are... | g/cm^3 (for solids) g/mL (for liquids) | Formula for mass | Mass = Density x Volume |

Formula for volume is | Volume = Mass/ Density | ||

Scientific Notation | Technique used to express very big or very small numbers by expressing a number as a product between 1-9 and a power of 10 | 0.0000496 in scientific notation is... | 4.96 x 10^-5 |

Measurement is | A quantitative observation that consists of a number and a unit | Quantitative observation consists of... | a number and a unit |