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# chemistry ch. 1 & 2

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

What is dimensional analysis? | conversion of a quantity in one unit to a quantity in another |

How many atoms are in exactly 1 mol of an element? | 6.022 * 10^23 atoms |

Are non zero digits significant or not? | significant |

Are zeros between digits significant or not? | significant |

Are zeros at the beginning of a number significant or not? | not significant |

When are zeros at the end of a number significant? | when there is a decimal point |

How many significant figures are in multiplication and division? | factor with least amount of significant figures will determine |

How many significant figures are in addition and subtraction? | least significant decimal place |

The formula for density is: | mass/volume |

Are columns or rows considered groups in the periodic table? | Columns |

Where are metals? | left side |

Where are nonmetals? | right side |

Where are metalloids? | zig zag |

Where are electrons found? | traveling around the nucleus |

Where are protons and neutrons found? | in the nucleus |

What has to be the same and what could be different? | protons and electrons must be the same neutrons can be different |

T or F? Isotopes have the same number of protons, electrons, and neutrons | F. isotopes do not have the same number of neutrons |

How many atoms are in a decimal of a mol? | decimal * 6.022 10^23 |

How many moles are in a sample containing __ atoms of an element ? | divide sample and 6.022 10^23 subtract notations |

Mass of a certain mol? | mass x elements mass |

Molar mass? | g/mol |

How do you find an atom of a mole? | elements mass / 6.022 10^23 |

Mass of 1 mol of an element? | Elements atomic mass |

How do you identify the element with the mass and number of atoms? | atoms / 6.022 10^23 / mol |

Mol of a certain mass? | provided mass / elements mass |

What is the mass of __ atoms? | atoms / 6.022 10^23 *elements mass |