click below

click below

Normal Size Small Size show me how

# Semester 1

What's the relationship between exponents & #s <1? | #s <1 has a + exponent. |

What's the relationship between exponents & #s >1? | #s >1 has a - exponent. |

How can 1.45*12^5 be expanded into the decimal #? | You move the decimal R 5x. 145,000 |

How can .000560 be written in scientific notation? | You move the decimal L 4x. 5.6*10^-4 |

What #s are always significant? | Non0 #s 0s between non0 #s |

What #s are never significant? | 0s at the beginning of a #. |

When are 0s significant? | 0s at the end of a @ are only significant if there's a decimal. |

How do you +/- significant #s? | Answer can have as many decimal places as the least precise # in the problem. |

How to */divide significant #s? | Answer can only have as many sigfigs as the least amount of sigfigs in the problem. |

Bar graphs are used for? | Comparing quick & easy data |

Pie graphs are used for? | Showing percentages |

Line graphs are used for? | Looking at changes over time |

What's accuracy? | Correctness |

What's precision? | Close togetherness |

What's dimensional analysis? | A mathematical way to show a conversion of #s & units. |

What's are the dimensional analysis steps? | Read the problem & circle the units & #s Draw T chart & write given info in upper left Drop units Check given equalities Write opposite equality Move #s to T chart Cancel units * #s at top & divide # @ bottom |

Physical property: | Can be observed without changing the sample's composition |

Extensive physical property: | Depends upon amount of substance present |

Intensive physical property: | Independent of amount of substance present |

Chemical property: | Ability of a substance to combine w/or change into 1+ substances ALWAYS INTENSIVE |

Physical changes: | Doesn't change its composition |

Chemical changes: | Process that involves 1+ substances forming a new substance |

Solid has: | Definite shape Definite volume H density L ke |

Liquid has: | N definite shape Definite volume M density M ke |

Gas has: | N definite shape N definite volume L density H ke |

What's matter? | Anything that has volume & mass |

What's a pure substance? | A substance that can't be broken down into smaller pieces physically. |

What's an element? | Smallest form of matter that has specific properties Found on the periodic table |

What are compounds? | Molecules formed by elements |

What's a mixture? | A mixture that can be broken down physically |

What are solutions? | Solude dissolved into a sovent to make a uniform/homogeneous mixture. |

What are heterogeneous mixtures? | A mixture that's visibly distinguishable. |

Protons | + Located in nucleus |

Neutrons | 0 Located in nucleus Mass #-(+) |

Electrons | - Electron cloud (+)-charge |

Atomic # | # of protons in an atom |

Mass # | (+)+(0) |

Charge of an Atom | (+)-(-) |

Isotopic notation | Mass # Symbol Charge Atomic # |