1 / 11

Jump Jump

Criss-cross notes. Jump Jump. Criss-Cross Method. Criss-cross is a _________ to help you find chemical __________ when you _________ atoms. shortcut. formulas. combine. **Formulas contain both the ________ in a compound and the _______ of that element. elements. amount. How Many?.

huyen
Download Presentation

Jump Jump

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Criss-cross notes Jump Jump

  2. Criss-Cross Method Criss-cross is a _________ to help you find chemical __________ when you _________ atoms. shortcut formulas combine **Formulas contain both the ________ in a compound and the _______ of that element. elements amount

  3. How Many? 1 sodium NaCl = 1 chlorine 1 magnesium MgCl2 = 2 chlorines This number is called a ________ subscript It tells you the _______ of the atom ________ in front of it! amount directly

  4. To get started… First – you need to determine the _________ number for each atom. oxidation You can find them in the ______- ______ corner on the Periodic Table. upper right

  5. Cl Oxidation Oxidation numbers are the _____ that will form when atoms _________ their _________ shells. ions complete valence Oxidation number Cl-1

  6. More than one? Many atoms have more than one oxidation state! We will use the ______ one listed! first (This is the one most _________ formed in nature!) commonly

  7. Criss-Cross will make you... Find the correct formula for a compound!! • Use the oxidation #’s • Put the _______ one first positive H+1 + O-2  H2O

  8. What just happened? By switching the numbers, the _________ number of one atom becomes the _________ for the other! oxidation subscript This also makes sure that we end up with a _______ compound – all the ________ of the ions add up to ______. neutral charges zero

  9. Stuff to remember… ‘Ones’ are ________. (Think Math!) invisible If both of your ions have the _____ oxidation number -- ______ to the ______ common number! same reduce lowest It will make more sense after examples…

  10. Criss-Cross practice +2 -1  CaBr2 Ca + Br +2 -1 Mg+ Cl  MgCl2 +2 -2 Sr2O2  SrO Sr + O

  11. What's my name? Don’t forget the rules for naming: 1. ______ always goes first! Metal 2. ________ goes second – and ends in _____! Nonmetal “-ide” Have fun!!!

More Related