Mizzou CHEM 1100 - Chemical Equations (3 pages)

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Chemical Equations



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Chemical Equations

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Learning how to balance equations and an in depth discussion about ozone.


Lecture number:
3
Pages:
3
Type:
Lecture Note
School:
University of Missouri
Course:
Chem 1100 - Atoms and Molecules With Lab
Edition:
1

Unformatted text preview:

Chem 1100 Lecture 3 Outline of Last Lecture I Elements Continued II The Periodic Table III Atoms Molecules IV Diatomic Molecules V Formulas Names VI Chemical Reactions Outline of Current Lecture I Characteristics of Chemical Equations II Balancing Equations III Balancing Equations Examples IV Ozone What is it V Atomic Structure Periodicity Current Lecture I II Characteristics of Chemical Equations a Can t create or destroy atoms Can t change an atom into another kind of atom chemically b H2 O2 H2O c Hydrogen reacts with oxygen to make water d This equation is implying an oxygen atom has been destroyed so therefore we need to balance it 2H2 O2 2H20 e Mg O2 MgO combustion reaction f 2Mg O2 2MgO g The number in front of the element they are talking about is called a coefficient The number behind the element is called a subscript h It s okay to use trial and error when balancing equations Balancing Equations a ID Reactants Products b The reactants in the equation is on the lef c The products in the equation is on the right d Change the coefficient to make the number of atoms on each side equal e DO NOT CHANGE SUBSCRIPTS You cannot just add subscripts wherever you want because you are creating compounds that do not exist f You can only add coefficients g Start with atoms that appear once on each side III IV V h Double check and make sure everything is equal and that you haven t created or destroyed anything i KClO3 O2 KCl decomposition reaction j K Cl are already balanced k The lowest common multiple of 2 and 3 is 6 l Balanced 2KClO3 3O2 2KCl Balancing Equations Examples a C O2 CO BALANCED 2C O2 2CO b H2 Br2 HBr BALANCED H2 Br2 2HBr c K H2O KOH H2 BALANCED 2K 2H2O 2KOH H2 d Zn AgCl ZnCl2 Ag BALANCED Zn 2AgCl ZnCl2 2Ag e NaOH H2SO4 Na2SO4 H2O BALANCED 2NaOH H2SO4 Na2SO4 2H2O f KOH H3PO4 K3PO4 H2O BALANCED 3KOH H3PO4 K3PO4 3H2O Ozone What is it a O3 ozone element i Elemental oxygen different from regular oxygen Three oxygen atoms bonded together b Allotropes Same element



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