Chemical Equations - PowerPoint PPT Presentation

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Chemical Equations

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Chemical Equations Reactants Products Chemical Reaction chemical reaction is the process by which one or more substances change into one or more new substances. – PowerPoint PPT presentation

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Title: Chemical Equations


1
Chemical Equations
  • Reactants
  • Products

2
Chemical Reaction
  • chemical reaction
  • is the process by which one or more substances
    change into one or more new substances.
  • Reactants
  • the original substances in a chemical reaction.
  • Products
  • the substances that are created in a chemical
    reaction.

Reactants ? Products
3
Chemical Reaction Versus Physical Change
  • chemical change
  • new substance forms with properties that differ
    from original substance
  • physical change
  • changes of state of matter

4
A chemical equation vsWord Equation
  • Word Equation
  • methane oxygen ? carbon dioxide water
  • ---------------------------------------------
  • Chemical Equation
  • ?CH4 ?O2 ? ?CO2 ?H2O

5
Equations and Reaction Information
  • (s) Solid
  • (l) Liquid
  • (g) Gas
  • (aq) Aqueous (dissolved in water)
  • ? Yields
  • Reversible reactions
  • Clip

6
Balancing Equations
  • Conservation of mass
  • The amount and type of atoms starting a reaction
    must be the same as the amount and type of atoms
    after the reaction

7
Balancing Equations
  • coefficient
  • multiplies the number of atoms of each element in
    the formula that follows.
  • H2O 2 hydrogen atoms, 1 oxygen atom
  • 2H2O 4 hydrogen atoms, 2 oxygen atoms

8
Diatomic Elements
  • Elements that when found free in nature are 2
    atoms bonded together
  • H2, N2, O2, F2, Cl2, Br2, and I2
  • Can have other subscripts when in compounds but
    not when alone

9
  • H2O CO2 -----gt C6H12O6 O2
  • Na NaNO3 ---gt Na2O N2

10
Assignment
  • Practice Problems
  • Pgs
  • 269
  • 271
  • 273
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