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Page 1: Chemical Reactions
Page 2: Chemical Reactions

–Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken

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–Chemical reactions involve changes in matter, the making of new materials with new properties, and energy changes.

                                       

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–Symbols represent elements, formulas describe compounds, chemical equations describe a chemical reaction

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Items to the LEFT of the arrow in a chemical equation are called

REACTANTS.

Na + Cl NaCl

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Items to the right of the

arrow are called

PRODUCTS.

Ex: Na + Cl NaCl

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Important NOTE:

No matter how many reactants and products are involved, all atoms present at the start of a reaction are present at the end.

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THE TOTAL MASS OF THE REACTANTS MUST EQUAL THE TOTAL MASS OF PRODUCTS.

MATTER IS NEVER CREATED OR DESTROYED.

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A number that tells how many molecules of a substance are involved in a

chemical reaction.

A coefficient of 1 is not written.

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Subscripts• A subscript indicates how many

atoms of an element are in a compound

Ex. H2SO4

H= 2 S = 1 O = 4

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Subscripts vs. Subscripts vs. CoefficientsCoefficients

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+ -- used to separate two reactants or products.

(yields) Separates reactants and products.

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Reactions that release heat.

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Reactions that absorb heat.

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A substance that speeds up chemical reactions.

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A substance that slows down a chemical reaction.

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Reactions that have hydrocarbons (CH4) and oxygen as reactants, and carbon dioxide and water as products.

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Example:

C3H8 + 5O2 3CO2 + 4H2O

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2Na + Cl2 2NaCl

Na2O + CO2 Na2CO3

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Starts with one reactant and ends with 2 or more products.

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2 KClO3 2KCl+3O2

2NaCl 2Na + Cl2

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One compound and a free element that recombine to yield a new compound and new free element.

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Fe + CuSO4 Cu + FeSO4

2Na + 2HCl H2 + 2NaCl

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Starts with 2 compounds as reactants. These recombine to form 2 new compounds as products.

+ +

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NaCl + AgNO3 NaNO3 + AgCl

KOH + HNO3 HOH + KNO3

C:\Documents and Settings\mswilliams\Local Settings\Temporary Internet Files\OLK1B5\types.htm

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The first slide shows the unbalanced equation, followed

by the balanced equation.

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C + O2 ----- CO2

Unbalanced

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C + O2 ----- CO2

Balanced

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NaCl ---- Na + Cl2

Unbalanced

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2NaCl ---- 2Na + Cl2

Balanced

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FeCl2 + K2S -- FeS + KCl

Unbalanced

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FeCl2 + K2S -- FeS + 2KCl

Balanced

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C2H4 + O2 CO2 + H2O

Unbalanced

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C2H4 + 3O2 2CO2 + 2H2O

Balanced

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AlCl3 + Na2CO3 Al2(CO3)3 + NaCl

Unbalanced

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2AlCl3 + 3Na2CO3 Al2(CO3)3 + 6NaCl

Balanced

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CS2 + O2 CO2 + SO2

Unbalanced

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CS2 + 3O2 CO2 + 2SO2

Balanced

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Fe + H2O Fe3O4 + H2

Unbalanced

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3Fe + 4H2O Fe3O4 + 4H2

Balanced

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AlCl3 Al + Cl2

Unbalanced

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2AlCl3 2Al + 3Cl2

Balanced

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Na + H2SO4 ---> Na2SO4 + H2

Unbalanced

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2Na + H2SO4 ---> Na2SO4 + H2

Balanced

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Cr + O2 CrO3

Unbalanced

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2Cr + 3O2 2CrO3

Balanced


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