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Chemical Reactions

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by

Emily Cao

on 19 November 2014

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Transcript of Chemical Reactions

substances that are present before the chemical change happens
what we start out in a chemical reaction

Chemical Reactions
Indicators
Synthesis Reactions
two or more substances react and combine to yield a more complex substance
Reactants
Chemical Reactions
Products
The Law of the Conservation of Matter
Decomposition Reactions
Single Replacement (Displacement)
Double Replacement (Displacement)
Combustion
substances that are formed during the chemical change
the outcome of a chemical reaction
Color Change
Changes color as it oxides, reacts with oxygen in the air called oxidation.

Energy Change
Precipitate Formation
When two liquids are mixed together (in a chemical reaction), they form a solid that falls out/precipitates out.

Gas Productions
Anytime you have gas productions from a reaction, then you have more than likely had a chemical change or chemical reaction.

Endothermic
Exothermic
by Emily
when one element replaces another element in a compound

- where ions in the 2 reactants switch place
- the positive ion drops the original negative ion and bond with the others
- kept balanced (positive and negative)

When a hydrocarbon reacts with oxygen to form carbon dioxide and water.
A
B
AB
AB
A
B
the separation of a chemical compound
into elements or simpler compounds

reactants yield into products
A
B
reactants
reactants
AB
product
A
B
C
A
C
B
What are chemical reactions in general?
A
B
C
D
A
D
C
B
energy released
thermal or light energy
temperature increases
energy absorbed
thermal energy absorbed from the surroundings
results in temperature decreases
We know that a chemical reaction has taken place because when you see the precipitate fall out of the liquid.
means burning
Ca
O
CaO
NaCl
Na
Cl
A rearrangement process of the structures in a substance.
Example
Example


NaCl + KBr
NaBr + KCl
Sodium Chloride + Potassium Bromine
Sodium Bromine + Potassium Chloride
A sign of gas production is when bubbles start to appear.
Silver Nitrate + Copper
AgNo + Cu
3
CuNo + Ag
3
Copper Nitrate + Silver
Matter cannot be created or destroyed.

Reaction Formulas
The format you write the product and chemical reaction in.
Example
CH + 2O
CO + 2H O
4
2
2
2
methane + oxygen
carbon dioxide + water
reactant
reactant
product
reactant
product
reactant
reactant
reactant
reactant
product
product
product
product
product
product
product
reactant
reactant
reactant
reactant
Meaning matter can be changed
So matter that wasn't in the reactant can't be in the product
And matter that was in the reactant has to be in the product
Double Replacement (Displacement) Reaction
Example
When a Alka-Seltzer tablet is dropped in water, bubbles will start to appear.
Full transcript