Equations. Chemical Reaction When a substance goes through a reaction and changes into another...
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Transcript of Equations. Chemical Reaction When a substance goes through a reaction and changes into another...
Equations
Chemical ReactionWhen a substance
goes through a reaction and changes
into another substance.
Chemical EquationsA formula which
shows how elements or compounds react to form new compounds
2H+ + O-2 H2O
Parts of a chemical equations
• Reactants
• Yield Sign
• Products
ReactantsThe elements or
compounds that are found on the left side
of the yield sign
Yield SignAn arrow found in the equation which works
like an equal sign
Products
The elements or compounds that are
found on the right side of the yield sign
Coefficient
Is the number found in front of an ion or
compound. It tells the number of that ion or compound you have
Balanced Equation
For each element in a chemical equation, the same number of each element must be found on the left side of the
arrow as on the right side
All chemical equations must be balanced.
To balance an equation, you can change the
coefficient. However, you can never, never, never change the subscript.
Symbols used in Chemical Equations
(l) The chemical is a liquid.
(s) The chemical is a solid.
(g) The chemical is a gas.
(aq) The chemical is aqueous (dissolved in water).
Synthesis Reactions
A reaction where the reactants combine to
form a bigger compound (also known as combination)
Synthesis Reactions
2H+ + O-2 H2O
Decomposition Reaction
A reaction where the reactants break down
(decompose)
Decomposition ReactionH2O 2H+ + O-2
Single Displacement Reaction
A reaction where one element replaces another element in a compound
Single Displacement Reaction
2Al3+ + 3Ag2S Al2S3 + 6Ag2+
Double Displacement Reactions
A reaction where the positive ion of two
compounds switch, which forms two new compounds
Double Displacement Reactions
HCl + NaOH NaCl + H2O
Combustion
A reaction in which a compound (often
carbon) reacts with oxygen
CombustionC + O2 CO2
CH4 + 2O2 CO2 + 2H2O
C3H8 + 5O2 3CO2 + 4H2O
C6H12O6 + 6O2 6CO2 + 6H2O
Redox ReactionsA reaction where one
compound loses electrons and becomes a smaller compound, while another compound gains
electrons and becomes a bigger compound.
Redox Reactions
C6H12O6 + 6O2 6CO2 + 6H2O
Oxidized Compound
The compound that loses electrons and becomes a
smaller compound
Reduced Compound
The compound that gains electrons and becomes a
bigger compound
Oxidation-Reduction Reaction
Another name for the Redox Reaction