By Aiyana

• Exothermic reactions release energy •They are hot and may steam

Exothermic Reactions

Formula of reaction:2 Al(s ) + 3 Br2(l ) --> 2 AlBr3(s )(Aluminum and liquid Bromine)

Endothermic Reaction

• Endothermic reaction absorb energy •They feel very cold

Formula for reaction:H2O + Ammonium Nitrate H2OAN (Water and ammonium Nitrate)

Synthesis

• In a synthesis reaction two or more chemicals bond together forming one new substance.

•Generic formula: A + B AB

Formula for reaction:2K(s) + Cl2(g) 2KCl(s)(This is potassium chloride and chlorine gas)

Decomposition

• In a decomposition reaction one substance breaks down into two or more separate substances

• Generic Formula: AB A + B

Formula of Reaction:2 HgO 2 Hg + O2(Oxygen and Mercury)

Single Replacement

• In a single replacement reaction one element knocks another element out of a compound.

• Generic Formula: AB + X AX + B

Formula of Reaction:Zn + 2HCl H2 + ZnCl2(Zinc and Hydrochloric acid)

Double Replacement

• In a double replacement the two compounds switch ions with each other

• Generic formula: AB + XY AX + BY

Formula for reaction:2KI(aq) + Pb(NO3)2(aq) 2KNO3(aq) +PbI(s)(Potassium iodine and lead and nitrogen oxygen)

Combustion

• A combustion reaction is when a compound burns in oxygen gas

•Oxygen will always be a reactant

•Generic formula: A + O2

Formula for reaction:CH4 + 202 -> CO2 + 2H2O(Carbon hydrogen and oxygen)

RESOURCES http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA3/STILLS/ALBR/ALBR/64JPG48/7.JPG

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