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Exothermic and Endothermic Reactions (Exothermic-chemical reaction …
Exothermic and Endothermic Reactions
Exothermic-chemical reaction releases energy
Products= little energy
Reactants= lots of energy
Example
Combustion of propane
propane+oxygen= heat Equation: C3H8+5O2-----> 3CO2+4H2O+2220 kJ
Types of exothermic reactions- combustion, freezing
energy is on right side
difference between energy of reactants and products= energy released
Endothermic- chemical reaction takes in energy
Products= lots of energy
Reactants= little energy
energy on left side
Example
decomposing mercury(II) oxide
heating (adding energy to) mercury oxide
Equation= 2HgO+181.7 kJ ----> 2Hg+O2
difference between energy of reactants and products= energy needed
Type of endothermic reaction- melting/heating
Similarties
Follows law of conservation of energy
classifies chemical equations
determines movement of energy
energy peak= broken bonds
Differences
Energy
Exothermic- Energy is released
Endothermic- Energy is absorbed
Equations
Exothermic- energy on the right
Ex. C3H8+5O2-----> 3CO2+4H2O+2220 kJ
Endothermic- energy on left
Ex. 2HgO+181.7 kJ ----> 2Hg+O2
