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Chapter 7 chem - Coggle Diagram
Chapter 7 chem
Changes
Physical changes
no new substances
easily reversible
examples
dissolving
condensing
freezing
Chemical changes
new substances
Heat is taken or given out :fire:
not easily reversible
Exothermic
energy is released
Endothermic
energy is absorbed
Energy transfer in chemical reactions
Bond breaking
endothermic
Bond making
exothermic
Bond energy
Energy required to break one mole of a particular bond
Fuels and energy production
Fuels
Coal
formed by decay of plants
Fuel cells
Energy from electrochemical cells