during a chemical reaction, bonds in the reactants break and new bonds are made to form the products:
energy is transfered to the reactants to break their bonds-this means bond breaking is endothermic
energy is transfered to the surroundings when making bonds, which means bond making is exothermic.
reactions with high activation energies take longer to start, whereas reactions with low activation energies are faster to start.
mole: 1 mole of any substance contains 6.02 *10^23 atoms of that particular substance.
bond energy: amount of energy needed to break one mole of any particular covalent bond. measured in mol^-1
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