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2.4 Chem. Reactions
Question | Answer |
---|---|
Chemical Reactions | Change substances by breaking and forming chemical bonds |
Reactant | The substance you start off with |
This changes during a chemical reaction | A reactant |
Product | The substance you end up with |
This is the goal of a chemical reaction | Products |
Bond energy | the amount of energy in a bond |
This is at equilibrium when reactants and products form at the same ate | Reaction |
This releases or absorbs energy | Chemical Reaction |
Activation energy | The amount of energy that needs to be absorbed to start a chemical reaction |
Exothermic Reactions | Release more than they absorb |
This is released by the changing reactants | Excess Energy |
This has lower bond energies than reactions | Products |
Endothermic Reactions | Absorb energy |