Match the numbers to the letters [not all terms are used] 1- a chemical reaction that absorbs thermal energy

2- a chemical reaction that releases thermal energy

3- a substance that lowers the activation energy of a reaction

4- a substance that slows or stops a chemical reaction

5- how quickly a chemical reaction occurs

A- catalyst

B- reaction rate

C- endothermic

D- inhibitor

E- concentration

F- exothermic

G- reaction rate