47:11 BRE
Which timeline best shows the history of the development of cell theory?
1665
Virchow
1838 1855
Schleiden Hooke
1000
1700
1076
Schwann
1600
1500
1830
Leeuwenhoek
1665
Hooke
1838
Schleiden
1855
Virchow
1600
1700
1078
Leeuwenhoek
18.00
1300
1839
Schwann
1065
Hooke
1838
Leeuwenhoek
1855
Virchow
1600
1676
1700
Schleiden
1500
1839
Schwann
1865
Virchow
1838
Schwann
1855
Hooke
1600
1700
1076
Leeuwenhoek
1800
1500
1830
Schleiden
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it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.