catalyst Flashcards
1
Q
what is a catalyst
A
- a catalyst increases the rate of reaction without being used up itself
- it lowers the activation energy needed for a reaction to start by providing an alternative pathway
2
Q
how to identify is a substance is a catalyst or not
A
- if there is a solid yo think is a catalyst
- measure the reaction rate between two substances without the solid
- then repeat the experiment again with the same mass or volume of the two substances with a known mass of the solid
- if the rat of reaction has increased then it may have been a solid
- to double check the catalyst haste been used up filter, dry and measure the mass is still there
3
Q
what are enzymes an example of
A
- biological enzymes
4
Q
what do enzymes do
A
- speed up the rate of chemical reactions in living cells
5
Q
example of reactions catalyzed by enzymes
A
- respiration
- photosynthesis
- protein synthesis
