UNIT 1 : Rate Of Reactions Flashcards
1
Q
How can the rate of reaction be increased?
A
- increasing the concentration
- increasing the surface area by decreasing the particle size
- increasing the temperature
- Catalyst
2
Q
what are the properties of catalysts?
A
- speed up chemical reactions
- are not used up during the reaction
- can be recovered chemically unchanged
3
Q
what is an example of a catalyst used industrialy?
A
- car exhaust systems with catalytic converters.
- Speed up the conversion of harmful gases into less harmful gases.
- poisoned by lead.
4
Q
what is an example of a biological catalyst?
A
- enzyme called amylase which speeds up the breakdown of starch
5
Q
what is an example of enzymes used industrially?
A
- cheese
- beer
- yoghurt
- some medicines
- biological washing powders
6
Q
when is the rate of reaction most rapid?
A
At the start of the reaction
7
Q
how do u tell what reaction is faster when shown in graphs?
A
The steeper the slope, the faster the rate of reaction
8
Q
How do u calculate Average rate of reaction?
A
measured change ÷ time taken for the change
9
Q
what does the endpoint in a graph mean?
A
The endpoint is the time at which no more products are produced
