Skip to content
Back to quiz
6. What is the effect of temperature increase on reaction rate?
- Increases, due to more frequent collisions and greater proportion of successful collisions
- Decreases, due to less particle collisions
- Increases due to all of the particle collisions becoming successful
7. Using two given equations, how can you spot a catalyst?
- Catalyst present in reactants of first reaction and products in second reaction. Intermediate is also formed.
- 2 new compounds form, alongside an intermediate
- The reaction produces water or carbon dioxide
8. A lower activation energy means the reaction rate will be?
- High
- Low
- The same as normal
9. What happens to a Maxwell-Boltzman curve if temperature is increased?
- Curve moves down & to the right
- Curves moves down & to the left
- Curve moves up & to the right
10. What factors increase rate of reaction by causing more frequent collisions per unit of time?
- surface area only
- concentration,pressure and surface area
- time, concentration and surface area
11. What do Maxwell-Boltzman curves show?
- The amount of energy transferred between particles in a reaction
- Number of molecules with a particular energy at a given tempurature
- Number of bonds being broken in a reaction
12. What is a 'successful' particle collision?
- collision that produces more product
- collision that exceeds the activation energy
- collision that doesnt affect reaction rate
13. What factor affects the proportion of successful particle collisions in a reaction?
- Tempurature
- Surface area
- Concentration
14. How do catalysts work?
- By providing an alternative reaction path by lowering the activation energy
- By providing extra oxygen for the reaction
- By starting and stopping the reaction often
15. What units are used for reaction rate from a graph?
16. how can you work out reaction rate from a graph?
- change in y / change in x
- change in x / change in y
- change in y x change in x
17. How can reaction rate be calculated with a changing concentration?
- change in concentration/change in time
- change in time/change in concentration
- change in concentration x change in time
18. How can percentage error be reduced?
- Use equipment with lower error & use larger masses
- Use smaller masses & equipment with lower error
- Only larger masses can reduce percentage error
19. If reactants have high bond enthalpies, what does this mean for the activation energy?
- It won't change
- It will be high
- It will be low
20. In catalyzed reactions, the 'intermediate' is...
- A chemical formed during a reaction which is not present by the end, shows the alternate reaction path
- A chemical present in all compounds involved in the reaction
- A chemical formed during a reaction which is still present by the end of the reaction, it is the catalyst.