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Elements and reactions

Speed of reactions - Test


Questions 1- 4 are about the following experiment. A pupil places a 10g disc of potato into 1 mol/l hydrogen peroxide solution. The solution is at room temperature - about 20oC. The potato has a biological catalyst inside it that breaks the hydrogen peroxide down to water and oxygen gas.

What term is used to describe a biological catalyst such as catalase?


What could the pupil do to the 10g potato disc to guarantee an increase in the number of oxygen gas bubbles given off per minute?


What would happen to the number of bubbles per minute if she used a 2 mol/l hydrogen peroxide solution instead of the original 1mol/l?


What would happen to the number of bubbles if the temperature was decreased to 5oC?


Questions 5-7 are about the following experiment between magnesium and nitric acid.


Identify the two experiments which could be used to show the effect of concentration on speed of reaction.


Identify the experiment with the slowest speed of reaction.


A and E would be a way of investigating which variable and how it affects the speed of reaction?


Questions 8-10 are about the following passage. When recycling catalyst materials from a car, the exhaust system is cut open then the muffler burned away using a blow torch. This allows you to extract a mesh of pure metal that can be reused or sold.

The metal mesh helps to speed up the conversion of certain gases to less harmful gases. What term would best describe this metal?


Originally the metal mesh had a mass of 245g. When it is extracted 5 years later, what mass would you expect it to have?


What metal might you expect to find in the recovered mesh?