Rate Of Reaction (3)

Question 1

How can the rate of reaction be increased?

Answer 1

By using powdered reactant rather than a lump

Question 2

Describe an explosion

Answer 2

A very fast reaction which releases a large volume of gaseous products

Question 3

Describe a catalyst

Answer 3

A substance which changes the rate of reaction and is unchanged at the end of the reaction

Question 4

Understand why only a small amount of a catalyst is needed to catalyse large amounts of reactants and that a catalyst is specific to a particular reaction

Answer 4

Only a very small amount of catalyst is needed to increase the rate of reaction between large amounts of reactants.
Iron - making ammonia from nitrogen and hydrogen
Platinum- making ammonia from nitrogen and hydrogen
Vanadium oxide - making sulfuric acid

Question 5

Explain the dangers of fine combustible powders in factories

Answer 5

The dust of the material can mix with air and could cause an explosion if there is a spark

Question 6

Explain in terms of reacting particles and surface area the difference in the rate of reaction between a lump and powdered reactant

Answer 6

A lump has a small surface area so there are less particles exposed whereas a powdered reactant has a big surface area meaning that there are more particles exposed.

Question 7

Explain in terms of collisions between reacting particles the difference in the rate of reaction between a lump and powdered reactant

Answer 7

A lump has few collisions as there are less particles on the surface for the other reactants to react with. Whereas a powdered reactant has more collisions as there are more particles on the surface for the other reactants to react with.

Question 8

What can increase the rate of reaction?

Answer 8

The addition of a catalyst