Topic 8

Question 1

Reaction rate

Answer 1

a measure of how fast a reaction occurs

Question 2

4 ways to speed up a reaction

Answer 2

• Increase the temperature
• Increase the surface area
• Increase the concentration
• Agitation

Question 3

Catalyst

Answer 3

a substance that speed up the rate of a reaction without be changed itself (eg.) enzyme

Question 4

Inhibitors

Answer 4

substances that slow down a chemical reaction

eg. certain bacteria

Question 5

Corrosion

Answer 5

oxidation of metals or rocks when exposed to air or moisture

common type is rust

Question 6

Combustion

Answer 6

Highly exothermic combination of a substance with oxygen

• OXYGEN always a reactant in combustion
• CO2 and water are common products

Question 7

Galvanisation and electroplating

Answer 7

Galvanisation is the process of coating metals with a thin layer of zinc. This makes it more resistant to corrosion

Electroplating is the process of covering a metal with another metal by electrolysis