Unit Two: Rate of Reaction

Question 1

Name three examples of different speeds of reactions:

Answer 1

Slow- rusting of iron
Medium- a metal reacting with acid to produce a gentle stream of bubbles
Fast- an explosion

Question 2

What four things do the rate rate of a reaction depend on?

Answer 2

Temperature
Concentration (pressure for gases)
Catalyst
Surface area of solids (or size of solid pieces)

Question 3

Precipitation:

Answer 3

Precipitation: when the product of a reaction is a precipitate which clouds the solution

1. Observe a mark through the solution and measure how long it takes to disappear
2. The quicker the mark disappears, the quicker the reaction
3. Only works when the initial solution is quite see through
4. Subjective

Question 4

What are the ways which the rate of reaction can be measured?

Answer 4

Precipitation, change in mass, volume of gas given off

Question 5

Change in mass (usually has given off):

Answer 5

1. Carried out on a mass balance
2. The quicker the reading on the balance drops, the faster the reaction
3. Rate of reaction graphs are easy to plot using this method
4. Most accurate

Question 6

The volume of gas given off:

Answer 6

1. Involves the use of a gas syringe
2. The more gas given off during a given time interval, the faster the reaction
3. Rate of reaction graph (plot)
4. Quite accurate (measures to nearest mm)