S3 Chemistry Section 1 and 2

In a chemical reaction - what do you call the substances at the beginning before the reaction?

• Reactants

• Products

In a chemical reaction the new substance(s) made are known as the

• Reactants

• Products

Which of these changes would speed up a chemical reaction?

• Decrease temperature

• Increase particle size

• Increase concentration

• decrease concentration

Which of these changes would speed up a chemical reaction

• Decrease concentration

• Increase Particle size

• Decrease Temperature

• decrease particle size

What name is given to a substance that can speed up a chemical reaction without being used up?

(a)  

Which of these is the correct equation for calculating the average rate of a reaction?

• Average rate = change in quantity/change in time

• Average rate = change in time /change in quantity

Calculate the average rate of the reaction between 0 and 5 seconds in cm3/s

• 5

• 2

• 0.5

• 1

In the graph, is reaction 1 or reaction 2 faster?

• Reaction 1

• Reaction2

The Halogens are in which group of the Periodic Table

• 1

• 2

• 7

• 8

The Alkaline Earth Metals are in which group of the Periodic Table?

• 1

• 2

• 7

• 8