Unit 1 Rates of Reaction

If 5cm3 of gas is produced in 20 secs what is the average rate of reaction?

• 5cm3s-1

• 0.25cm3s-1

• 4cm3s-1

Which would not speed up a chemical reaction?

• Using a large beaker

• Increasing the concentration

• Decreasing particle size

• adding a catalyst

Which is to true true of catalysts?

• They speed up a chemical reaction

• They can be used over and over again

• They change during the chemical reaction

• Enzymes are biological catalysts

What can be said about the green line?

• it is a faster rate of reaction

• It produces same volume of product as red line

• Half the volume of reactants has been used

Which would have the slowest rate of reaction

• Magnesium ribbon 1M HCl at 20 degrees

• Magnesium powder 1M HCl at 20degrees

• Magnesium ribbon 0.5M HCl at 10degrees

• Magnesium powder 0.5M HCl at 10degrees

Increasing the temperature increases the rate of reaction because ....

• There is more particles so more collisions

• There is larger surface area so more collisions

• Particles have more kinetic energy so more collisions

why is the reaction fastest at the start ?

• The reactants are in their greatest concentration

• this statement is untrue the reaction is same rate through out whole reaction

Which statement is true

• Large logs will burn faster than wood chips

• 500mg paracetamol will work faster than 200mg

• Cars take longer to start on a warm day

• A catalyst will have no effect on a reaction rate

which will have fastest rate of reaction.

• Zinc strips 0.5 M HCL

• Zinc powder 0.25M HCL

• Zinc powder 0.5 M HCl

• Zinc strips 0.25 M HCl

Which will increase the rate of a reaction?

• Increasing the beaker volume

• Lowering the temperature

• using smaller pieces of solid

• diltuing a solution