Rates of reaction

When is a reaction rate fastest?

• At the start

• In the middle

• Towards the end

• It is the same rate all the way through

What must ALWAYS be measured to calculate the rate of reaction?

• Mass of product

• Mass of reactant

• Volume of gas produced

• Time

How can the volume of a gas be measured?

• Beaker

• Measuring cylinder

• Gas syringe

• Volumetric Pipette

Which of the following happens to speed up a reaction by increasing the temperature?

• Particles have more kinetic energy

• Particles collide more

• Particles collide more frequently

• There are more successful collisions

• The particles have more activation energy

Which of the following happens when concentration of acid is increased when magnesium reacts with sulfuric acid?

• Particle move faster

• Particles gain more energy

• There are more particles

• There are more particles in the same volume

• There are more frequent collisions

Why does powdered calcium carbonate react faster than lumps of calcium carbonate?

• Powder particles have more energy

• There is a greater surface area with a powder

• Particles move faster in a powder

• More frequent collisions happen

How does a catalyst increase the rate of a reaction?

• It lowers activation energy

• It provides an alternative route/path for the reaction

• There will be more successful collisions

• The catalyst gives energy to the reactants

210cm3 of gas is produced by a reaction in 2 minutes. The rate of reaction is (a)   cm3/second

If a reaction is taking place, and the measurements are g of solid used and seconds, the units for this reaction are (a)