Mean rate of reaction and graphs

What are the units for rate of reaction?

• g/s

• cm2/s

• cm3/s

• cm3 or g/hour

What is the equation for calculating mean rate of reaction?

• volume of product formed / time

• amount of product lost / time

• distance/ time

• time / volume of product formed

What is meant by 'rate of reaction'?

• How vigorously a reaction takes place

• How much a reaction occurs over time

• How quickly you can force a reaction to take place

List pieces of equipment which could be used to measure the volume of gas produced

• An inverted measuring cylinder

• A balance

• A thermometer

• A gas syringe

• A test tube

Which piece of equipment is used to measure mass?

• Scales

• Balance

• Weighing boat

• Gas syringe

Give a piece of equipment that is always really important when measuring the RATE of a reaction

• Thermometer

• Gas syringe

• Balance

• Stopwatch

When measuring the loss of carbon dioxide gas over time, why is cotton wool placed in the neck of the conical flask

• To stop the carbon dioxide gas escaping

• To make sure no gas or acid gets in our eyes

• To make sure only gas is escaping, not acid

Which variable should go on the y axis?

• The amount/ volume of product produced or lost

• Time

If 2g of product is lost in the first 10 seconds of the reaction, calculate the mean rate of reaction

• 0.002g/s

• 0.5g/s

• 0.2g/s

• 0.2cm3/s

Why does the graph level off when plotting data for the rate of reaction?

• The reaction has finished

• There is no more gas being produced/ gas being lost

• One of the reactants has been used up

• The rate of reaction is zero