Introduction to Rates of Reaction

What is meant by 'rate of reaction'?

• A measure of how quickly a reactant is used up

• The rate at which reactants react together

• The rate at which a reaction happens

• A measure of the rate in which a reactant is used up

In the reaction:

 $A\ +\ B\ \longrightarrow\ C\ +\ D$  
What are the reactants?

• A and B

• C and D

• A and C

• B and D

What do you do when measuring how fast products are formed?

• Use a balloon and collect the gas produced

• Allow the gas to escape into the atmosphere

• Use a gas syringe and collect the gas produced

• Breathe in any gas produced

In the video, how was it explained to measure the rate at which products were formed?

• Using a beaker and a gas syringe

• Using a conical flask and gas syringe

• Using a bunsen burner and a gas syringe

• Using a bunsen burner and heat proof mat

What is formed when magnesium reacts with hydrochloric acid?

• Carbon dioxide

• Oxygen

• Hydrogen

• Methane

If you were to measure how fast the reactants are used up, what could you do?

• Place the experiment on a balance and watch the mass go down

• Watch carefully until it looked like it had disappeared

• Place the experiment on a balance and watch the mass go up

• Count to 30

What is the equation for working out the rate when looking at reactants being used up?

• $Rate\ =\ \frac{change\ in\ amount\ of\ product}{time}$

• $Rate\ =\ \frac{time}{change\ in\ the\ amount\ of\ reac\tan t}$

• $Rate\ =\ \frac{change\ in\ the\ amount\ of\ reac\tan t}{time}$

• $Rate\ =\ \frac{time\ }{mass}$

When do I use the equation:
 $Rate\ =\ \frac{1}{time\ taken}$  

• When you are measuring the mass in grams

• When you are measuring the volume in  $cm^3$  

• When there is no mass or volume to measure

• When there is too much mass or volume to measure

How do you work out the units of a rate of reaction?

• What you measured in/time unit used

• Time unit used/ what you measured in

• Just the time unit used

• Just what you measured in

Thinking about graphs...

What is important not to do when drawing a curve?

• Smooth curve

• Missing points out

• Joining up dot to dot

• Starting the beginning