1. 5 week plan
Each week you will have 2 single lessons and 1 double lesson. In those lessons you will learn aspects from Modern Analytical Techniques (MAT) II and Kinetics II. Using the knowledge from Kinetics II you will then plan and carry out an investigation into rates of reaction. The investigation write up will be due in September and is an entrance requirement for Y13. Wk
Single 1
Single 2
Double 1
Kinetics II
Lesson 1
Lesson 2
MAT II 2
Lesson 3
Mini test 3
Rates investigation Intro
Rates investigation trials 4
Test
Rates investigation trials / experiment 5
Rates investigation Experiment
No lessons

2. Kinetics II
Lesson Lesson Lesson Lesson 4 (test)

3. H/W from last lesson
2nd order

4. H/W from last lesson
1st order

5. Kinetics II – Lesson 2 Starter… H/W…
If you miss a session you MUST download the PowerPoint from the shared area and collect associated materials, this is your responsibility.
Starter…
Calcium carbonate reacts with hydrochloric acid to a solution and a gas.
Write a balanced symbol equation.
What method would you use to measure the rate?
What is the ratio of HCl to CaCO3?
H/W…
Complete the graphs using excel from today’s lesson
Card sort separate
You must complete all homeworks or you will not be allowed onto Y13 chemistry. No excuses

6. CaCO3(s) + 2HCl  CaCl2 + H2O + CO2
Decomposition of H2O2
CaCO3(s) + 2HCl  CaCl2 + H2O + CO2 :

7. Ways to measure rate
You can measure the rate of a reaction by either using an initial rate method or a continuous monitoring method.
Initial rate
Concentration is varied and time is measured for the initial part of the reaction
Continuous monitoring
Time is varied and concentration is measure for whole reaction

8. Task
Your task is to investigate the order of the reaction using the two different ways to measure rate. In both cases the acid will be limiting and the CaCO3 will be in excess.
Method 1 – initial rate
Set up the experiment to measure a gas volume.
Place 25cm3 of 2M HCl into a conical flask connected to the gas syringe.
Place a large stone of CaCO3 into the flask ensuring that the stopper is replaced quickly.
Record the time taken for 50cm3 of gas to be collected.
Repeat for 1.75M, 1.5M, 1.25M and 1M HCl using the same stone.
Repeat 2 more times
Method 2 – Continuous monitoring
Set up the experiment to measure a gas volume.
Place 25cm3 of 2M HCl into a conical flask connected to the gas syringe.
Place a large stone of CaCO3 into the flask ensuring that the stopper is replaced quickly.
Record the volume of of CO2 collected every 20s until 100cm3 is collected.
Repeat 2 more times.

9. Tables
Your task is to investigate the order of the reaction using the two different ways to measure rate. In both cases the acid will be limiting and the CaCO3 will be in excess.
Method 1
Time
(s)
vol CO2
(cm3)
Mol HCl
(mol)
[HCl)
(mol dm-3) 20 40 60 80
100
120
[H2O2]
(mol dm-3)
Time
(s)
rate
(s-1)
1.00
1.25
1.50
1.75
2.00

10. Processing
Use the excel file to process your results. See video on Intranet.
Method 1
1.Plot a graph of time vs concentration.
2.Calculate 1/t to get the rate.
3.Plot concentration vs rate.
4.Use the shape to determine the order.
Method 2
Plot a graph of time vs concentration.
2.Calculate the gradient every 20 seconds
3. Plot concentration vs rate.
4. Use the shape to determine the order.