The document summarizes a chemistry class where students conducted experiments on chemical reactions and reviewed concepts like chemical changes, mixtures, and compounds. It provides instructions for upcoming homework assignments and announces a test on chemical reactions. Students performed experiments involving the reaction of magnesium with oxygen, adding marble chips to hydrochloric acid, and mixing chemical solutions, observing physical changes in each case. The class then reviewed the results and key characteristics of chemical reactions.

1. 1P9: Thursday 11th November, 2010
Matter and Particles: Chemical Changes

2. Homework
• Homework set on Thursday 4th was due on
Monday 8th November…
– Some were great and MERITS were awarded 
– Some were not as great – more effort required please!
– Some were not handed in – very disappointing 
• If this happens again de-merits will be given out
• New Homework: due in on Tuesday 17th
November – write this down in your notebooks!!!
– Homework 3. Q3
– Homework 4. Q1, 2, 3.

3. Let’s review our learning:
hands up please!
• What is a chemical reaction?
• Name some everyday chemical reactions
• Complete the following word equation:
• Magnesium + Oxygen 
• What did Magnesium look like before it was
burned?
• What did it look like after it was burned?
• Was this a mixture or a compound?
• Can we change the Magnesium back to a shiny
metal again?

4. Write up your last Experiment!
– Draw a labelled diagram of the experiment
– What apparatus did you use?
– Describe how you burned the Magnesium
– Note down all your observations:
– What did Magnesium look like before it was
burned?
– What did it look like after?

5. More experiments!
• Today we will be doing 2 more experiments
– A: Adding Marble chips into Hydrochloric Acid
– B: Mixing two solutions together
– You will have about 10 minutes to do each experiment
• For both experiments you will need to:
– draw a labelled diagram
– explain how you did the experiment
– carefully observe and note down what happens

6. Experiment A: marble chips and acid
• Add some Hydrochloric acid into a beaker
• Take the temperature of the acid using the
thermometer
– Note this result down
• Add in some marble chips
– Note down what happens in your notebooks
• Measure the temperature again
– Note this result down

7. Experiment B: Mixing solutions
• Add 2cm depth of solution A into one test tube
– What does this solution look like? Note it down
• Add 2cm depth of solution B into another test tube
– What does this solution look like? Note it down
• Pour the contents of one test tube into another
– What does this mixture look like? Note it down
– Is there anything else there now that wasn’t before?

8. Let’s review our results:
hands up please!
• What happened to the marble chips?
• Was there a temperature change?
• What did the solutions look like before they
were mixed together?
• What did the solutions look like after they
were mixed?

9. Conclusions
• Looking back at the experiments we have done
we can say that:
Chemical reactions have the following things in
common:
– They produce new substances
– They involve a change in temperature
– They involve a change in appearance

10. What’s next?
• Tuesday 17th November
– Hand in your homework for me to check!
– We will be revising Matter and Particles topic for a
TEST on THURSDAY 18th November
• Using your traffic light colours – please let me
know if you have understood chemical
reactions today!