Matter and Particles: Chemical changes: S1

1. 1P5: Thursday 11th
November, 2010
Matter and Particles: Chemical
Changes

2. Homework
• Hand in previous homework today.
• New Homework: due in on Tuesday 16th
November – write this down in your notebooks!!!
– Homework 4. Q1, 2, 3.

3. Let’s review our learning:
hands up please!
• What is a chemical reaction?
• Name some everyday chemical reactions
• What happened when marble chips were put
in the acid?
• What happened to the temperature?
• Was a compound or a mixture produced?
• Can we get the marble chips back out of the
solution?

4. Time for some experiments!
– Aim: Write down the aim of the experiment
– Apparatus: List all the apparatus you use
– Diagram: Draw labelled diagrams for both of
your experiments – use a ruler!
– Method: Describe how you performed the
experiment
– Results: Note down all of your observations

5. Lab Safety
• Ensure all coats are hung up
• Ensure all bags are on rack
• Push stools under desks
• Tie back long hair
• Tuck ties into shirts
• Wear your safety goggles at all times
• Take care when using Bunsen burners
• Leave Bunsen burners to cool before tidying up

6. Experiment A: Burning Magnesium
• CAUTION: Do NOT look directly into the white flame!
• CAUTION: Bunsen burners and tongs will get VERY hot – be
careful! Place hot tongs on heat-proof mat.
• What did the Magnesium look like before burning?
– Note this down in your notebooks
• What did Magnesium look like after burning?
– Note this down in your notebooks
– Leave a few lines clear in your notebook after your
completed write-up

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 is the chemical symbol for Magnesium?
• What happened in the experiment?
• What did Magnesium look like before it was burned?
• What did it look like after it was burned?
• What new product was made?
• Was the new product a compound or a mixture?
• Can we separate the compound back to the elements?
• Where did the Oxygen come from to burn with the
Magnesium?
• What is the chemical symbol for Oxygen?
• What did the solutions look like before they were mixed
together?
• What did the solutions look like after they were mixed?

9. 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!

10. Word Equations
Add this into your notebook after your report on
Experiment A:
Magnesium + Oxygen  Magnesium Oxide
When anything burns it takes in Oxygen from
the air.

11. Conclusions
• Looking back at the three 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