1. 23 / Tuesday
Kaupapa:
Describe how to perform a common laboratory test for carbon dioxide

2. Do you remember? Define “element” Define “compound”
Describe how hydrogen gas is tested
Describe how oxygen gas is tested

3. Gas Tests

4. How can we test for the presence of oxygen?
Splint Test!

5. Splint Test
In the presence of oxygen, a glowing splint will catch fire again.
This is called the “splint test” – the test for oxygen.

6. Squeaky Pop Test

7. Squeaky Pop Test
When hydrogen gas is brought to a flame, it burns with a “squeaky pop” noise.
This is called “Squeaky pop test” – the test for hydrogen gas.

8. Combustion (burning)

10. Pouring carbon dioxide

11. How can we test for the presence of CO2?
Limewater Test

12. Limewater Test
In the presence of carbon dioxide gas, clear limewater will turn cloudy.
This is called “limewater test” – the test for carbon dioxide gas.

13. Homework – due Thursday

14. What have we learnt today?
Describe how we test for carbon dioxide