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Hydrogen "Squeaky Pop" Test
Transcript of Hydrogen "Squeaky Pop" Test
1. Describe what happened to the magnesium when you placed it into the test tube?
2. Why do you place your thumb over the test tube?
3. What would happen if you didnt place your thumb over the test tube?
4. Why didnt the gas burn?
5. What would you expect if you only held your thumb over the test tube for half the time?
6. Hydrogen gas was produced but what other products get produced from a metal and acid?
Hydrogen 'Squeaky Pop' Test
What have you learn't today :)
All acids contain hydrogen atoms.
Apart from hydrochloric acid, this is not clear from their names, but you can tell they contain hydrogen from their chemical formula.
Chemical symbol for hydrogen is H.
Metals react with Acids
Acids react with most metals to produce a salt.
This reaction causes hydrogen gas to be produced and released.
The general word equation for this reaction is:
metal + acid = salt + hydrogen
1. Pour about 2cm depth of diluted acid into a test tube.
2. Add a small piece of magnesium to the acid in the test tube. Immediately put your finger or thumb over the end of the test tube.
3. After a few minutes, bubbles of Hydrogen will have come off the magnesium and there should be a high pressure on your thumb.
4. Get another student to place a lighted splint over the end of the test tube as you take your finger or thumb away.
6. Then listen there should be a distinctive ‘squeaky pop’ sound. If you do not hear a ‘squeaky pop’ then try the experiment again.
7. Leave the test tube in the rack.
8. Repeat experiment until everyone has had a go then answer the questions on the board.
- Test Tubes
- Test tube rack
- Magnesium strip
- Diluted acid
- Safety Glasses
Name of acid and Chemical formula of acid
+ hydrochloric acid =
+ nitric acid =
+ sulphuric acid =
+ carbonic acid =
- You must wear safety glasses at all times.
- Leave test tube in rack so that you do not drop it and get acid on yourself.
- No running around lab
- When placing your thumb over test tube, be careful not to break the glass.
But what does this have to do with the 'spueaky pop' test?
The salt produced depends upon the metal and the acid.
Here is an example:
magnesium + hydrochloric acid = magnesium chloride + hydrogen
doesn't matter which metal or acid is used, if there is a reaction we always get hydrogen gas as well as the salt.
Metal + Acid
Hydrogen gas + Salt
When Hydrogen burns it makes a squeaky pop sound
L.I - To understand, investigate and implement a scientific concept into scratch