The Chemistry IAA experiment is a big complicated which is why it is explained in this article very clearly. The IAA investigates the properties covalent substances have, in this case, we will be using urea, glucose and salol as the covalent substance. As this IAA exam is 10% of a GCSE in science, it is extremely important to master this exam.
Firstly, let’s identify what the independent and dependant variables are:
Independent Variable – Number of carbon atoms
Dependant Variable – Melting point of substance
Independent variable causes a change in Dependent Variable and it isn’t possible that Dependent Variable could cause a change in Independent Variable. So, the number of carbon atoms causes a change in the melting point.
- Graphite rods x2
- Wires x4
- Crocodile clips x2
- 1 set of batteries
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| The circuit required in this experiment |
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| Diagram showing graphite rods in sample solution |
11) Place the test tube in the beaker of water and then heat very slowly on a blue flame, ensuring that the water is constantly stirred.
Using distilled water as normal water has potassium and magnesium in it which makes it conduct electricity
Conclusion
(this is where you should use your results and scientific knowledge)
Ultimately, urea, glucose and salol didn’t conduct as a solid neither as a liquid. However, we found that the melting point of salol was 41.5 degrees. This shows that covalent bonds don’t conduct electricity. This is because covalent substance (with exception to graphite) share electrons between atoms and therefore don’t have free electrons. This makes the substances not have a flow of electrons therefore charge.
Hi, my investigation was about the electrolysis of salt solution, do you know anything about it?, thanks.
I didn't unfortunately do that experiment for my IAA but I remembered doing an electrolysis experiment which you place an cathode and anode in a solution?
Oh, thanks anyway.
Oh, thanks anywa, oh how can an element with delocalised electrons.
conduct electricity.
If the electrons are de localised, you can agree that the electrons can move as they have no specific location on the element? This means that they are free to move around the element's surface which is a flow of charge. This is why metals are great conductors as the atoms link in a way which free up electrons to move freely.
Thanks, for explaning this to me, I just wanted to ask, why did you say "ou can agree", I just wanted to and thans for the help.
oh sorry, I ment "you can agree". Thanks.
Just a way of confirming with you so you I know you know what I'm talking about.
Oh right. Thnaks.
Oh, sorry, I ment thanks.
I meant "meant"
did you do one on cracking? chemistry iaa gcse??
No sorry, if you go to the top of the page and type in 'chemistry iaa', you will see all the iaas i have to offer.