GCSE Chemistry - Properties of Simple Molecular Substances & Giant Covalent Structures #17

Covalent bonds are very strong can be used to make a range of substances from the very small 'Simple Molecular Substances' to the large 'Giant Covalent Structures'. Learn how their properties differ and why!

[@Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are:
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Amadeus & Tom

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Nice one 🙌 glad it could help you out!! Good luck for tomorrow ✌️

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I just wanted to know whether we should learn to draw these 3D diagrams in our chemistry IGCSE?

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You don't need to, at least according to my teachers

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doesnt graphite have imf between the layers? and if so does that not affect the bp and mp?

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The artwork makes it easier to understand

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Good stuff hope it went well?

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boiling point increases as you go down the group as the molecules get larger

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Question: Are covalent bond intramolecular forces?

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(love the vids btw, best science youtuber out there)

[@TheIndianSpider]

👍 Thanks a lot!

[@daniella7115]

How come the melting & boiling points of single molecular substances are dependent on the intermolecular forces not bonds, but the melting & boiling points of giant covalent structures are dependent on the covalent bonds as opposed to intermolecular forces?

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[@Cognitoedu]

Yes there are! Stay tuned!!

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[@JoshuaLokz]

How to know if a substance is a simple or giant covalent molecule based on its structural formula?

[@Cognitoedu]

Hi, you can sort of figure it out, but it's quite complicated. It's best to just memorise the few examples of giant covalent structures.

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What is exactly meant by free electrons? I never understood that part.

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The electrons are not on the outer shell of the atom so are free to move about

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Simple covalent molecules MOSTLY do not conduct electricity. Aqueous solutions of acids and ammonia, however, do conduct electricity.

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Why are there more intermolecular forces between bigger molecules???????????

[@UZU919]

There are more molecules on giant covalent structures so realistically more intermolecular forces to overcome

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[@telepathyavos3786]

This video is quite confusing. It first says that the bonds between the atoms do not break, instead, the intermolecular forces break. This was said in the part about simple covalent structures. However, for the giant covalent structures, he states that the covalent bonds will have to be broken, instead of the intermolecular forces.

[@Cognitoedu]

Hi there - yeah that is the main confusing point in this topic. For simple molecular substances it's the intermolecular forces (weak forces between the molecules) that need to break to melt the substance. Whereas for giant covalent structures (like diamond), it's the strong covalent bonds that have to be broken.

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Mitochondria

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