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

[@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: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

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If Giant Covalent Structures are only made of atoms then Silicon Dioxide is an molecule?

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Cheers Oliver - really happy you think it’s helpful 🥳 good luck with all your work!

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Aha thats great to hear - really happy you're continuing to find them useful!

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[@Cognitoedu]

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

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Great video and definitely learned something

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Thanks Odo! Really appreciate the comment :)

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That’s good to hear 🙌

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[@Cognitoedu]

Good stuff hope it went well?

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Cognito yeah good

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

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2:57 Joe Valent bonds Jokes aside love the videos sir thank you

[@dominikfrolec]

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

[@Kylenguru]

thanks you so much for this video i did not know what i was going to write on my exam 😃😃

[@Cognitoedu]

Glad we could help out! 👍

[@hamzasherasmat6593]

Question: Are covalent bond intramolecular forces?

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[@ayaansabirabbasi5370]

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

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How about the order of magnitude? It is in the Edexcel specification, yet I cannot find any clear explanations of it in textbooks, revision guides, revision sites or videos.

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I was gonna make a joke about Sodium, Hydrogen, Bromine and Oxygen but NaHBrO.

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u just got me through my revision with that joke

[@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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I am really thankful for your videos

[@jonb1465]

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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Watching this day bf the test😅

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dont know if youl see this, but what do you thibk will happen with GCSE exams this ya=ear. (love the vids btw, best science youtuber out there)

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[@Cognitoedu]

Yes there are! Stay tuned!!

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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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[@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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[@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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