Uploaded April 2024 | Updated September 2026, 1 hour ago
Find your 9s with PLUS. Click the link to try for free freesciencelessons.co.uk/modules/gcse-chemistry-1-triple
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In this video, we look at the giant covalent molecule graphite. We look at how covalent bonding takes place in graphite and why graphite has delocalised electrons. We then use this to explain why graphite is a soft substance with a high melting and boiling point. We also look at why graphite can conduct both electricity and heat, in terms of the delocalised electrons.
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Chemistry. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
Find your 9s with PLUS. Click the link to try for free freesciencelessons.co.uk/modules/gcse-chemistry-1-triple
Teachers, to get PLUS for your school, email schools@freesciencelessons.co.uk
In this video, we look at the giant covalent molecule graphite. We look at how covalent bonding takes place in graphite and why graphite has delocalised electrons. We then use this to explain why graphite is a soft substance with a high melting and boiling point. We also look at why graphite can conduct both electricity and heat, in terms of the delocalised electrons.
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Chemistry. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
![A Level Biology Revision (Year 13) Excretion and Waste Products
In this video, we look at excretion and waste products. First we look at the definition of excretion. We then look at the waste products carbon dioxide, nitrogenous waste products including urea and bile pigments.
Image credits:
Tiger
https://commons.wikimedia.org/wiki/File:Siberischer_tiger_de.jpg
S. Taheri, CC BY-SA 2.5 https://creativecommons.org/licenses/by-sa/2.5, via Wikimedia Commons
Fish
https://commons.wikimedia.org/wiki/File:Vieja_melanura Karlsruhe_Zoo_01.jpg
H. Zell, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Bird
https://commons.wikimedia.org/wiki/File:Female_house_sparrow_at_Kodai.jpg
Deepak Sundar, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Insect
https://commons.wikimedia.org/wiki/File:Sympetrum_sanguineum_qtl13.jpg
Quartl, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Red blood cells
https://commons.wikimedia.org/wiki/File:Blood-rbcs_and_thrombocytes2.jpg
Echinaceapallida, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Liver animation
https://commons.wikimedia.org/wiki/File:Liver_01_animation2.gif
Polygon data is generated by Database Center for Life Science(DBCLS)[2], CC BY-SA 2.1 JP https://creativecommons.org/licenses/by-sa/2.1/jp/deed.en, via Wikimedia Commons A Level Biology Revision (Year 13) Excretion and Waste Products](https://i.ytimg.com/vi/iYtgn7dwGW0/mqdefault.jpg)









![GCSE Biology Revision Animal Cells
Find your 9s with PLUS. Click the link to try for free https://www.freesciencelessons.co.uk/modules/gcse-biology-1-triple/
Teachers, to get PLUS for your school, email schools@freesciencelessons.co.uk
In this video, we explore the structure of animal cells. I take you through the key structures and their functions and then give you a cell to label yourself.
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Biology. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
Image credits:
HeLa cell By TenOfAllTrades at English Wikipedia - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1583880
Fluorescent mitochondria By 8x57is - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=44771036
Mitochondria https://commons.wikimedia.org/wiki/File:Mitochondria,_mammalian_lung TEM_(2).jpg
By Louisa Howard [Public domain], via Wikimedia Commons
Cheek cells
https://commons.wikimedia.org/wiki/File:Cheekcells_stained.jpg
Mulletsrokk, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons GCSE Biology Revision Animal Cells](https://i.ytimg.com/vi/mZLSJOVI4l8/mqdefault.jpg)