This video from Frankly Chemistry contains practice exam questions.

This video from Frankly Chemistry contains practice exam questions.

This video from Frankly Chemistry contains practice exam questions.

This video from Frankly Chemistry contains practice exam questions.

This video from Frankly Chemistry contains practice exam questions.

This video from Frankly Chemistry contains practice exam questions.

This video from Frankly Chemistry contains practice exam questions.

This video from Frankly Chemistry contains practice exam question

This video from Frankly Chemistry contains practice exam questions.

Revise for GCSE Chemistry with this video from Frankly Chemistry.

In this video from Frankly Chemistry we look at covalent bonding in a ethene molecule.

In this video from Frankly Chemistry we learn about Confucius.

This video from Frankly Chemistry we look at the general chemistry of alpha amino acids, including their physical and chemical properties.

This video from Frankly Chemistry Ammonia solution is added slowly to the chloride salt solutions of these metals.

This video from Frankly Chemistry shows testing for the presence of -OH groups.

This video from Frankly Chemistry shows two questions about reacting masses.

This video from Frankly Chemistry shows how nitrogen and hydrogen atoms share electron pairs in forming a molecule of ammonia

This resource is designed to support the teaching of electronic configuration - illustrating the application of the aufbau rule, Hund’s rule and the First in First out rule. This is the summary provided at the end: Electrons repel one another but need to share the same space around the nucleus. Electrons are tiny compared with the size of the atom and they move at an enormously high speed (about 2,200 kilometers per second). Apart from Chromium and Copper, the atoms of the first 36 elements obey the aufbau rule and Hund’s rule. Energy levels 3 and 4 overlap and this means that electrons enter the 4s subshell before the 3d subshell. Chromium breaks the aufbau rule in order to half-fill its 3d subshell as this provides greater stability. Copper breaks the aufbau rule in order to fill its 3d subshell as this provides greater stability. When the transition metal atoms lose electrons to form cations the electrons come out of the 4s subshell first.

So-called Hess Cycles can be solved in at least 3 ways: There is the cycle method itself, but this is the slowest method and should only be used when specified. There is the formula method when you have information on either enthalpies of combustion or formation. Then there is the older out-dated algebraic method. This always works and works the quickest; but unfortunately it won’t be that clear how you carried it out. In this presentation I look at the use of these 3 methods to find the enthalpy of formation of ethanol. From education-catalogue.com

Heat & Distill (simple distillation) Heat & distill with 2-necked flask Heat under Reflux (reflux distillation) Reflux distillation & 2-necked flask Washing to remove acid impurities Vacuum filtration & m.p. determination Drying an organic liquid product Recrystallisation of organic solids Reduction with LiAlH4 & NaBH4 Steam distillation