Thank you AQA for not a single balancing equation or complex formula 🙏🙏🙏

An exothermic reaction is one which transfers energy to the surroundings. This is usually done by heating, which can be shown by a rise in temperature.

The best example of an exothermic reaction is burning fuels (or combustion). This gives out a lot of energy meaning it is very exothermic.

The two main types of exothermic reactions are Neutralisation (acid + alkali) and Oxidation Reactions.

Example of oxidation reaction: adding sodium to water releases energy, meaning it must be exothermic. The reaction releases energy as sodium fizzes and moves about the surface of the water as it is oxidised.

*everyday uses of exothermic reactions*

Some hand warmers use the exothermic oxidation of iron in the air (with a salt solution as a catalyst) in order to release energy.

Self-heating cans of hot chocolate and coffee also rely on exothermic reactions between chemicals in their bases.

Does anyone have experience of marking AQA GCSE Chemistry higher tier and is able to help with interpreting how to mark a surface area to volume ratio question?

I have a student who has calculated both the surface area and volume but written incorrect units for both but as the numerical values are correct has gone on to calculate the final numerical ratio answer correctly. The units for the SA and vol working marks both have units in brackets in the mark scheme. I know there is a ‘bracket rule’ that information in brackets is not required but contradictory information can lose the mark. So this would suggest you could lose both the first two method marks for SA and vol but get the remaining 2 marks out of 4. However I am reading in other places that if the final answer is correct then any incorrect units in the method can be ignored and full marks awarded as the units were not needed. There is also a sentence that states if full marks cannot be awarded if there are any method error but do incorrect units in the method count as an error if they are in brackets anyway? And I’ve also read somewhere that you can’t be penalised twice in the same question part for the same type of error, eg: units? So I guess I’m asking if this is 2, 3 or 4 marks out of a possible 4?? Hope that makes sense!! Thank you in advance

I’m due to start a-level chemistry in September but I haven’t done triple science GCSE. Does anyone know where I could find a topic list for the triple sciences so I can begin revising in preparation?

How do you do it? I was somehow taught with counters and did not understand. Also, how do the big numbers and subscript work and relate with the elements? How do you know what a compound is called just from symbols and how do you add them together and get the right answer in formulas? I’d appreciate ANY help pleaaaaaase!

Any1 have leaks or guessed papers please message i need leaks or guessed papers.

how is it an oxidation reaction (loss of electrons) if it happens at the negatice electrode?

AQA GCSE Chemistry Paper 1:

https://www.youtube.com/watch?v=S9N5ggtLY_c&list=PLNdd75j98fry3HcCVgkQf2kE4I1u3tLN9

AQA GCSE chemistry Paper 2:

https://www.youtube.com/watch?v=h9MZ38749cc&list=PLNdd75j98frz_ZpvMJzWIrHSHOyX6M8_m

GUYS I HAVE MY MOCK TOMORROW FOR CHEMISTRY AND I KNOW ITS GONNA BE 2025 I DO EDEXCEL DOES ANYONE KNOW ANY QUESTIONS PLEASSEEEEE

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Like a list of all general formulae just to memorize...

https://discord.gg/t6fBPrFX