Quick AS revisionWatch this thread
can u tell me any key areas to look at for 2021 AS paper for edexcel chem and ocr A bio of u know any
Im not so sure about the OCR portion but the examiners love environment questions and mitochondria questions.
Chemistry has many repetitive questions. You will notice that many answers are almost similar in papers. Eg equilibrium questions
A question with a reaction in equilibrium is given. They usually as how a change in pressure/temp/concentration/catalyst will change the rate of reaction. These are the true scoring questions. Its very important you go through the recent marking schemes and understand what points will give you the marks. But please do not make the mistake of writing those same points in every similar question. This is because in chemistry and Bio as level they check how you logically present your answers.
Eg 2A + 2B = 3C the forward reaction is exothermic
this is an equilibrium reaction for eg
they tell you what will happen to the rate of reaction if temp is decreased>
Know the marking scheme may contain bullet points like
- temp dec
- favours exothermic side
- Equilibrium shifts to product C
- Rate of reaction increased
If you write it like this with barely any structure trust me they may give you 2 out of 4 marks.
Most people only structure their answers when they see * this star symbol next to a question. Trust me all answers should be structured properly.
The best answer would be
As the temperature increased the reactant molecules gain energy and collide more frequently and successfully. An decrease in temperature favours the exothermic side of the reaction. Therefore the equilibrium shifts towards the product. This increases the rate of reaction.
This is just an example. you will definitely produce a far better answer than i did.
Thank you so much really appreciate your help I am definitely gonna go through stuff I can get easy marks in and structure the answers .I did some content revision for bio like through revision guide and went through all the topics.This was like 2 weeks ago .But last week monday I sat a pre mock 2020 exam to see where i am .I got like 37 marks out of 70 .But I didnt revise anything day or two day before the exam to see where I lack knowledge.Now I am confused do i have content problem or past paper problem.I will go through content anyway to keep it fresh in mind.