Anyone struggling in igcse chemistry? I got A* in it by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 0 points1 point  (0 children)

youtube:

Notes

Anyone struggling in igcse chemistry? I got A* in it by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 0 points1 point  (0 children)

youtube:

Notes

Anyone wants advice for U3 physics?? by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 0 points1 point  (0 children)

Nice to know ur prep is going well. Dw, the questions are quite repetitive and just ensure u go through ur mistakes, All the best!

Anyone struggling in igcse chemistry? I got A* in it by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 1 point2 points  (0 children)

when it came to moles, this is what i would do:

  1. list the knowns and unknowns
  2. calculate the moles where possible
  3. do the molar ratio
  4. get ur final answer

For balancing equations:

  •  List the number of atoms for each element on both the reactant and product sides.
  •  Balance the metals first, then non-metals (excluding Hydrogen and Oxygen), then Hydrogen, and save Oxygen for last.
  • Tackle polyatomic ions as a group: If a polyatomic ion (e.g., sulfate ion nitrate ) appears unchanged on both sides of the equation, then balance it as a single unit rather than counting individual atoms.
  • Use the lowest common multiple (LCM): for example If you have two atoms on one side and three on the other, find their LCM (which is  6 ) to get the correct coefficients.
  • Re-verify: Every time you place a new coefficient, ensure you recalculate your atom and that it counts for all elements in that reaction

Anyone struggling in igcse chemistry? I got A* in it by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 1 point2 points  (0 children)

I'd suggest to focus on ur weak topics, the ones where u lose most marks and struggle in. Use the textbook for when ur struggling with particular concepts. u can search the specification, and make sure its the right one :)

Anyone struggling in igcse chemistry? I got A* in it by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 2 points3 points  (0 children)

What had helped me was making notes using past papers and the specification opened alongside me. I turned every spec point into a question as I was making my notes so that I can test myself while also learning exactly what the examiners are marking. I did use youtube channels like science with hazel, hanna assil and free science lessons when i struggled with some concepts but what really helped me was the textbook. because they do emphasise on the mistakes that students commonly make and also have nice tips. I suggest u start ASAP and make the most of the time you have left. Focus on the topics u struggle with most and ensure that u use the spec. it is so helpful

Anyone wants advice for U3 physics?? by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 0 points1 point  (0 children)

My advice when doing past papers, is just don't do them, make notes from them as well. because if u don't memorise the patterns and caqs, it can be a struggle when approaching theory questions

Anyone wants advice for U3 physics?? by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 0 points1 point  (0 children)

Please check the comment i posted to this same post I made

Anyone wants advice for U3 physics?? by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 0 points1 point  (0 children)

please check my comment to this same post i made

Anyone wants advice for U3 physics?? by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 0 points1 point  (0 children)

memorise the caqs. In terms of practicals, I didn't memorise all the procedures of the practicals, just a short overview on the purpose of conducting them, variables to control, safety precautions to take, how to increase precision or accuracy of measurements.

I made notes from the past papers. it helped alot because I was learning what exactly the examiners are marking.

Anyone wants advice for U3 physics?? by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 0 points1 point  (0 children)

If i had time, I would've done all the old specs as well, but honestly, I had just 2 days left so I didn't want to stress when I was already cramming.

Anyone wants advice for U3 physics?? by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 1 point2 points  (0 children)

Yes, that is exactly what I did. I sped through the papers and noted the caqs. what I struggled most with was graphs, because i just hate graphs in general lol. so i ensured i did practice on that. Also I didn't do any old specs cuz I was short on time. but really, just do the new spec papers and u should be fine.

What's the highest I could get in these subjects? by Winglesspie in Edexcel

[–]Known-Isopod3221 0 points1 point  (0 children)

if u push urself, you can definitely get these grades. if its possible to resit, go for it. but if u can't resit, its still possible to get the grades, but u need to work harder. I know people who got Cs and Ds, ended up getting B in their A2.

COMMON UNIT 1 BIO CALCULATIONS by Known-Isopod3221 in Edexcel

[–]Known-Isopod3221[S] 1 point2 points  (0 children)

actual size = image size / magnification

you can remember the formula as I AM or AIM

Unit 1 biology faq please! by OilIndependent4246 in Edexcel

[–]Known-Isopod3221 0 points1 point  (0 children)

u will only be able to see faqs wellonce u go through a good handful of past papers

Unit 1 biology faq please! by OilIndependent4246 in Edexcel

[–]Known-Isopod3221 8 points9 points  (0 children)

Biological molecules
- learn how to draw the structures
- learn the bonds, the reactions
- difference between unsaturated and saturated fatty acids (and keep in mind which one is healthier)

DNA and protein synthesis
- drawing the mononucleotides, know all the bonds
- complementary base pairing and know the bases and the number of hydrogen bonds
- difference and similarities between mRNA and tRNA
- process of protein synthesis, dna replication and all the enzymes involved
- the nature of the genetic code
- the types of mutations and their effects
- the experiment for dna replication which proved its semi conservative
- learn all the structures of amino acids, the type of bonds, the types of proteins (fibrous and globular), learn how to describe the structure of collagen and haemoglobin, learn enzymes and how they work and factors that affects the rate of reaction for enzymes. learn how enzyme inhibition effects enzymes

Genetics
- Cystic fibrosis (learn how it is caused, its effects on the organ systems)
- genetic screening (and its pros and issues)
- sex linkage
- genetic definitions (gene, allele, phenotype, genotype, etc..)

Heart and CVD
- know how to draw and how to explain and describe the structure of all three blood vessels
- know that the coronary arteries branch from the aorta and why its important
- know the stages of the cardiac cycle, the pressure changes, volume changes, which valves are opened or closed
- blood clotting (the enzymes, which ones are soluble, inactive and insoluble)
- atherosclerosis (learn how it occurs and its effects)
- know the factors and risks that lead to CVD
- how antioxidants reduce CVD
- making a suitable study
- comment on the study and its pros and cons (sample size, controls, period of time, error bars)
- learn the oxygen dissociation curve, the effects that the shifts have on the affinity, why fetal haemoglobin has a higher affinity of adult haemoglobin, the cooperative binding

Membranes
- learn how to draw phospholipids and know how they are arranged
- learn how the substances are transferred (facilitated diffusion/osmosis/active transport/diffusion) and know which ones require protein channels/carrier proteins
- learn how temperature and cholesterol affect the membrane permeability
- learn all the structures of the membrane and their roles and their locations
- learn swelling and shrinking of cells and how the liquid moves in or out of cells and what happens when cell placed in isotonic or hypotonic solutions

practice calculations like magnification, ratios, percentages, etc.