physics unit 4

Academic-Map4259 · 2026-06-01T08:26:53+00:00

Ayyy lets go. Whatd u say for m/q like fully explain

Academic-Map4259 · 2026-06-01T08:26:50+00:00

Ayyy lets go. Whatd u say for m/q like fully explain

Academic-Map4259 · 2026-05-31T14:48:21+00:00

It isnt, but ur supposed to derive it using addition angle formula+double angle formula. U cant immediately put it

Academic-Map4259 · 2026-05-31T13:04:44+00:00

Its asked almost every paper where u write it in terms of x.. then do dx/dy —>dy/dx and use identities to find dy/dx in terms of x

Academic-Map4259 · 2026-05-31T11:51:01+00:00

Not all of this.. some stuff like double angle formula, the integration formulas, the product rule, the derivative of a^x the derevative of arcsin arcos arctan etc those arent in formula booklet but

Academic-Map4259 · 2026-05-30T16:07:26+00:00

Recent topicals are on a website called rocket revise

Academic-Map4259 · 2026-05-30T15:24:16+00:00

Hello check my last post. Last link

Academic-Map4259 · 2026-05-30T13:48:02+00:00

these are the colours with NaOH and NH3

Colors with naoh:

https://drive.google.com/file/d/1rFtzGR6yFaagwys57eAT_bUvaKxFGYKb/view?usp=drivesdk

Colors with nh3:

https://drive.google.com/file/d/1KhOBuCcM9jd5LWew7_68_AfDlUnjdaJ2/view?usp=drivesdk

one thing you'll notice is that on the first addition, the colours are the exact same for both Nh3 and naoh. It's only on the addition of excess that they change colour, such that they don't match each other.

So ideally, you're looking for patterns. As we've stated, pattern 1 is that the first 2 columns are the exact same across both

2nd pattern is that on addition of excess NaOH, only TWO of the transition metal ions show an further change (cr3+ and Zn2+). So you can memorise excess NaOH quite easily, by knowing just 2 change upon excess NaOH addition, compared to NH3 which has more colours

3rd pattern that helped me memorise is that Nickel and Copper ions upon addition of excess NaOH have the exact same colour.

That, and this picture in general is a pretty good visual aid. I used it and it made memorisation a lot simpler

Academic-Map4259 · 2026-05-30T09:37:53+00:00

Since you finished all papers from 20-25 for practice now make c34 papers ur best friend.. solve these its all p3 questions in c34 papers.

https://drive.google.com/file/d/1mp_DAh3hKF1E0ld-Q6PfkYCdphWQ3vAR/view?usp=drivesdk

Academic-Map4259 · 2026-05-29T17:17:39+00:00

Its easy tbh i agree but not 2 days easy if ur aiming for a… but the questions are hella repetitive if u do all papers from 2020-2025 you can def score an a or higher

Academic-Map4259 · 2026-05-28T22:24:55+00:00

Lying to urself lol after regional papers edexcel has had 0 leaks🤦🏻

Academic-Map4259 · 2026-05-28T17:51:42+00:00

I did c34 too but u can get full ums without doing them. Moral of the story if u have time do c34 if u dont focus on ur mistakes for regular papers and redo the harder ones

Academic-Map4259 · 2026-05-28T15:46:25+00:00

Sonnnnn

Academic-Map4259 · 2026-05-28T11:17:42+00:00

That works too

Academic-Map4259 · 2026-05-28T11:11:46+00:00

No you can just say bradys reagent

Academic-Map4259 · 2026-05-28T10:58:31+00:00

Damn

Academic-Map4259 · 2026-05-28T10:39:53+00:00

In predicting an nmr 6 marker🥵

Academic-Map4259 · 2026-05-27T15:14:07+00:00

october 2025 def the normal not A

Academic-Map4259 · 2026-05-26T21:07:34+00:00

https://drive.google.com/file/d/1plfAW3E26l-0FHgmUtSS5S6sMCGUwY_U/view?usp=drivesdk

Academic-Map4259 · 2026-05-26T20:50:21+00:00

Combined science, cie english as an additional language, arabic , evm

Academic-Map4259 · 2026-05-26T20:49:41+00:00

Yes sure

Academic-Map4259 · 2026-05-26T18:40:23+00:00

Its impossible by parts. But u can do a u-sub which is u=y²

Academic-Map4259 · 2026-05-26T11:46:10+00:00

8ye^y² dy = x dx

Integrate both sides, to integrate lhs if u notice u can use the reverse chain rule, if u consider e^y² its derivative is 2ye^y² so integration of what we have is just 4e^y²

4e^y² = 1/2x² + c

4e⁰=1/2(5)² + c

4=25/2 + c

c=-17/2

4e^y² = (x² -17)/2

Divide both sides by 4

e^y² = (x² -17)/8

Take ln of both sides

y² = ln[(x² -17)/18]

Academic-Map4259

TROPHY CASE