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I would start of by deriving the energies; kinetic and total to be exact (which aren’t too difficult). Then you can derive Kepler’s third law by analysing \dfrac{2\pi r}{T} and equating it with orbital velocity (might’ve to derive that as well)

Chemistry was. Chemistry was more iirc but can’t really remember

Yeah lol :p

Hey guys, in preparation for the physics exam, I thought I’d start a question thread where we ask each other questions and take turns answering them as revision, since we also don’t have many materials for revision. I’ll start off with the question: Explain how the cosmic microwave background...

How are you feeling for physics?

Well reagents mean reactants, the by products are useless so they aren’t really used in the next step as reactants

That wasn’t me, I almost forgot. But yeah, I’d assume you’d have to mention by products since it asks to describe the process

Reagents and reactants are mostly used interchangeably, however, reactants more specifically are used up in the reaction

Thanks, you too (if you have any :p)

either oxidation with potassium dichromate, aldehyde shiuld change colour from orange to green when oxidised to an acid. After to confirm solid na2co3 can be dissolved producing bubble and u know the rest

Yeah think it was. I just remember i multiplied some number by 2, i think i got 1500

1500? cant rrally rmber

I’m sure it’ll be fine, max we could lose is 1 mark anyway. also if our other info is coherent enough it should be fine and we might mot lose a mark

Well you dont really need heat for NaOH, heat is usually for water but i may have been taught wrong

Don’t think nesa will be that picky. Also they only judge sig figs for certain questions, usually 1 or 2 in the whole exam mention penalty for incorrect sig figs

Damn this is so demoralising lmao, just watching my marks dissolve away. I feel my potential b6 has been washed away to hahaha. Is it just me or does everyone else also have a mini heart attack when smth is brought up?

Ik but yeah Ive seen GCSE and A Level tbooks mention it, hopefully its not required for hsc tho and i escape with it

Yea i cannot believe I frickin forgot reflux!!!!!!!!!!!!!! Screwed myself over my gosh!!!! i havent seen textbooks actually include reflux though for NaOH, you reckon they could penalise me?

OH CRAP I FORGOT REFLUX FOR NUCLEOPHILLIC SUBSTITUTION FAAAAAAAAA

You dont need conditions for NaOH right? At least thats what I was taught