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For Q27a why do they discuss other features that are not related to temperature and chemical composition. Talking about density and translational and rotational velocities seems to not answer the question.

Well I think radius and surface area are analogous to each other so ig if they accept one they will accept the other. Let's hope they do 🙏

Do you think I would get marks if I said that the two variables that impact luminosity are mass and surface area instead of mentioning temperature?

I messed up the 7 marker because I forgot it would also experience projectile motion like a dumbass and I also messed up the 2nd last 4 marker.

Gluons mediate the strong force. Photons mediate the electromagnetic force. EM waves interact through the electromagnetic force because they are themselves oscillating electric and magnetic fields perpendiclar to each other.

If they ask something about the big bang and hubble's discoveries imma close the paper and leave.

∆E=-(6.67x10^-11x1000x6.0x10^23)/(2x42000x10^3)-(-6.67x10^-11x1000x6x10^24)/(2x6800x10^3) =the answer in A cant be bothered seeing what it was

BOTHHH. ∆E=1/2Uf-1/2Ui =-GMm/2rf - (-GMm/2ri)

The initial value of r would be 6800km and the final value of r would be 42000km, you jusy multiply the denominator of the expression for U by 2 as the total energy of the satellite is given by E=1/2(U). Make sure to convert the values of r to meters

Using Ufinal-Uinital in this question would give you B instead of A.

This question is an example of using the total energy change (1/2 U) to find the amount of enegry needed to move a satellite to a higher orbit.

I don't think the formula is given in the formula sheet but it's the E=-GMm/2r formula for total energy. Just find the initial value of E using the initial orbital radius given and subtract it from the final value of E using the new orbital radius given.

Total energy way I think cause GPE way just tells you how much GPE it gained and doesn't account for the net decrease in kinetic energy of the satellite too.

Would we need to be able to explain the Zeeman effect if we had to state limitations of Bohr's model?

Nah I reckon 98 maybe. 🤔

Part (a) was finding Ka of dichloroacetic acid and part (b) was using gibbs energy and Ka values to explain the difference in strength of the acids

Yeah I got 0.046 and got like 1.3x10^4

It was the acetic acid and trichloroacetic acid question

Ohhhhh. I don't remember which letter I chose but it was the one where the + was on the first ion because that was what was detected

Dissociates into NH4+ which donates proton to water and there is B-L acid.