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sin will be zero for the middle maximum.

It's the answer to the torque question... Asked by somebody else... Must have quoted you by mistake. Sorry!

All you have to do is measure the distance and use the equation I=AM, I being image length (the thing you've measured), A being actual length and M the magnification. And you have to make sure that they're all in the same units.

Make sure you use the correct units. It doesn't necessarily have to be on the right or left side; it'll be on the side of the -CO2. For example, an ester will be like this: acid-CO2-alcohol, or alcohol-O2C-acid. The C of the CO2 will be part of the c. acid.

6 is done simply by using pV=nRT. Compound Z is an ester, so the answer can be either C or D. D shows an ester formed using propanoic acid and C shows an ester formed using hexanoic acid. Compound X has 6 Carbons.

I didn't read the question properly. The question asks which alcohol will give the largest number of alkenes when dehydrated. A, B, C & D can all be dehydrated, but some will give more alkenes than others. For example, A & D can give only one alkene, because the C of the COH is attached to only...

No, the Carbon attached to -OH group must be attached to a Carbon which is attached to a Hydrogen.

To compare the distances.

Argh, I apologise. This isn't the first time this has happened! Anyway: 6. The volume of O2 is more, so there must have been more moles of H2O2. More moles -> higher concentration. 25. If an alcohol is to be dehydrated, the C of the C-OH must be attached to a C attached to an H atom.

The centre of the screen is always a maximum because the path difference of the waves = o so they're exactly in phase.

Here's a way of doing it: s=u^2/2a. Assume that u = 300 and a = 50. s will then = 900. Increasing 300 by 20% will make it 360. If a stays the same, s = 1296. 1296/900=1.44.

11. Barium nitrate decomposes to BaO and the unreactive gas is N2. 24. Attacking group is OH- and leaving group is Br-. 28. When heated with hot, conc., acidified KMnO4, the C=C bonds will break and turn into C=O bonds. 31. Radius is the same always because number of outer electrons is the same...

1.2x=0.2x900.

Two H atoms are missing in your compound.

6. The answer is A because you see from the a/t graph that acceleration becomes constant at 1/2T. In B the acceleration becomes 0 at 1/2 T, in C the velocity is zero & in D there's increasing acceleration throughout. 25. The fundamental frequency is when lambda is 1/4. The first overtone will be...

22. Stress=F/A. F and A is given. E=stress/strain. strain=stress/E. 26. Use dsin90=nxlambda and multiply that times 2 (the other 90 degrees) and add 1 (the middle maximum).

Use v^2=u^2+2as. a=F/m. To find F, draw a free-body diagram on the 1 kg mass, and m will be 3 kg.

Not sure about 21 but 31: a polymer is many monomers, so you'll need much more than one mole of a monomer to get 1 polymer. With 1 mole of monomer, you'll get any number of polymers less than 1, e.g. 0.00001 moles.

18. Use P=Fv. 7. When there's air resistance, the horizontal component decreases to 0. The vertical becomes constant (terminal velocity). 9. Use a suvat equation.