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this tripped me up too - the mass of the wires is negligible, not the mass of the rods

For question 20 - if C is correct, wouldn’t that also imply that B is correct? Also, despite the fact that Z is travelling faster than X from an external frame of reference, from the inertial frame of reference of X, Z appears to be stationary. Wouldn’t this mean X and Z tick at the same speed...

The reason that a Keq value of 0.53 is incorrect is due to the fact that you can’t do 0.1 - [BrCH2COOH](aq) to calculate [BrCH2COOH](octanol). This is because of the keyword “an AQUEOUS solution of 0.1M bromoacetic acid is shaken with an equal volume of octan-1-ol. This means that the...

no chance

this is what I got too

fairly certain the last question is 0.39 - if you got 0.53 I think you forgot to subtract the [BrCH2COOH](octan-1-ol) from your value of [BrCH2COOH](aq) in the Ka expression

4.92