ok heres mine with justifications for those hard ones... ><
1A
2D
3C
4D
5B
6A
7B
8C
9A Cause resonance and coordinate bond plays no role in solubility and since dissolving in water is not a reaction so O3 being reactive is irrelevant and O3 is bent so clearly polar no matter what resonance
10C just remember the rules
11B ok this one i was not sure between B or D but i chose B as the question said bromine WATER which exists as HBr and BrOH so possible products would be bromopropanol or bromopropane.. and i chose 2- bromo be cause the hydrogen tends to go on the carbon with the most hydrogen which is C1 so Br would be on c2 If the question says bromine LIQUID then it would be D. But since A and B are both possible B is just more likely to occur than A then that would make both A and B the right answer which we know is not possible... so that was why i was not sure of B or D ... If you guys have any thoughts please add...
12D ok the term electrochemical activity... is weird but i would interpret it as the reactivity of the metal? the potential to be oxidised? which mean we must inverset the sign and rank it??? .. anyways i dont think this question is legit...
13C logically thinking about C would show that it is true while everything else is just rubbish ... also for those who chose D .. addition of KCl into solution will release Cl- which favours forward reaction hence will be more blue... so C
14C Ok the thing as 3 carbons so no branching possible so no methyl... so the isomers would only differ in the position of the Br and Cl atom... the possible combinations are 1Br-1Cl, 2Br-2Cl, 1Br-2Cl, 1Cl-2Br, 1Br-3Cl so 5.. noting that any combinations of 3-3 2-3 would result in the same molecule.
15A weak acids ionise completely when excess base are added.. so behave identically to a strong acid and require same amount of base to neutralise
16B the Salt produced when a weak acid vs strong base is basic hence pH>7 while salts of strong acids vs strong bases are neutral
17D use 108/2800 for number of moles combusted then multiply by molar mas of C5H12O u get 3.9999... rounds to 3.40 D
18A ok so by NaX the base is capable of accepting 1 proton so mol of HCL used= Mole of NaX in 20Ml then x5 for Mole in 100ml= 0.0122 hence 0.0122 moles of Nax weighs 1 gram then molecular mass = 1/0.0122 = 82.0g
19B this is easy? just mass>mole>volume
20B easy.. mass to mole to mass..