F321 27th May 2016

But I thought the oxidation state of O was always -2 in a compound.

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But I thought the oxidation state of O was always -2 in a compound.

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There were 2 lone pairs on the oxygen atom so it's no-linear, bond angle 104.5 degrees. It can't be linear.

Well im pretty sure it was 180 same as CO2

Well im pretty sure it was 180 same as CO2

It says in the book that we wont meet the oxidation state of oxygen in oxygen fluorides,

How many marks might you lose do you reckon if you put 3 test tubes experiments rather than 2 for the 5 marker?

How many marks might you lose do you reckon if you put 3 test tubes experiments rather than 2 for the 5 marker?

Not sure why you posted sulfur difluoride, that didn't come up at all in the paper.

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Depends, did you use chlorine water? If so then at least 2

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That's how I answered:

Bromine water and calcium iodide - mixture turns purple
Bromine water and barium chloride - mixture turns orange
Iodine and barium chloride - mixture turns purple

Br2 (aq) + 2I- (aq) ---> 2Br- (aq) + I2(aq)

why would you do the last reaction? if you know bromine is more reactive than iodine and chlorine is more reactive than bromine. (Cl< Br< I ) with those two reaction you can determine the order

why would you do the last reaction? if you know bromine is more reactive than iodine and chlorine is more reactive than bromine. (Cl< Br< I ) with those two reaction you can determine the order