Really want to know this too, I just said effervescence....
Having done all the past papers I can say that this type of question is quite common, and it's always 2 marks, 1 for stating there will be effervescence/fizzing and the other mark for stating that the metal/solid whatever dissolves
Having done all the past papers I can say that this type of question is quite common, and it's always 2 marks, 1 for stating there will be effervescence/fizzing and the other mark for stating that the metal/solid whatever dissolves
It's rarely two marks for an observation, I'm sure. Usually the second mark is for the reaction.
For the table in the first question, I got the whole table correct except for the relative mass of an electron, I stated it was negligible. Would I only get 1 mark for this or do you think they would accept negligible as an answer?
For the question about what you would see in the reaction between ZnCO3 and HCl would you get the mark if you only put fizzing and didn't mention about the solid dissolving?
No probably not because questions like this on previous papers required both observations for the mark :/
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)
i think last 2 are wrong cuz Br cannot displace Cl- ions and I2 cannot displace Br- ions due to electronegativity difference... so there will no reaction in last 2 test tubes...
looking on the all answers I'm dropping 11 marks for sure ... i wrote calcium carbonate for alkali that can neutralize acid soil cuz in book they mentioned that... i am not sure would it be right or wrong