CHEMISTRY PAPER 6 HELP-PLEASEE

[John Bennett]

Sorry for the capital letters guys but i have my chemistry alternative to practical (paper 6) tomorrow and i am stuck on this question. It is may/june 2014 question question 4 (gi and gii). I sat there for like half an hour and still dont understand the question. Please can someone explain it to me

 

[DangerXJeff]

Sorry for the capital letters guys but i have my chemistry alternative to practical (paper 6) tomorrow and i am stuck on this question. It is may/june 2014 question question 4 (gi and gii). I sat there for like half an hour and still dont understand the question. Please can someone explain it to me

what variant?

 

[DangerXJeff]

if its variant 1 then...
g (i) we have to subtract the value from experiment 2 from experiment one to get the volume of HCl used for substance S (only) as in experiment 1 all of substance S is used and half of T is used and in exp. 2 half of T is used as well so if we subtract the two reading we will get the answer.
g (ii) as experiment 2 uses only half of T so 2 multiply by reading from experiment 2 u will get the value of "full" T.
HOPE I HELPED
i have chemistry paper 6 tomorrow as well .. GOODLUCK

 

[John Bennett]

Thank you soo much for clearing that up. I saw the answers in the mark scheme but i was unsure why. Good luck on tomorrows exam by the way

 

[John Bennett]

Another question: This is just a general question; if it asks me a test for example sodium nitrate; how would i know the tests for it? Are there any good notes for tests on compounds like this? My teachers notes only have tests for ammonium, copper, iron 2 and 3 only.

 

[DangerXJeff]

Another question: This is just a general question; if it asks me a test for example sodium nitrate; how would i know the tests for it? Are there any good notes for tests on compounds like this? My teachers notes only have tests for ammonium, copper, iron 2 and 3 only.

i dont think they will ask for sodium nitrate test.. even though if they do the only way to find them is to get the test for sodium and nitrate separately

 

[John Bennett]

Thanks

 

[DangerXJeff]

Thanks

Anytime

 

[John Bennett]

In a previous chemistry paper 6 question, it said to compare the concentration of 2 substances. In the mark scheme they wrote about using indicators. I wrote that you can compare the temperature of the two by heating each one of them and seeing which one has a greater temperature because the higher the temperature, the higher the concentration. Can cambridge accept answers that are outside of the mark scheme?