• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

If you have any question on chem p6 im ready you guys. Don't Worry!!

Messages
111
Reaction score
27
Points
28
Hi.

when in a question they use a measuring cylinder and then later on they ask you how to make the experiment more accurate you say use a burette instead of a measuring cylinder because it is more accurate. I dont think theres a defined range of volumes, u dont need to know that
(pipette holds exactly 25cm cubed)


i did one question now and the question was

Name the piece of apparatus used to measure 25 cm `3 of nitric acid

the answer was measuring cylinder ........ not pipette
 
Messages
323
Reaction score
95
Points
28
JimmyCarter cn u plz explain q#5 p6 may june 2006

Alright, so(all the tests are made on the zinc containing substance since it dissolves in water and they are testin gon the filterate), it contains zinc, therefore when you add NaOHaq to zinc you get a white precipitate that dissolves in excess. Also, when ammonia is added to zinc, a white precipitate forms that is soluble in excess. and when you add barium nitrate a white ppt forms this indicates the presence of a sulfate ion because barium sulfate is a white insolube ppt. test iv shows that it contains no halogens.
Tests on the residue means on the part that doesnt dissolve and tests indicate that the gas produced was CO2 so the ion must have been a carbonate.
the first test a) indicates that it is hydrated since it produced water vapor
this will help you alot http://library.thinkquest.org/2923/tests.html
 
Messages
2,211
Reaction score
1,261
Points
173
Alright, so(all the tests are made on the zinc containing substance since it dissolves in water and they are testin gon the filterate), it contains zinc, therefore when you add NaOHaq to zinc you get a white precipitate that dissolves in excess. Also, when ammonia is added to zinc, a white precipitate forms that is soluble in excess. and when you add barium nitrate a white ppt forms this indicates the presence of a sulfate ion because barium sulfate is a white insolube ppt. test iv shows that it contains no halogens.
Tests on the residue means on the part that doesnt dissolve and tests indicate that the gas produced was CO2 so the ion must have been a carbonate.
the first test a) indicates that it is hydrated since it produced water vapor
this will help you alot http://library.thinkquest.org/2923/tests.html


thnx a loooooooot! :)
 
Messages
373
Reaction score
125
Points
53
There is no organic Chemistry.

By the way guys, can anyone explain to me the test for hydrogen? Do we just say pops with a lighted splint?
 
Messages
323
Reaction score
95
Points
28
There is no organic Chemistry.

By the way guys, can anyone explain to me the test for hydrogen? Do we just say pops with a lighted splint?
when you expose hydrogen to a lighted splint it burns with a squeaky pop. Thats it. your not required to know more :)
 
Messages
323
Reaction score
95
Points
28
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_S08_qp_6.pdf
q4 E first part it ask which volume of potassium manganate was used the greatest and it said that the solution already had 25cm3 of salt and it became 26 so only 1 cm was added ! :S but it say that the volume added 26 in the mark scheme :S help plz
the 25cm3 is for the salt but they asked for potassium manganate. what you do is that you compare the difference of the two experiments that you should have entered in the table and the greatest difference means that it used the greatest volume. understand?
C:\Users\sdfgh'\Desktop\Untitled.png
 
Messages
323
Reaction score
95
Points
28
whts the test 4 sodium nitrate solution?
well thats a pretty complicated one, but ok. So you can do a flame test an orange/yellow flame is made this indicates the presence of Sodium. then add NaOH and aluminum powder and heat, a gas that has a pungent smell and turns indicator paper blue (ammonia) proves the presence of Nitrates :)
 
Messages
56
Reaction score
9
Points
8
well thats a pretty complicated one, but ok. So you can do a flame test an orange/yellow flame is made this indicates the presence of Sodium. then add NaOH and aluminum powder and heat, a gas that has a pungent smell and turns indicator paper blue (ammonia) proves the presence of Nitrates :)
0_O.... thx
 
Top