-
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)
Search results
-
Biology P 34 ..here what i got ..
For anything .. cause as the water proportion increases, the concentration of solution decreases. -
Biology P 34 ..here what i got ..
There are two methods of serial dilution: First one is that you use dynamic sources, meaning for example initially you have 20 cm3 of 1% sucrose conc., then you want to reduce the concentration by half in each successive dilution. So what you do is that in the second beaker, you add 10 cm3 of... -
Chemistry: Post your doubts here!
Atomization converts the element in any state to its gaseous state. -
AS Chemistry Practical - Paper 34
Oxidation of Mn in MnO4- is +7 (x+(4*-2)=-1) And its oxidation number changes to Mn2+ Change is from +7 to +2 (change: 5) -- Second half equation, x+(4*-2)=-2 C is +6 in left side And (x+(2*-2)=0) so x is +4 on right side Change is from +6 to +4 (change: 2) -- Then cross multiply the changes... -
AS Chemistry Practical - Paper 34
It is an orange-brown gas. http://www.docbrown.info/page13/ChemicalTests/ChemicalTestsg.htm -
AS Chemistry Practical - Paper 34
Ufffff, please listen carefully once so no questions will arise (beat lol). The results you get show and increase in temperature (line goes towards up), and then suddenly they become constant (remains horizontal) or it will go down. If you look at the points, all the points horizontal at the end... -
Chemistry: Post your doubts here!
U don't post it here. It's in Examiner's Report, and please Google it. ( hint: 9701_S02_er.pdf) http://www.novapapers.com/images/PDF/CIE/A-LEVEL/chemistry/2002jun/9701_s02_er.pdf -
AS Chemistry Practical - Paper 34
It solely depends on what reaction happens, just record your values and plot them. -
AS Chemistry Practical - Paper 34
I guess a picture will say it all, just look: http://img.ctrlv.in.s3.amazonaws.com/img/519d426bc59ba.jpg -
AS Chemistry Practical - Paper 34
Btw my name is not martin, but you can call me Flake :D -
-
AS Chemistry Practical - Paper 34
Dear, whenever there's an indicator, it usually has 2 colors and once they tell u to add, it has a color, and once u reach the end point it's color changes. Simple common sense. No need of memorizing what colour. -
AS Chemistry Practical - Paper 34
Salt Analysis for: • Pb2+ (Lead): o White ppt. soluble in excess of NaOH, but insoluble in excess of NH3. o If you have a comparison between aluminium and lead, lead (II) ions are insoluble in dilute acids (add HCl to both solutions, ppt. remains the same if it’s Pb2+) o Look at the reactions of... -
AS Chemistry Practical - Paper 34
In alkaline: Orange In acid: Pink -
AS Chemistry Practical - Paper 34
When you make two straight lines, they go and go and go until they cross each other. That point when they cross each other, from that they will ask u to look up temperature, and volume. Just see what values it's pointing to. -
-
AS Chemistry Practical - Paper 34
You will be having two different temperature readings. One will be increasing, and one will either be decreasing or constant value. Then you make a line through these 2 group of data, and the intersecting point between the lines (extended) will tell u temp. change and vol. -
AS Chemistry Practical - Paper 34
I really hate the part that I have to fill the burette. Once in a mock exam, the container provided was big for funnel so what happened was that it spilled all over my station on FB solutions :D And once also it went into my conical flask so I had to remake it. -
-
AS Chemistry Practical - Paper 34
But be careful not to be fooled, NaBr can also react with H2SO4, producing NahSO4 and HBr, and the HBr again gets oxidized (reducing H2SO4), and producing SO2, and Br2 gas!! (Brown)