1. firstly protein's detection test is not bendict's test, its biuret test. procedure is 1% albumin + equal amount of dlute sodium hydroxide. Add 1% of copper sulphate solution drop by drop. observation is a violet coluration is formed.lindalinoo said:hey all .. thanks for the thread its helpfull
i have some questions with investigations
1. describe a food test which might show whether there is more protein to be found in the 'white' or in the 'yolk' of the egg.
i kno tht we test the presence of protein by benedect's solution and the result is violet color .. but the question is DESCRIBE .. so ... ??
another one is how to test for the presence of starch and reducing sugar in honey
one more is in paper 6 oct/nov 2008 page 7 question 2
lol sorry my questions are a lot but i appreciate ur help
i always get confused between biuret and benedict's test :S Allah yestorprincemaazthefinal said:1. firstly protein's detection test is not bendict's test, its biuret test. procedure is 1% albumin + equal amount of dlute sodium hydroxide. Add 1% of copper sulphate solution drop by drop. observation is a violet coluration is formed.
2. reducing sugar is detected through the benedict's test. procedure is warm a mixture of the sugar with some benedict's solution. observation will be solution turns from clear blue to cloudy green, to yellow and finally forms aan orange-red precipitate. starch is detected through the starch test. procedure is to boil starch, placa into test-tube. add a drop of iodine. observation will be a dark blue colourisation being formed.
3. (i) (a) blue (b) blue (c) blue-black
(ii) table 2.1 (a) conlusions reducing sugar/glucose present. (b) protein absent.
(iii) table 2.2 conclusions. (a) no reducing sugar. (b) protein present
(iv) chopping increases surface area?releases cell contents; dissolved in ethanol
water added to complete test; if water added to original ethanol goes milky.
i gave you the main poinnts. I think you can ellaborate it your self.
snowbrood said:can anyone tell me about some observations that we would see if we:
react sulphuric acid or nitic acid or hydrochloric acid or ethanoic acid or lemon juice with sodium carbonate or magnesium ribbon or copper(II)oxide
lindalinoo said:its in paper 6 oct/nov 2008 page 7 question 2 (a) and (b) only ..
hmmm should i write the whole question ?? :S
Cant find ur paper !soniashaikh said:how can we predict the volume of solution needed to react wth an other solution. there is one question in 2007 may june session papers 6 question no 4 part c
plz solve it?
snowbrood said:hey can u suggest me some books for atp of chemistry and physics... i get confused as to what to study for atp paper help me out