Physics, Chemistry and Biology: Post your doubts here!

[smart_boy]

1 st ans cannot be D coz 3 organisums eaten do not stay in d 4th organism always they come out in wates,i e , the whole organism is not edible......
Ans is A coz mass is num*dry mass and as one knows tress have the max dry mass.....the ans should be A

Okay... Thanks..

 

[french410]

i have these questions:
1) what problem could u oversee if u were asked to test a carrot for the presence of reducing sugar and how could u overcome it?
2) why is it better to use water bath than flame when heating test tubes containing glucose.

 

[Kareem Gamal Omar]

In electrolysis what is the equation in the cathode and anode of molten lead iodide and explain please

 

[Sam Ivashkov]

Hi guys. I've got a couple of questions in Physics (Electricity).
Q - When a road tanker pumps oil or petrol into a storage tank, the connecting pipe must be earthed. If it is not, it could become charged. A build up of charge would cause a spark which could make the fuel vapour explode.
i - Why is the rubber hose of a petrol pump made of conducting rubber?
ii -Why must the storage tank and road tanker also be earthed before the fuel is pumped into the storage tank?

Thanks.

 

[Vaidik Shah]

hey why in electrolysis of HCl, hydrogen bubbles seem to form almost instantaneously but chlorine gas seems to form after sum time?
Also could u tell me all gases in which the above is noticed

 

[am123]

Where can u find 2012 papers of chem,phy and bio?

 

[Vaidik Shah]

hi sam ivashkov answer to Q 1- so that any charge that is build up in the tank can be conducted away into earth
Q 2 So as to remove any chrge that had been formed before ( while the truck was moving etc)

 

[Vaidik Shah]

olevelsourceforge type this in google

 

[semsemhosam]

Where can u find 2012 papers of chem,phy and bio?

www.olevel.sourceforge.net/papers

 

[champ-student]

can anyone explain how to find vectors by the formulae nd scale drawing both................fast plzzzzz

 

[champ-student]

Which of the following is a renewable energy resource?
a. Natural gas
b. Wind
c. Nuclear fuel
d. Oil

 

[champ-student]

what is terminal velocity

 

[semsemhosam]

Which of the following is a renewable energy resource?
a. Natural gas
b. Wind
c. Nuclear fuel
d. Oil

wind

 

[semsemhosam]

what is terminal velocity

when an object is falling , first it's weight (gravity) is acting on it pulling it down , then the air resistance pulls it up until the upward force (caused by air resistance) is = to the downward force , so it falls with a constant speed .. which is terminal velocity

 

[Adil Shariff]

Chemistry (Qualitative Analysis)
Why is an acid added when identifying the anion part of a salt?

 

[diamondsky]

Chemistry (Qualitative Analysis)
Why is an acid added when identifying the anion part of a salt?

u see its actually not necessary to add an acid
the actual reason behind it is to form an insoluble precipitate of the anion
eg. a soluble salt of barium is added for sulfate ion testing because BaSO4 is insoluble
the only sensible reason to think of is that it acts as a catalyst

 

[Adil Shariff]

u see its actually not necessary to add an acid
the actual reason behind it is to form an insoluble precipitate of the anion
eg. a soluble salt of barium is added for sulfate ion testing because BaSO4 is insoluble
the only sensible reason to think of is that it acts as a catalyst

Thanks alot!!

 

[Adil Shariff]

BIOLOGY
Which one of the two processes is catalyzed by an enzyme?? Respiration or Photosynthesis, explain you answer...

 

[diamondsky]

BIOLOGY
Which one of the two processes is catalyzed by an enzyme?? Respiration or Photosynthesis, explain you answer...

i dont now if it is by an enzyme bt d answer must be photosynthesis
here light acts as a catalyst for d light reaction wich is breaking down of water molecules
chlorophyll may be an enzyme
for all i noe respiration is not d answer

 

[Saahil Parikh]

BIOLOGY
Which one of the two processes is catalyzed by an enzyme?? Respiration or Photosynthesis, explain you answer...

photosynthesis... where chlorophyll acts as a catalyst..