hey guys i NEED UR HELP!! this is dead urgent

[aronno]

This involves looking at the concentration time graph/ after the equilibrium reaction has experienced a change.
I dont understand how to either say, whether the amount of "A" has increased of decreased. How do we know wether the amount has increased or decreased.
 
A + B <--> 3C +D etc.

I AM ALSO CONFUSED ABOUT volume and its effect on the amount.i.e if the Volume of the system was incresed. or a volume water was added. or diluted.

HOW DO WE DETERMINE WETHER THE AMOUNT HAS INCREASED OR DECREASED???   

[monokekie]

look at the line that represents the substance of your interest, if it drops, its concentration decreases, if it rises, its concentration increases (the vertical axis represents the concentration, ie, the amount of the substance that is present in a particular volume of the solution)

with regards to your query about how to determine whether the amount has increased or decreased. i suggest that you firstly understand le chatelier's principle(they should be available in your textbook regardless of which one you are using), then secondly, practise reading the graph ( ie, analysing what sort of change has been made to the mixture)


your question if is quite vague i can't explain specifically

ppl feel free to add more

[d0minicz]

Increasing volume = decrease pressure = move to side with more particles
for your example it would be forward
Decrease pressure = all concentrations drop initially
so the amount of C and D would increase as its a forward reaction?

[aronno]

what about the water dilution???

[d0minicz]

dilution decreases pressure and all concs. initally decrease