Physics, Chemistry and Biology: Post your doubts here!

[Maz]

no because in 5 significant figure, the readings are inaccurate

Probably you saw this in the MS.
However, what readings?

 

[Tekno-M]

I did that same question and I don't seem to understand why 5 sig. figures is inaccurate, I thought more sig. figures, i.e. 5.4123212, is more accurate than less, i.e. 5.4.

 

[mahmouds]

no because in 5 significant figure, the readings are inaccurate

Why???

 

[Manobilly]

As the readings for distance and time are inaccurate,not rounded.

 

[Maz]

As the readings for distance and time are inaccurate,not rounded.

You know i still can't make any sense of it.

 

[Tekno-M]

You know i still can't make any sense of it.

Me neither.
One question for you, what's a set square ?

 

[Iridescent]

Me neither.
One question for you, what's a set square ?

the Triangle thingys in the geometry box are the set squares

 

[Tekno-M]

the Triangle thingys in the geometry box are the set squares

How to use them ?

 

[Iridescent]

How to use them ?

used for 90 degree angles i guess

 

[thats_me]

How to use them ?

This is how hope u get it..

 

[ATTAR96]

how to find gradient of a line using triangular method in p6 phys

 

[thats_me]

how to find gradient of a line using triangular method in p6 phys

Just take a value frm yaxis & one frm xaxis of the graph and extend them towards each other such that they form a triangle , Try doin it..

 

[Manobilly]

Hi, had a doubt in chemistry
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_33.pdf
question 5b (iv) Need a diagram to understand
question 7 b (ii) need diagram

 

[Manobilly]

thats_me Here is what you wanted ,sorry didnt knw how to send in convo ,will explain in the inbox.

 

[EpicLol]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w11_qp_61.pdf
Question 5 (d) plzz !!!!

no as the readings need to be more precise....

 

[EpicLol]

Hi, had a doubt in chemistry
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_33.pdf
question 5b (iv) Need a diagram to understand
question 7 b (ii) need diagram

I spent like 10 mins making a nice drawing
Hope it helps XD

For question 7 b ii

 

[EpicLol]

Could someone explain how bauxite(aluminium ore), hematite(iron ore) and like other ores that are needed for igcse? I dont understand how they are like purified and extracted....thx...

 

[M.Talha]

Chemistry : In 0620/31/ON/08 Question 6 b (ii) & (iii), Why there is no reaction when KOH decompose in heat? Why KNO3 - / > KO + NO2 + O2 (which is normal decomposition of nitrates)?

 

[kboss]

Chemistry : In 0620/31/ON/08 Question 6 b (ii) & (iii), Why there is no reaction when KOH decompose in heat? Why KNO3 - / > KO + NO2 + O2 (which is normal decomposition of nitrates)?

group one hydroxides do not decompose when heated...not sure why but its a rule just memorize it i guess

 

[Ritter]

could you tell me how to solve question 3)(c) in the november 2010 physics paper 61
link :- http://www.xtremepapers.me/CIE/Cambridge IGCSE/0625 - Physics/0625_w10_qp_61.pdf

also june 2011 question 1 (c)
link: http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s11_qp_61.pdf

thanks in advance.