Physics paper 31 , (a death call)

[IGCSE O/L student]

its 1.something.........i think its 1.15

that's right

 

[kim anika]

haroon740

i wish i got it before physic p3.....now its kinda useless

 

[kim anika]

that's right

yahoooooooooooooo

 

[IGCSE O/L student]

yahoooooooooooooo

LOL! calm down!

 

[areebaization]

I don't think so, areeba. because heat is not removed. you have to supply heat!

no because for evaporation energy is taken in not given out

But guys after evaporation heat is lost right? remember molecules with higher energy escape the surface...and leave behind molecules with lower energy(cooler)?

 

[Yousif Mukkhtar]

I think I wrote is a 1.15 m. We got it by the formula P.E=mgh, where P.E is equals to the Kinetic energy previously calculated right?

 

[Yousif Mukkhtar]

But guys after evaporation heat is lost right? remember molecules with higher energy escape the surface...and leave behind molecules with lower energy(cooler)?

Condensation is right, also freezing.

 

[IGCSE O/L student]

But guys after evaporation heat is lost right? remember molecules with higher energy escape the surface...and leave behind molecules with lower energy(cooler)?

but during the process of change of state, it takes in heat. this is what is asked.

 

[BurakBurak]

have a look http://en.wikipedia.org/wiki/Series_and_parallel_circuits
idk where you got the idea that voltage somehow magically divides in a parallel circuit
lol its aginst the simple rules of electronics

Dont forget that in series curcits the voltage divides. There was one more resistance after the resistances in parallel. You need to go and visit that site

 

[BurakBurak]

I think this is the ryt solution:

All of them are wrong man.

 

[Jisu]

I wrote diffraction because the waves at the right (I drew circular waves BTW) they reached P.

i drew HALF OF A SEMI CIRCLE
is it rite
i did this cuz it said to da right of sth...

 

[areebaization]

i drew HALF OF A SEMI CIRCLE
is it rite
i did this cuz it said to da right of sth...

i meant "circular" waves and yeah that WAS semi circle and that's what i drew

 

[mohammad Shahzar]

the paper was tough! and guys dont discuss! it will make you feel worse.. :/

 

[Muhammad Nihal]

LOLL we have already discussed whole of the Paper

 

[Manobilly]

defraction.

 

[Jisu]

i meant "circular" waves and yeah that WAS semi circle and that's what i drew

u dont get me
i drew half of a semi circle as in a quarter of a circle to the right side

 

[svenas]

that's right

Hi....I've a question in this http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s11_qp_31.pdf
q6 ai ......plz tell me the steps here.
Thanks in advance

 

[bluefa1con]

But guys after evaporation heat is lost right? remember molecules with higher energy escape the surface...and leave behind molecules with lower energy(cooler)?

in evaporation heat is lost from the liquid but the particles that actually changed state have absorbed energy

 

[IGCSE O/L student]

Hi....I've a question in this http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s11_qp_31.pdf
q6 ai ......plz tell me the steps here.
Thanks in advance

this can be done by hydrating butene.
the conditions required are:
60atm
300 degrees celsius
and phosphoric acid as a catalyst

 

[svenas]

this can be done by hydrating butene.
the conditions required are:
60atm
300 degrees celsius
and phosphoric acid as a catalyst

yea but how to change petroleum to butane and butane to butene?