AS Chemistry- helping each other out!
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Original post by Shadowfire123
thanks you too did you di june 2014 IAL paper
No I haven't
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why is the second electron affinity endothermic? :3
Original post by Shadowfire123
why did you multiply it by 2
Like I said earlier, it's plus or minus 0.5, so 2 numbers (-0.5 and +0.5) (it's given in the question as )
Original post by C0balt
ohh right
Original post by FluffyCherry
Like I said earlier, it's plus or minus 0.5, so 2 numbers (-0.5 and +0.5) (it's given in the question as )
ohh right thanks
Original post by Dinaa
why is the second electron affinity endothermic? :3
It's because the electron is added to an ion which is already negative therefore it must overcome the repulsion.
Original post by Dinaa
why is the second electron affinity endothermic? :3
Because you are adding an electron to an already negative ion, so they will repel each other, you need to supply energy to overcome the repulsive force.
Can covalent bonds have ionic character due to electro negativity difference
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Original post by Dinaa
why is the second electron affinity endothermic? :3
It is exothermic because electrons have to lose energy to occupy a lower energy orbital. 2nd electron affinity is always endothermic (positive) because the electron is added to an ion which is already negative therefore it must overcome the repulsion.
whose doing the normal edexcel paper not IAL
Original post by Dinaa
.
I said bring the tube lower and have the tube go directly into the tube.. idk and another point?
I said bring the tube lower and have the tube go directly into the tube.. idk and another point?
Have the test tube angled upwards slightly so the gas can rise through easily?
I still get confuses with ppm 😢
Omg how do you work out percentage error 😢
which way does the arrow point for formation and combustion and also to find enthalpy change
Original post by Dinaa
Omg how do you work out percentage error 😢
If its like +- 0.4, you do 0.4/the original value lets say like 50cm^3 of water. Then x100 to get the %age error
Original post by Dinaa
I still get confuses with ppm 😢
Original post by Dinaa
Omg how do you work out percentage error 😢
woow you should know this
Original post by jshep000
If its like +- 0.4, you do 0.4/the original value lets say like 50cm^3 of water. Then x100 to get the %age error
give another example please
Original post by Shadowfire123
which way does the arrow point for formation and combustion and also to find enthalpy change
But that's unit 2..
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Original post by Shadowfire123
give another example please
%age error = error/reading (x100)
So if error of 0.5cm^3, and you're measuring 20cm^3 of liquid. You do 0.5/20 (x100)
Original post by Anon_98
well no there is a question on this in unit 1
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