WJEC CH1 Chemistry exam - 21/05/10 Watch

abhijitnair
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#61
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#61
(Original post by JosephRedfern)
What did you put for the SiH4 questoin? I got 48g, since the mr of one was half that of the other, and 96/2 = 48g
was that c?
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NcJns
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#62
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For the question "Describe and expalain the changes in rate using collision theory"

I wote firstly a description of how the rate initially increases rapidly and then stops at 0.65. I then said that when reacting partilces collide they must have the required activation energy, and the catalyst present lowers this activation energy. This means more particles collide with the required activation energy, and therefore this causes the rapid rise of the rate of reaction. The rate of reaction begins to slow down and stop at 0.65 because all of reactant A has been converted.

Do you think this is right?
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Rossshaw
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#63
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#63
(Original post by NcJns)
For the question "Describe and expalain the changes in rate using collision theory"

I wote firstly a description of how the rate initially increases rapidly and then stops at 0.65. I then said that when reacting partilces collide they must have the required activation energy, and the catalyst present lowers this activation energy. This means more particles collide with the required activation energy, and therefore this causes the rapid rise of the rate of reaction. The rate of reaction begins to slow down and stop at 0.65 because all of reactant A has been converted.

Do you think this is right?
I think it's about the concentration of reactant. More concentration of reactant = more particles per unit vol = faster rate.
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abhijitnair
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#64
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#64
(Original post by Rossshaw)
I think it's about the concentration of reactant. More concentration of reactant = more particles per unit vol = faster rate.
yea th's wt i thought!
an A then?
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planetconwy1
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#65
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#65
(Original post by x_Melissa_x)
In January, you needed:

A 56
B 50
C 44
D 38
E 33
hey where did you find this out? i worked it out to be 64/80 for an A. Also do you reckon that it will be similar for CH2?
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abhijitnair
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#66
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(Original post by planetconwy1)
hey where did you find this out? i worked it out to be 64/80 for an A. Also do you reckon that it will be similar for CH2?
on the examiner reports. u don't need 80% raw to get A
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