# AQA A Level chemistry - Plancks ConstantWatch

#1
Do we need to memorize Planck's constant for our exams or will it be given to us like R=8.31 is given to us
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6 days ago
#2
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#3
how do I do that
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5 days ago
#4
you dont need to memorize it. They will give it to you in the question.
Theres only two types of questions they can ask you using delta E=hv.

The first being a standard calculation - remember the units for v can be /s or Hz.
The second being describe what each term means - delta E = energy change/difference between split orbitals. h = plancks constant and v = frequency of light absorbed..

They can also say, using your knowledge of this equation, explain why transition metals are coloured. This is always three marks saying 1. energy is absorbed from visible light to excite electrons. 2. from the d orbital to higher energy levels. 3. light that is reflected/transmitted/not absorbed can be seen :. the TM is coloured.

If you have anymore questions let me know
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#5
(Original post by AlevelMBC)
you dont need to memorize it. They will give it to you in the question.
Theres only two types of questions they can ask you using delta E=hv.

The first being a standard calculation - remember the units for v can be /s or Hz.
The second being describe what each term means - delta E = energy change/difference between split orbitals. h = plancks constant and v = frequency of light absorbed..

They can also say, using your knowledge of this equation, explain why transition metals are coloured. This is always three marks saying 1. energy is absorbed from visible light to excite electrons. 2. from the d orbital to higher energy levels. 3. light that is reflected/transmitted/not absorbed can be seen :. the TM is coloured.

If you have anymore questions let me know
WOW this is verrry helpful tyvm are you an a level student?
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5 days ago
#6
(Original post by Mo Haf)
WOW this is verrry helpful tyvm are you an a level student?
yup. wbu
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#7
(Original post by AlevelMBC)
yup. wbu
yep I am, you sound very knowledgeable on the subject and exam questions. how did you manage to get this good if you don't mind me asking
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5 days ago
#8
practice papers. a lot of them. YOu ask me about any topic and ill be able to give you what they tend to ask
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#9
how many are we talking?
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5 days ago
#10
enough
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#11
so I was wondering, how do you know how many sig figs to answer to? is it the lowest used in the question or the highest?
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4 days ago
#12
depends which question.
If you're calculating ph, always do it to 2 decimal places.
For any other one, i tend to just go for whatever they have used in the question (usually 3 sig figs).
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#13
but sometimes they use 3&2 sig figs in the question which one would you go for in this case?
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4 days ago
#14
then 3
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#15
ahh thank you, it's just cus I've always been told to do the lowest SF in questions
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#16
Hey man, sorry to bother you again but i made a post which got no replies but i thought you'd be the best person to ask anyway.
i was wondering if you'd be able to tell me which practicals, in the past 2 years, have been examined so we can get a better idea of which practicals are most likely to come up?
Many thanks
(Original post by AlevelMBC)
then 3
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