GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam Discussion
Chemistry exam discussion - share revision tips in preparation for GCSE, A Level and other chemistry exams and discuss how they went afterwards.
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam DiscussionI think it is because it contains more H+ ions. Someone please correct me if this is not true.(Original post by elkana)
could someone please explain to me why one acid could be stronger then another
thank you
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam Discussionan acid is stronger if it fully ionises.(Original post by elkana)
could someone please explain to me why one acid could be stronger then another
thank you
weak acids only ionise less than 3%
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam DiscussionHello! Welcome to TSR. You joined at the right time I see; before exams!(Original post by resmith)
Im brand new to the student room so if i do anything wrong I'm sorry. Im really stuck on transition metals, please can someone help. Im seriously panicking!
thanks
What do you want to know?
Transition metals:
- High melting and boiling points
- Strong and hard
- Good conductors of heat and electricity
- Do NOT react vigorously with oxygen or water
- Form coloured compounds.
- Free electrons in highest energy level enable it to carry a charge
Last edited by 21stcenturyphantom; 23-05-2012 at 17:43. -
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam DiscussionIn terms of "why" I can explain by PM but it is very complicated.. you need to know all transition metals have 2 outer shell electrons (not strictly true but it will do for GCSE) - This makes them similar.(Original post by resmith)
Im brand new to the student room so if i do anything wrong I'm sorry. Im really stuck on transition metals, please can someone help. Im seriously panicking!
thanks
They have High MPs and BPs and they are hard and strong -
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam Discussion(Original post by 21stcenturyphantom)
Hello! Welcome to TSR. You joined at the right time I see; before exams!
What do you want to know?
Transition metals:
- High melting and boiling points
- Strong and hard
- Good conductors of heat and electricity
- Do NOT react vigorously with oxygen or water
- Form coloured compounds.
- Free electrons in highest energy level enable it to carry a charge
haha thanks.
Thats really useful thank you. also I'm stuck on why they have similar properties in terms of electronic structure.
thank you
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam DiscussionIts their electronic structure that is confusing me :/(Original post by steviep14)
In terms of "why" I can explain by PM but it is very complicated.. you need to know all transition metals have 2 outer shell electrons (not strictly true but it will do for GCSE) - This makes them similar.
They have High MPs and BPs and they are hard and strong -
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam Discussionand this is the complicated part..(Original post by resmith)
haha thanks.
Thats really useful thank you. also I'm stuck on why they have similar properties in terms of electronic structure.
thank you
For reasons I won't explain.. they are similar because they have 2 outer shell electrons - and that is just that
It is all to do with sub shells and energy levels blah blah..
Just knowing what is good enough at this stage
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam DiscussionThakyou so much(Original post by steviep14)
and this is the complicated part..
For reasons I won't explain.. they are similar because they have 2 outer shell electrons - and that is just that It is all to do with sub shells and energy levels blah blah..
Just knowing what is good enough at this stage
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam DiscussionIt is the electrons of the highest energy level that dictate their properties. As an example, Sodium is extremely reactive because it has only one electron in its highest energy level/shell/orbital. This means it wants to LOSE it in order to gain the stable electron arrangement of a noble gas. The same is true for group 7 elements. They react to fill up their highest energy level so they have a stable arrangement.(Original post by resmith)
I'm stuck on why they have similar properties in terms of electronic structure.
thank you
From the information I have for the GCSE syllabus I am studying, transition metals do not do this. It is the free electron in the highest energy level that acts as a 'sea of delocaised electrons' which means it can carry a charge. In terms of why this happens, I am afraid it is not in my syllabus. I'm interested to know why, but I'm not willing to look outside of the syllabus so close to exam time.
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam Discussionhttp://www.google.co.uk/url?sa=t&rct...3w9CC076bZ19tQ(Original post by Revision-)
anyone got JAn 2012 paper? -
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam Discussionin terms of its atomic structure how does that work?(Original post by resmith)
an acid is stronger if it fully ionises.
weak acids only ionise less than 3%
hope that helped -
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Re: GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam Discussionhttp://etcscience.wikispaces.com/fil...H-QP-Jan12.pdf(Original post by Revision-)
I repeat C3 PAPER JAN 2012?
It is all to do with sub shells and energy levels blah blah..
