As temperature increases so does the dissociation of water yes?
if this is so does water conduct electricity at higher temperatures?
it would have a larger amount of dissociated ions which would be the charge carriers just like the dissociated ions in dissolved substaces eg. NaCl
Wednesday, 19 May 2010
Monday, 22 March 2010
Sunday, 15 November 2009
Thursday, 10 September 2009
Welcome to all Year 12 chemists!
Welcome to our A-level Chemistry blog, now for all students studying AS and A2 Chemistry at Cedars!
You can find links to useful websites and resources to download on the right-hand side of the blog page. Also, you can all post comments and respond to other comments on the blog, so please make use of this to get help with things you don't understand, to check when homework is due in if you've forgotten(!) or simply to share your deep and meaningful ruminating about chemistry with the rest of us as and when it happens!
If you fancy checking your knowledge and understanding of chemistry from GCSE, have a go at the Royal Society of Chemistry online 'check-up' which you can find at: http://www.rsc.org/education/teachers/learnnet/olympiad_l6checkup.htm. Please use my school email address (L.Sudbery@cedarsupper.beds.sch.uk) when asked for a teacher's or school email address, then I get to see how you've got on! The deadline to complete this by is Sunday, 18th October so you've got plenty of time but it would be good if as many of you as possible had a go!)
Year 13.... Don't forget the RSC olympiad! (Link to website is on the previous post from 16th July.)
You can find links to useful websites and resources to download on the right-hand side of the blog page. Also, you can all post comments and respond to other comments on the blog, so please make use of this to get help with things you don't understand, to check when homework is due in if you've forgotten(!) or simply to share your deep and meaningful ruminating about chemistry with the rest of us as and when it happens!
If you fancy checking your knowledge and understanding of chemistry from GCSE, have a go at the Royal Society of Chemistry online 'check-up' which you can find at: http://www.rsc.org/education/teachers/learnnet/olympiad_l6checkup.htm. Please use my school email address (L.Sudbery@cedarsupper.beds.sch.uk) when asked for a teacher's or school email address, then I get to see how you've got on! The deadline to complete this by is Sunday, 18th October so you've got plenty of time but it would be good if as many of you as possible had a go!)
Year 13.... Don't forget the RSC olympiad! (Link to website is on the previous post from 16th July.)
Thursday, 16 July 2009
RSC Olympiad for Year 13 chemists
Here is the link to the Royal Society of Chemistry's olympiad website, as promised!
www.rsc.org/education/teachers/learnnet/olympiad_L6.htm
You will first need to register as a student. Please use my email address when prompted for your teacher's details. You can then download practice olympiad papers to give you an idea of what to expect in the real thing!
Have a really great summer..... and don't forget that piece of homework that's due in on the first day back in September!
www.rsc.org/education/teachers/learnnet/olympiad_L6.htm
You will first need to register as a student. Please use my email address when prompted for your teacher's details. You can then download practice olympiad papers to give you an idea of what to expect in the real thing!
Have a really great summer..... and don't forget that piece of homework that's due in on the first day back in September!
Wednesday, 27 May 2009
Mass Spectrometry and Infrared Spectroscopy
Do we need to know *how* they work. I looked on syllabus and as far as I could tell we do not need to know how we get the graphs, just how to use them, but wanted to make sure . .
Wednesday, 22 April 2009
What is evaporation?
If volatily is the ease with which a liquid turns into a gas, then does that mean all liquids evaporate? Is evaporation the state change from liquid to gas? Does this happen at below the boiling point (eg leaving some water at room temperature) because of the Boltzmann distribution, i.e. even at a temperature of 20 degrees celsius, some molecules have enough energy to turn into a gas, and eventually all molecules will leave the container in which the liquid is held?
Is it only liquids that do this (can sublimation be spontaneous, without a heat source?), and is there any point below which liquids do not evaporate, except melting point? Or does it just become so slow near the melting point that it can not be observed?
Also, when you're boiling a kettle, some of the water is turning into steam (a gas) which you can't see, immediately next to the spout, but what you can see is water vapour, a little further away from the spout, where the steam has hit the (relatively) cold air and condensed into water droplets, liquid suspended in air. Is this correct?
Is it only liquids that do this (can sublimation be spontaneous, without a heat source?), and is there any point below which liquids do not evaporate, except melting point? Or does it just become so slow near the melting point that it can not be observed?
Also, when you're boiling a kettle, some of the water is turning into steam (a gas) which you can't see, immediately next to the spout, but what you can see is water vapour, a little further away from the spout, where the steam has hit the (relatively) cold air and condensed into water droplets, liquid suspended in air. Is this correct?
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