cloud edwards
Member
anyone got the answers to the art of smart 2017 chem paper?
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chem paper answers (2 Viewers)
- Thread starter cloud edwards
- Start date
Dont have answers but do you have any specific questions?
cloud edwards
Member
Yep, 11 (think it's ammonium chloride), 14 (think it's c), 20 (absolutely no idea) 23 a and b,
THANX
11) For a basic salt remember we need a strong base and a weak acid to have reacted. Ammonium comes from ammonia (weak base) and chloride from HCl(strong acid), so in fact ammonium chloride would be an acidic salt.
The correct answer is A (pottasium hydroxide is a strong base (strong bases are from group 1 and 2) and citrate is from citric acid weak acid
The correct answer is A (pottasium hydroxide is a strong base (strong bases are from group 1 and 2) and citrate is from citric acid weak acid
23b)https://imgur.com/gallery/kzZ8q
Sorry for multiple posts had to use my phone for the picture ones
Sorry for multiple posts had to use my phone for the picture ones
cloud edwards
Member
No, THANK YOU, your'e a lifesaver!
cloud edwards
Member
i didn't know yr 12 will still have avogrado's law
Thank you =)
Yeah I thought it was a little bit strange, then again though I have seen questions with avogadro's number as one of the steps in the calculation
Snowflek
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Can you explain this again. Sorry, my maths is horrible. What do you convert the percentage into when you times it by 100 first? And then dividing it by 100?
cloud edwards
Member
ONE more question; 21 b) Explain the need for a xataylst in the dehydration of ehtanol. I got the catalyst to conc sulfuric acid but i don't know the speciifc need
cloud edwards
Member
all ican think of is catalysts lowers activation energy and speeds up reaction
Snowflek
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Conc sulfuric acid is a dehydrating agent, so it will remove the water from ethanol.
It's three marks so need to go into detail with stuff. I would define a catalyst. Explain why it speeds up reaction rate. Then state that in this reaction the catalyst acts a dehydrating agent. Lastly, linking back to benefits of using a catalyst as well such as saves money as you get a lower temperature needed due to more reactants being able to overcome the lower activation energy barrier.
oh the dividing bit is converting from percentage to decimal and the 100mL is from the v/v bit
its parts per million (so the first fraction establishes a ratio of ozone to air) and the multiplication bit says how many ozone molecules there are in a million molecules of air