for chemistry unit 3 tomorrow.. do we have to know ALL of the tests and ALL of the colour results? :(

  • 0 votes

it seems like so much to remember, do i need to know it all?

Posted Wed 23rd May, 2012 @ 18:02 by Ruby

3 Answers

  • 1 vote

i dont think you need to know all of them, just the main ones(potassium, sodium,copper, soething else) and a few of the precipatates

Answered Wed 23rd May, 2012 @ 18:06 by Nathan
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it's best if you revise all of them, when I did mine they asked for quite a few tests and you just never know which ones will come up.

Answered Wed 23rd May, 2012 @ 18:34 by Nuha
Edited by Nuha on Wed 23rd May, 2012 @ 18:34
  • 0 votes

yep, revise all of them, they always come up. Precipitates as well. I've just created a quiz that has everything on the foundation tier on it including flame tests+precipitates.

If you want, try and make up a sentence out of the colours.

Flame tests:

Barium, apple green

Calcium, Brick-red

Lithium, red

Sodium, Yellow

Potassium, Lilac

Precipitates:

Al3+, Ca2+, Mg2+ - all white

Cu2+ - Blue

Fe2+ - Green

Fe3+ - Brown (rust)

just trying to help!

Answered Wed 23rd May, 2012 @ 18:47 by Matthew
Edited by Matthew on Wed 23rd May, 2012 @ 18:48