anyone else finding C3 chemistry difficult?
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: anyone else finding C3 chemistry difficult?I've got a few for the metals that form a coloured precipitate for NaOH...(Original post by Zigggyy.)
All the tests and stuff
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Calcium: White (Calcium is in milk, milk is white)
Copper II: Blue (I just found it easier to remember this one, copper is always blue
)
Iron II: Sludgy green (the grass is green at 2 o'clock)
Iron III: Reddish brown (the grass goes reddish brown at 3 o'clock
)
Aluminium: White at first, then redissolves in excess NaOH to form a colourless solution ('Aluminum' reminds me of a Harry Potter spell, and it's 'magical' because it redissolves in excess to go from white to colourless, haha)
Magnesium: White (like the inside of a Magnum ice-cream
)
HALIDES
- Add nitric acid
- Add silver nitrate solution
Chloride gives white precipitate of Silver Chloride (t-shirt is white after getting washed)
Bromide gives cream precipitate of Silver Bromide (t-shirt is cream after being worn once)
Iodide gives yellow precipitate of Silver Iodide (t-shirt is yellow after being worn again)
Nothing too fabulous, but it's how I remember it. Hope this helped a little, good luck! -
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Ahahaha I love the magnum white one especially :')(Original post by Swords N Thorns)
I've got a few for the metals that form a coloured precipitate for NaOH...
Calcium: White (Calcium is in milk, milk is white)
Copper II: Blue (I just found it easier to remember this one, copper is always blue)
Iron II: Sludgy green (the grass is green at 2 o'clock)
Iron III: Reddish brown (the grass goes reddish brown at 3 o'clock)
Aluminium: White at first, then redissolves in excess NaOH to form a colourless solution ('Aluminum' reminds me of a Harry Potter spell, and it's 'magical' because it redissolves in excess to go from white to colourless, haha)
Magnesium: White (like the inside of a Magnum ice-cream)
HALIDES
- Add nitric acid
- Add silver nitrate solution
Chloride gives white precipitate of Silver Chloride (t-shirt is white after getting washed)
Bromide gives cream precipitate of Silver Bromide (t-shirt is cream after being worn once)
Iodide gives yellow precipitate of Silver Iodide (t-shirt is yellow after being worn again)
Nothing too fabulous, but it's how I remember it. Hope this helped a little, good luck!
That's so good, thank you! :')
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Re: anyone else finding C3 chemistry difficult?Okay, the first shell fills up like normal, it contains 2 electrons.(Original post by letsbehonest)
SOMEONE HELP ME - EXPLAIN WHAT HAPPENS IN 3RD AND 4TH ENERGY LEVEL IN TRANSITION METALS! i dont get it
Second shell always contains 8 electrons.
Then the third shell fills up. It contains 8 electrons.
Then the fourth shell fills up. It contains 2 electrons.
Once the fourth shell is full, more electrons start going into the third shell.
The third shell can hold up to 18 electrons.
e.g.
Potassium's electronic arrangement is 2,8,8,1
Calcium's electronic arrangement is 2,8,8,2
Once the fourth shell has 2 electrons in it, electrons start filling up the third shell.
So Scandium's electronic arrangement is 2,8,9,2.
Hope this helps a little!
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Re: anyone else finding C3 chemistry difficult?My friend is remembering the elements by 'Little small penises crave big milfs'. :P(Original post by Zigggyy.)
Ahaha, those are really good! :') -
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ahahahahahaha!(Original post by Cubic)
My friend is remembering the elements by 'Little small penises crave big milfs'. :P
How does that work? (':
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Re: anyone else finding C3 chemistry difficult?Pretty easy. I somehow managed to get the wrong answer for the bond energy calculation -.- oh wells, and i didn't write my working out for the mass question but I got 12g, hope I don't lose a mark for that. Also I don't know if saying they form alkali solutions is a property and I didn't even say in water :/ So, it's looking like I'm gonna get around 38-40.(Original post by PaliD)
How was the exam? Has anyone got/made the unofficial mark schemeee (: -
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Re: anyone else finding C3 chemistry difficult?I can't believe I never got the titration ones. I knew how to do them, suppose I just panicked.
Heh heh. I should get a mark on it for writing out equations and numerical substituations. Need 90 UMS. Here's hoping for a low A* boundary (32 will quite happily do) -
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Omg, same, I was so annoyed and I proper thought I got the right answer. That's still good, as long as it gets you your target grade. Physics tomorrow!(Original post by letsbehonest)
Pretty easy. I somehow managed to get the wrong answer for the bond energy calculation -.- oh wells, and i didn't write my working out for the mass question but I got 12g, hope I don't lose a mark for that. Also I don't know if saying they form alkali solutions is a property and I didn't even say in water :/ So, it's looking like I'm gonna get around 38-40.
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