Science H/W!!
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04-12-2011, 07:57 PM
RE: Science H/W!!
(04-12-2011 03:49 PM)Lilith Pride Wrote:  I'd try Khan Academy. have you?

http://www.khanacademy.org/#chemistry

Usually these small lessons help in remembering things.

Holy shit. I've never heard of this site before. I am in love. Information at the touch of a mouse. This is insane. I love porn and nasty shit like that but I just don't understand how websites like this one aren't more popular. Why have I never heard of this site, me the sponge to interesting information, the searcher of prevalent helpful websites. HOW, this is an injustice to the internets. But it sure goes a long way to explaining why creationism is so popular.

"I think of myself as an intelligent, sensitive human being with the soul of a clown which always forces me to blow it at the most important moments." -Jim Morrison
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04-12-2011, 08:50 PM
RE: Science H/W!!
Ah, Khan Academy, the very best resource you can get.
Also try this: http://www.chemguide.co.uk/

Anyway...

Q1) In general, a metal can displace any of the metals which are lower in the reactivity series. As we can see, Fe is higher in the reactivity series than Cu, and thus is able to displace Cu from CuSO4, to give FeSO4 and Cu.

Q2) CuSO4 + Fe -> FeSO4 + Cu
We have your equation here. Let's assume we are using 10g of Fe. We find the number of moles of Fe, which is (Mass of solid/Mr), and we get 0.179 moles. As we see form the equation, 1 mole of Fe reacts with 1 mole of CuSO4 to give 1 mole of Cu and 1 mole of FeSO4. Thus, we should get 0.179 moles of Cu solid.
We then find the mass of Cu, which is (No. of moles x Mr), which gives us 11.4g of Cu. There will be an increase in mass, assuming the mass of the solution does not change throughout the reaction.

Q3) CuSO4 is blue in colour, Fe is silvery grey, FeSO4 is green in colour while Cu is pinkish red. So, you should see the colour of the solution change from blue to green. Another observation would be silvery grey solid turned pinkish red.

Hope this helps Smile Good luck for your future O Levels!

Welcome to science. You're gonna like it here - Phil Plait

Have you ever tried taking a comfort blanket away from a small child? - DLJ
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05-12-2011, 11:09 AM
RE: Science H/W!!
Robotworld if I ever get chemistry work that I'm unsure of I may end up asking for your help Big Grin
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05-12-2011, 11:13 AM
RE: Science H/W!!
(04-12-2011 07:57 PM)lucradis Wrote:  
(04-12-2011 03:49 PM)Lilith Pride Wrote:  I'd try Khan Academy. have you?

http://www.khanacademy.org/#chemistry

Usually these small lessons help in remembering things.

Holy shit. I've never heard of this site before. I am in love. Information at the touch of a mouse. This is insane. I love porn and nasty shit like that but I just don't understand how websites like this one aren't more popular. Why have I never heard of this site, me the sponge to interesting information, the searcher of prevalent helpful websites. HOW, this is an injustice to the internets. But it sure goes a long way to explaining why creationism is so popular.

For real, dude. Just think if they somehow could do these videos as porn? It would be the perfect site!

Thanks, Lilith, for sharing this. I'm with Lucradis, how have I not known of this before?

"All that is necessary for the triumph of Calvinism is that good Atheists do nothing." ~Eric Oh My
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05-12-2011, 12:13 PM (This post was last modified: 05-12-2011 12:25 PM by tazmin98.)
RE: Science H/W!!
(04-12-2011 03:34 PM)FSM_scot Wrote:  i found this on wiki answers for Q1 "the reactivity series lists elements in order from most reactive to least reactive. in a displacement reaction, a more reactive element will "displace" a less reactive element in a compound, the reactivity series can therefore be used to determine which displacement reactions are possible."
(no idea if this helps i dont need to learn this stuff at college)

Q3 im not sure what you mean by that. When you say metals and non metals, after the reaction copper is the metal and the iron is in a compound with the sulphate so i dont think you can class it as either. If you mean the bonding in both the CuSO4 and the FeSO4 it would be ionic bonding as its between a metal and nonmetals.

Can you elaborate what you mean by that?

What I meant was to describe what happens to the appearance and properties of the material(I guess it's the iron)
Urggh! Don't worry about it. Sometime the chemistry teacher doesn't describe as well as the biology teacher.(I have two science teachers)
(04-12-2011 03:46 PM)GirlyMan Wrote:  Goddam Tazmin, what kinda school you in at the ripe old age of 13? Oxford? Cambridge? Sheffield?

No wonder you're an atheist at such a young age. Religion had no prayer against you.

And no I can't help you with your chemistry because I tried it 3 times and dropped out each time muttering "This ain't science, this is just fucking magic and I can't understand the incantations."

Fulwood Academy in Preston. It's new.
(04-12-2011 03:49 PM)Lilith Pride Wrote:  I'd try Khan Academy. have you?

http://www.khanacademy.org/#chemistry

Usually these small lessons help in remembering things.

Thanks!!Big Grin

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05-12-2011, 12:53 PM
RE: Science H/W!!
(05-12-2011 12:13 PM)tazmin98 Wrote:  Sometime the chemistry teacher doesn't describe as well as the biology teacher.(I have two science teachers)

Biology, now thats a subject i can help you with.
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05-12-2011, 02:33 PM
RE: Science H/W!!
Wish I could help. Chemistry is not my forte. Let me know if you have English, history, or physics homework.

“Whenever you find yourself on the side of the majority, it's time to pause and reflect.”

-Mark Twain
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05-12-2011, 03:49 PM
RE: Science H/W!!
Khan Academy was brought up here about 6 months ago by I'm not sure who. It's really a great tool.

I'm not a non believer, I believe in the possibility of anything. I just don't let the actuality of something be determined by a 3rd party.
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27-10-2012, 09:09 AM
RE: Science H/W!!
im having trouble on the same stuff at my school. No
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