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Author Topic: Chemistry Help HERE ONLY !!  (Read 106279 times)

Offline crypsAnity

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Re: Chemistry Help HERE ONLY !!
« Reply #450 on: May 30, 2009, 01:53:09 pm »
hmmm i was going through it.. but then you see there was this equation number of moles = charge passed/ Faradays Constant .. eee and there are loads calculations on em,.. so yeah betetr learn it .. ts not much i guess.. what say?
« Last Edit: May 30, 2009, 01:54:42 pm by crypsanity »
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #451 on: May 30, 2009, 01:56:44 pm »
the very little physics that we have in chem is electrolysis and cells

don't bother with those heavy, befuddling calculations.......

By the way w8 textbook do u use??

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Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #452 on: May 30, 2009, 01:59:34 pm »
i have a question, it may sound retarded but i waanna know if ppl actually know the answer

wat is the pH of ammonia?
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Offline godfather93

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Re: Chemistry Help HERE ONLY !!
« Reply #453 on: May 30, 2009, 02:08:10 pm »
ph 10 - 12
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Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #454 on: May 30, 2009, 02:09:28 pm »
yeah its approximetley 10
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Offline godfather93

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Re: Chemistry Help HERE ONLY !!
« Reply #455 on: May 30, 2009, 02:12:47 pm »
ok, here's a question from me: how do you make soda lime glass? (no looking at the book! ;))
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Offline Kim

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Re: Chemistry Help HERE ONLY !!
« Reply #456 on: May 30, 2009, 02:14:01 pm »
hey guys wassup?
ok i hav a few questions
1-how does the structure of metal explain why it is malleable?

2-suggest an explanation why exposure  to atmospheric pollution changes basic lead (11)carbonate into lead(11)sulphate

3-ethanol can be made from starch.this can be broken down by enzymes to simple sugars with formulae of the type shown
ho-(box)-oh
what other method changes starch into simple sugar?
sum1 help me
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Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #457 on: May 30, 2009, 02:17:19 pm »
Quote from: godfather93 on May 30, 2009, 02:12:47 pm
ok, here's a question from me: how do you make soda lime glass? (no looking at the book! ;))

hahaha, wats soda lime glass, i know hot to make glass, but not soda lime glass!!!!!!!!!!!
for glass: add limestone, sand and soda (if thats wat u mean by soda lime glass) to a very hot furnace
the materials react together, and form a hot liquid, and then the liquid is removed and shaped into many different products
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #458 on: May 30, 2009, 02:19:24 pm »
Quote from: godfather93 on May 30, 2009, 02:12:47 pm
ok, here's a question from me: how do you make soda lime glass? (no looking at the book! ;))

take a glass and fill it with soda lime. it's refreshing
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Offline Kim

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Re: Chemistry Help HERE ONLY !!
« Reply #459 on: May 30, 2009, 02:20:46 pm »
Quote from: godfather93 on May 30, 2009, 02:12:47 pm
ok, here's a question from me: how do you make soda lime glass? (no looking at the book! ;))

haha dude i jus read your quote stop giviv me a heart attack i thought their was sumthin i havent studied and please sum1 answer my doubt!!!!!!!!!!!!!!!!!!!!
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After all is said and done, more is said than done.

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The early bird may get the worm, but the second mouse gets the cheese.

Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #460 on: May 30, 2009, 02:21:50 pm »
Quote from: kim on May 30, 2009, 02:14:01 pm
hey guys wassup?
ok i hav a few questions
1-how does the structure of metal explain why it is malleable?

2-suggest an explanation why exposure  to atmospheric pollution changes basic lead (11)carbonate into lead(11)sulphate

3-ethanol can be made from starch.this can be broken down by enzymes to simple sugars with formulae of the type shown
ho-(box)-oh
what other method changes starch into simple sugar?
sum1 help me

1) cuz when force is applied, the ion layers slip, but the delocalized electrons move into new positions preventing shattering
2)because atmospheric pollution may contain sulphuris acid( in acid rain) which reacts with the lead(II) carbonate forming
lead(II) sulphate + water + carbon dioxide
3)by acid hydrolysis ( boiling the starch with acid)
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Offline crypsAnity

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Re: Chemistry Help HERE ONLY !!
« Reply #461 on: May 30, 2009, 02:22:55 pm »
@ nid

Chemistry by Richard Harwood .. umm those typical books by cambridge??
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Offline crypsAnity

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Re: Chemistry Help HERE ONLY !!
« Reply #462 on: May 30, 2009, 02:24:21 pm »
yeah and ts k.. im not worrying much.. hehe i love chemmmm!! lol .. shouldnt say much .. may God help me revise well.. lol
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #463 on: May 30, 2009, 02:25:07 pm »
Quote from: kim on May 30, 2009, 02:14:01 pm
hey guys wassup?
ok i hav a few questions
1-how does the structure of metal explain why it is malleable?

2-suggest an explanation why exposure  to atmospheric pollution changes basic lead (11)carbonate into lead(11)sulphate

3-ethanol can be made from starch.this can be broken down by enzymes to simple sugars with formulae of the type shown
ho-(box)-oh
what other method changes starch into simple sugar?
sum1 help me


1.force between particles is strong but non-directional. The layers in the metal can slip and new bonds can form, which is why they r malleable.
2.i think it's a simple reaction between the two. sulphate displaces the carbonate
3.acid hydrolysis of starch
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Offline thukon

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Re: Chemistry Help HERE ONLY !!
« Reply #464 on: May 30, 2009, 02:32:26 pm »
@ nid. Thanks.

I have another question. It says simple sugars are shown by HO-[  ]-OH. So are they diols? And does this mean that all diols are simple sugars? Or does it mean that all simple sugars are diols?
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