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How was it? - HSN forum - Page 11

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How was it?


614 replies to this topic

#201 bred

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Posted 31 May 2005 - 05:32 PM

QUOTE(Soph.E. @ May 31 2005, 06:28 PM)
Oh just remembered something from doing past papers in rushed chemistry revision yesterday - came across something which looked like Benedict's solution is the same thing as Fehling's solution... is that right?! Seems kinda weird that they'd have two names for the same thing. Or I could just have totally got the wrong end of the stick  stuart.gif

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Yeah, I'm pretty sure they're the same thing. I think they're trying to use the term "Fehling's solution" now rather than "Benedict's solution".
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#202 YIC

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Posted 31 May 2005 - 05:36 PM

QUOTE(tupacshakur @ May 31 2005, 06:32 PM)
QUOTE(YIC @ May 31 2005, 05:31 PM)
QUOTE(tupacshakur @ May 31 2005, 06:30 PM)
what was the answer to why they used STARCH?

i said because its easier to see a colour change.

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What was the question again?

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why was starch used

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I cannot remember answering that one dry.gif I think I can remember talking about blue/ black colour in one of th questions.

Was that question in amongst the one about the Conc. PPA?

#203 bred

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Posted 31 May 2005 - 05:37 PM

Yeah.
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#204 tupacshakur

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Posted 31 May 2005 - 05:37 PM

QUOTE(YIC @ May 31 2005, 05:36 PM)
QUOTE(tupacshakur @ May 31 2005, 06:32 PM)
QUOTE(YIC @ May 31 2005, 05:31 PM)
QUOTE(tupacshakur @ May 31 2005, 06:30 PM)
what was the answer to why they used STARCH?

i said because its easier to see a colour change.

View Post



What was the question again?

View Post



why was starch used

View Post



I cannot remember answering that one dry.gif I think I can remember talking about blue/ black colour in one of th questions.

Was that question in amongst the one about the Conc. PPA?

View Post




i think it was the titration question

why was starch used?

i said because it gave a noticable colour change. Is that right huh.gif
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#205 bred

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Posted 31 May 2005 - 05:38 PM

It is an indicator. I guess your answer is basically saying just that.
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#206 YIC

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Posted 31 May 2005 - 05:39 PM

The titration one was about the vitamin C I think. Dunno if any starch in their

#207 YIC

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Posted 31 May 2005 - 05:41 PM

Oh goodness, if someone had the question paper right to see that question I would be sooooooooo grateful

#208 bred

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Posted 31 May 2005 - 05:41 PM

QUOTE(YIC @ May 31 2005, 06:39 PM)
The titration one was about the vitamin C I think. Dunno if any starch in their

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Isn't it all the same PPA? :/
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#209 YIC

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Posted 31 May 2005 - 05:42 PM

Hahahahah laugh.gif I have no clue

#210 tupacshakur

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Posted 31 May 2005 - 05:43 PM

it just said why was starch used.
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#211 sai

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Posted 31 May 2005 - 05:43 PM

i think there is one ppa on vitamin c and a seperate ppa on the iodine concentration thing

#212 gary

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Posted 31 May 2005 - 05:46 PM

QUOTE(tupacshakur @ May 31 2005, 05:37 PM)
QUOTE(YIC @ May 31 2005, 05:36 PM)
QUOTE(tupacshakur @ May 31 2005, 06:32 PM)
QUOTE(YIC @ May 31 2005, 05:31 PM)
QUOTE(tupacshakur @ May 31 2005, 06:30 PM)
what was the answer to why they used STARCH?

i said because its easier to see a colour change.

View Post



What was the question again?

View Post



why was starch used

View Post



I cannot remember answering that one dry.gif I think I can remember talking about blue/ black colour in one of th questions.

Was that question in amongst the one about the Conc. PPA?

View Post




i think it was the titration question

why was starch used?

i said because it gave a noticable colour change. Is that right huh.gif

View Post



Said it showed the end point of the reaction.

#213 Ally

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Posted 31 May 2005 - 05:46 PM

QUOTE(bred @ May 31 2005, 06:18 PM)
In the distillation process...

A covalent bonds are broken and then re-made
B covalent bonds are broken
C van der waals are broken and then re-made
D van der waals are broken

View Post

Disillation is boiling and condensing water. When you boil it you break intermolecular bonds, you break the bonds between the water molecules, not the actual covelant bonds between the atoms. Then when you condense it you reform the bonds between the water molecules.

So it would be C, Van der Waals bonds are broken then remade.

#214 Tiger

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Posted 31 May 2005 - 05:47 PM

QUOTE(gary @ May 31 2005, 06:46 PM)
QUOTE(tupacshakur @ May 31 2005, 05:37 PM)
QUOTE(YIC @ May 31 2005, 05:36 PM)
QUOTE(tupacshakur @ May 31 2005, 06:32 PM)
QUOTE(YIC @ May 31 2005, 05:31 PM)
QUOTE(tupacshakur @ May 31 2005, 06:30 PM)
what was the answer to why they used STARCH?

i said because its easier to see a colour change.

View Post



What was the question again?

View Post



why was starch used

View Post



I cannot remember answering that one dry.gif I think I can remember talking about blue/ black colour in one of th questions.

Was that question in amongst the one about the Conc. PPA?

View Post




i think it was the titration question

why was starch used?

i said because it gave a noticable colour change. Is that right huh.gif

View Post



Said it showed the end point of the reaction.

View Post



I said that to biggrin.gif

#215 Tiger

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Posted 31 May 2005 - 05:49 PM

QUOTE
the total volume was kept the same in the shaded bit

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Same

#216 YIC

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Posted 31 May 2005 - 05:49 PM

QUOTE(gary @ May 31 2005, 06:46 PM)

Said it showed the end point of the reaction.

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Yea, I think now I can kinda remember as I am sure I used the phrase "end-point of the reaction". However, I am sure the question was a bit more complicated rather than why the starch was used. I understand though as no one has the papr in front of them laugh.gif

#217 tupacshakur

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Posted 31 May 2005 - 05:50 PM

QUOTE(YIC @ May 31 2005, 05:49 PM)

Yea, I think now I can kinda remember as I am sure I used the phrase "end-point of the reaction". However, I am sure the question was a bit more complicated rather than why the starch was used. I understand though as no one has the papr in front of them laugh.gif

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is it ok to say it showed a better colour change?
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#218 Ally

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Posted 31 May 2005 - 05:50 PM

QUOTE(gary @ May 31 2005, 06:46 PM)
Said it showed the end point of the reaction.

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Well done!

That was the 30,000th post on HSN. tongue.gif biggrin.gif

#219 Tiger

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Posted 31 May 2005 - 05:50 PM

QUOTE(tupacshakur @ May 31 2005, 06:23 PM)
QUOTE(Soph.E. @ May 31 2005, 05:22 PM)
- I said both hydrogen and carbon dioxide would be left at the end because:

metal + acid                = salt + hydrogen gas
metal carbonate + acid = salt + water + carbon dioxide gas

and there was a metal and a metal carbonate reacting with the acid. (Think I'm remembering this right!) Standard grade stuff though really isn't it... always catches you out  huh.gif

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yaas i wrote that aswell

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me to biggrin.gif

#220 YIC

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Posted 31 May 2005 - 05:50 PM

QUOTE(ally @ May 31 2005, 06:46 PM)
QUOTE(bred @ May 31 2005, 06:18 PM)
In the distillation process...

A covalent bonds are broken and then re-made
B covalent bonds are broken
C van der waals are broken and then re-made
D van der waals are broken

View Post

Disillation is boiling and condensing water. When you boil it you break intermolecular bonds, you break the bonds between the water molecules, not the actual covelant bonds between the atoms. Then when you condense it you reform the bonds between the water molecules.

So it would be C, Van der Waals bonds are broken then remade.

View Post



Cool Ally. That is what I put wink.gif





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