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March 29, 2024, 01:16:01 pm

Author Topic: VCE Chemistry Question Thread  (Read 2313546 times)  Share 

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lzxnl

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Re: VCE Chemistry Question Thread
« Reply #690 on: April 20, 2014, 09:50:08 pm »
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Yep. Hydrolysis normally results in the breaking up of a molecule into two. So for instance repeatedly hydrolysing urea (an amide) yields CO2 and two lots of NH3, hydrolysing ATP gives ADP and a phosphate ion and hydrolysing an ester gives an alcohol and a carboxylic acid. In all of these cases one of the reactants is broken up.
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Jawnle

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Re: VCE Chemistry Question Thread
« Reply #691 on: April 20, 2014, 09:57:42 pm »
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Yep. Hydrolysis normally results in the breaking up of a molecule into two. So for instance repeatedly hydrolysing urea (an amide) yields CO2 and two lots of NH3, hydrolysing ATP gives ADP and a phosphate ion and hydrolysing an ester gives an alcohol and a carboxylic acid. In all of these cases one of the reactants is broken up.

Would you agree that
Hydration: water molecules are added to the substance
Hydrolysis: Breaking-down process of molecule when it reacts with water, in other words, when it dissolves in water

lzxnl

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Re: VCE Chemistry Question Thread
« Reply #692 on: April 20, 2014, 10:02:21 pm »
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We wouldn't consider the dissolution of an ionic salt as hydrolysis, for instance.
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vox nihili

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Re: VCE Chemistry Question Thread
« Reply #693 on: April 20, 2014, 10:10:50 pm »
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Would you agree that
Hydration: water molecules are added to the substance
Hydrolysis: Breaking-down process of molecule when it reacts with water, in other words, when it dissolves in water

Hydro-water
lysis-breaking

You're breaking a molecule with water.


As lzxnl pointed out for us though, hydrolysis has nothing to do with dissolution.
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Blondie21

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Re: VCE Chemistry Question Thread
« Reply #694 on: April 21, 2014, 11:26:14 am »
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HOW do I find the monomers for the following polymers?
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Blondie21

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Re: VCE Chemistry Question Thread
« Reply #695 on: April 21, 2014, 11:36:01 am »
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BTW, do we need to memorise how each type of carbohydrate is formed i.e. suncrose is made from glucose + fructose?
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Rishi97

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Re: VCE Chemistry Question Thread
« Reply #696 on: April 21, 2014, 11:39:38 am »
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BTW, do we need to memorise how each type of carbohydrate is formed i.e. suncrose is made from glucose + fructose?

it would be good if you did know them since there aren't too many to remember. But it will definetly be helpful if you know the formation of sucrose because if you had to draw it, then you would draw a condensation reaction between glucose and fructose. I remember drawing sucrose in one of the questions from the textbook.
ps: this is a benefit of doing biol ;)
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saba.ay

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Re: VCE Chemistry Question Thread
« Reply #697 on: April 21, 2014, 11:53:12 am »
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HOW do I find the monomers for the following polymers?

You have to try and find the smallest repeating unit in each polymer chain. It's sometimes easier to try and find glycosidic or peptide, etc linkages to break them into monomers. One of the polymers is made from only one monomer while the other is made from 2 different monomers.

Rishi97

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Re: VCE Chemistry Question Thread
« Reply #698 on: April 21, 2014, 11:57:22 am »
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What structural similarities do the purine bases adenine and guanine share?
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Yacoubb

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Re: VCE Chemistry Question Thread
« Reply #699 on: April 21, 2014, 12:11:41 pm »
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What structural similarities do the purine bases adenine and guanine share?

Both are double-ringed structures.

Rishi97

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Re: VCE Chemistry Question Thread
« Reply #700 on: April 21, 2014, 12:16:52 pm »
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Both are double-ringed structures.

Tha answer says that adenine and guanine are derivatives of purine. What does this mean?
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vox nihili

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Re: VCE Chemistry Question Thread
« Reply #701 on: April 21, 2014, 12:22:25 pm »
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Tha answer says that adenine and guanine are derivatives of purine. What does this mean?

That they have a double ringed structure.

They're both synthesised from another chemical called purine, which gives them the double ring.
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Blondie21

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Re: VCE Chemistry Question Thread
« Reply #702 on: April 21, 2014, 12:50:29 pm »
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Tha answer says that adenine and guanine are derivatives of purine. What does this mean?

Rishi have a read of pg 204
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Rishi97

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Re: VCE Chemistry Question Thread
« Reply #703 on: April 21, 2014, 01:28:51 pm »
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How would I draw the structure of 1,3-butadiene?
What is diene?
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Re: VCE Chemistry Question Thread
« Reply #704 on: April 21, 2014, 01:36:21 pm »
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I never got my head around dilution, so can someone clarify? :/

So I have a stock standard solution: 1000mg/100mL  of caffeine
I want to make concentrations of 5mg/100ml, 10mg/100ml and 20mg/100ml caffeine.

Say for the first concentration I want to obtain (5mg/100ml), do i simply get like 0.5mL of the standard (5mg/0.5mL), and then dilute it into 100mL?
Is that how it works? o.o
Or is my logic wrong. hahhaha


Thanks!

So initially, you have 1000mg/100mL, then after dilution, you have 5 mg/100 mL, you can see that 1000/5 = 200 . If concentration decrease by 200 folds, volume must have increased by 200 folds. Hence, 100 x 200 = 20 000 mL i.e if you fill the volume up to 20 00mL (adding 19 900 mL), you get a concentration of 5 mg/100mL.

Does my method still work? o.o
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