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October 10, 2025, 02:45:58 am

Author Topic: Need help for question from Heinemann Chemistry 2 book  (Read 1257 times)  Share 

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dodgedanpei

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Need help for question from Heinemann Chemistry 2 book
« on: December 22, 2009, 06:48:03 pm »
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Chapter 1. Question 7.
Research a consumer good whose purity is currently making news. Find out how this product is analysed.

I have no idea on how to do this question. Any ideas?

Thanks in advance.

xD_aQt

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #1 on: December 22, 2009, 07:03:09 pm »
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Table 1.1 provides a guide

dodgedanpei

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #2 on: December 22, 2009, 07:24:27 pm »
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Got any idea on what consumer good to research? Sorry if it's a stupid question.

Studyinghard

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #3 on: December 22, 2009, 08:15:15 pm »
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I dont think these questions are even important. Do these types of questions ever come into the exam/?>
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darkphoenix

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #4 on: December 22, 2009, 11:39:33 pm »
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I dont think these questions are even important. Do these types of questions ever come into the exam/?>

Its probably holiday homework.
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dodgedanpei

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #5 on: December 23, 2009, 04:49:13 pm »
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Yeah it is. I have to complete all questions...

darkphoenix

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #6 on: December 23, 2009, 05:29:09 pm »
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Wow serious? Our school only made us do Q2,4,5 and 6
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S2paramore

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #7 on: December 24, 2009, 05:29:56 pm »
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I remember a while ago there was this issue in China where dodgy milk producers would taint milk with melamime.
Here's the link: http://china-goods-news.blogspot.com/2008/10/how-to-detect-melamine-in-china-food.html

I think this bit is relevant to what you're looking for!

"GC-MS, LC-MS/MS & HPLC

The European Commission had recommended that all EU member states use gas chromatography-mass spectrometry (GC-MS) to analyze imports of wheat gluten and other raw materials from developing countries — in particular China. The US Food and Drug Administration (FDA) used the method to test for melamine and similar compounds in wheat gluten and pet food ingredients from China.

The samples are then separated into their parts using a process called Liquid Chromatography-tandem Mass Spectrometry (LC-MS/MS).

LC-MS/MS

Mass spectrometry, which can detect very low evels of a compound, is then used to analyse them. LC-MS/MS testing is capable of detecting melamine levels as low as 0.05 parts per million (ppm). LC-MS/MS is a more precise instrument than GC-MS. This method would be used to test for melamine in the raw materials imported for use in creamers, milk powder and baby formula.

The technique is 500 times more sensitive in detecting melamine than high-performance liquid chromatography (HPLC), which was previously favored by the health department."

You can also go to http://en.wikipedia.org/wiki/Melamine#Testing_in_food

Hope this helps! :)
« Last Edit: December 24, 2009, 05:32:43 pm by S2paramore »
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dodgedanpei

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #8 on: December 28, 2009, 05:24:50 pm »
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Oh wow. Thanks alot for that!

and

Wow serious? Our school only made us do Q2,4,5 and 6
Damn you :P
« Last Edit: December 28, 2009, 05:26:31 pm by dodgedanpei »

jimmy999

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #9 on: December 29, 2009, 02:01:42 pm »
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I never bothered with questions like that. I only did explanations if it was in checkpoints or took up less than 2 lines
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kyzoo

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #10 on: December 29, 2009, 02:08:00 pm »
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I wouldn't bother with questions that require research. ^ Explanations are a different story though. And I don't really understand why our school never gives us holiday homework for the summer holidays even though most of my friends in other schools get it.
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S2paramore

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Re: Need help for question from Heinemann Chemistry 2 book
« Reply #11 on: December 30, 2009, 11:22:54 am »
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Oh wow. Thanks alot for that!
No problem! :)

I wouldn't bother with questions that require research. ^ Explanations are a different story though. And I don't really understand why our school never gives us holiday homework for the summer holidays even though most of my friends in other schools get it.
I agree with kyzoo; I don't think the questions in Chapter 1 really matter much. Our school doesn't make us do them hehe. :P
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