starch and sucrose questions - (Feb/19/2006 )
Hello,
Can someone help me solve these questions:
I did an experiment on sucrose (nonreducing sugar) where I added Benedict's solution. The test gave a negative result & showed that sucrose was not a reducing sugar. Benedict's is basic. What would happen to sucrose if Benedict's was acidic instead of basic? Why?
Also, what is the product of the hydrolysis of starch? I said it is many glucose monomers, where
(C6H12O6)n + H2O = C6H12O6
LODYH?
If this is an abbreviation for something, please spell it out.
this is a suggestion that perhaps I think you want us to do your homework for you; if this is not true I heartily apologize
I suspect you can find what you need if you spend a few minutes at www.google.com. I know you can find what you need if you spend more than a few minutes there.
I also suspect your textbooks might be helpful here; your teacher should also be an excellent resource.
aimkins you're great...
i found in almost 2seconds many infos for your pb. I invite you to check them here...
Reasonable assumptions to make, but this is why I never assume things. You never know what the other person is thinking. And my suggestion to you is that you remember this before you assume again.
I am not looking for someone to do my homework. The first question was a dicussion question presented to us by the teacher. I was hoping someone could provide some way to find the answer. I never asked for the answer itself. I asked for help to solve them. And this is a message board to receive help correct?
And yes, I have already looked on google. There is obviously much information on this topic. However, if I had found the answer the answer on there, I doubt I'd waste my time typing up the question on this board and wait for someone to help. Correct?
Anyway, it would not matter anymore. We discussed this in class today and the answer is yes to both questions. Normally, Benedict's is a basic solution and sucrose would test negative to it because it is a nonreducing sugar. If Benedict's is acidic however, then theoretically sucrose would become a reducing sugar since the bonds between the sucrose-Benedict's complex would break and sucrose will reduce to glucose + fructose. Under basic conditions, it would not do this.
And the second question is where starch will break down into glucose monomers (reducing sugars).
I don't think directing me to another website was a good idea. It is very easy to tell someone to search for the answer online. Anyone can do this. If you knew the answer, then I don't see why the reply could not have been a guidance to get to the answer by asking me to reflect on how the basic Benedict's test reacts with the bonds in sucrose and take it from there, instead of automatically thinking that I am asking for others to do my homework. That is insulting.
"I don't think directing me to another website was a good idea. It is very easy to tell someone to search for the answer online. Anyone can do this. If you knew the answer, then I don't see why the reply could not have been a guidance to get to the answer by asking me to reflect on how the basic Benedict's test reacts with the bonds in sucrose and take it from there, instead of automatically thinking that I am asking for others to do my homework. That is insulting."
I am sorry to have insulted you, but my answer still stands and I would not change it. there are frequently people who post to this forum hoping for us to answer their homework questions for them; the reason we are here today is because WE did the homework, read the books, took the notes, and did the online searches to find the information ourselves, and that is why we are scientists today.
sometimes homework-type questions are answered by bored or sympathetic people. however, if "anyone" can find the answer online, then why ask us to waste our time regurgitating for you? we are here to help if you cannot find the answer for your schoolwork yourself, and I certainly do appreciate that you asked instead of demanding. however, a 'please' and a 'thank you' go a LONG way here and you are much more likely to get help if you use them.
please also note that the ability to find basic science information online or from your textbook is not just useful, it is a requirement in this field and we are not doing you any favors if we do it for you. you gave us the test that you used, the chemical properties involved, and the result that you obtained; then you asked for help to solve the problem. if all you wanted was a tool to find the answer on your own, then that is exactly what I gave you when I suggested you check google. there are many many many websites out there that can answer your question, if you take the time to look properly and think about what you already know (i.e. the basic nature of the Benedict's you used and the interaction with the glucose molecules)
WOW, this guy is a jerk!!! He admits it was homework (discussed with his TEACHER) as well as admitting that there is alot of information on google --I guess he felt it was below him to actually surf that information to find his own answers! --How exactly does he think we find answers?? 
That is seriously funny!!! What an ungrateful person!!! A perfect example of how NOT to ask for help!!!!
BTW--Great response aimikins!!! I could not have been so polite!! 
I was feeling rather annoyed when I wrote it. after the fact, I was hoping I hadn't gone too far and Bioforum or one of the other moderaters wouldn't delete me 
he irritated me with his self-righteousness
oh well, WUTB. but I am glad I wasn't the only one annoyed