Chemistry 2006/ 2007 Club*** - page 10

I am starting Chem II this semester. Anyone want to start a club??? :rolleyes:... Read More

  1. by   lilmama007
    Quote from FNPhopeful
    Could someone show me how to work this out, Please?



    What is the number of hydrogen atoms in 5.63 moles of Ca(C2H3O2)2 ?




    Thanks!!
    Don't look too much into it

    set up the DA. 5.63 moles Ca(....) times 3 moles H per 1 mole Ca(...) times 6.02 X 10^23 H atoms per 1 mole H. Just cancel on the DA and you will end up with the number of H atoms.
  2. by   lilmama007
    Quote from FNPhopeful
    My professor non chalantly eluded to the fact some chem exam questions may have 'distracters'...........Look at this problem. (stoichiometry)


    How many moles of CO2 can be produced by the complete combustion of 3.1 moles C2H6?

    2 C2H6 + 7 O2 -------------> 4 CO2 + 6 H2O



    Is the term complete combustion a distracter? Because it definitely distracts me! The actual working out of the problem has nothing do to with wether it a complete combustion or not,.............because similar problems will say complete reaction or complete combustion or just 'reaction'

    But I'll look at it initially and go 'complete combustion'? now what does that change?
    Just do it the way you always have. I mean you have the number of moles just set up the ratio because you're still producing something right?
  3. by   Angels'
    Basic Chemistry summer 2006 ?

    A pre-nursing student,
    Angels'
  4. by   beepeadoo
    Quote from FNPhopeful
    My professor non chalantly eluded to the fact some chem exam questions may have 'distracters'...........Look at this problem. (stoichiometry)


    How many moles of CO2 can be produced by the complete combustion of 3.1 moles C2H6?

    2 C2H6 + 7 O2 -------------> 4 CO2 + 6 H2O



    Is the term complete combustion a distracter? Because it definitely distracts me! The actual working out of the problem has nothing do to with wether it a complete combustion or not,.............because similar problems will say complete reaction or complete combustion or just 'reaction'

    But I'll look at it initially and go 'complete combustion'? now what does that change?
    Yes I agree, just set up the ratios. 2 mol of C2H6 will give you 4 mol CO2.

    Why say complete combustion? Well, for one thing, we don't know from just looking at this what the limiting agent is... that is, if we have enough O2. Saying complete combustion tells us that enough O2 was present to burn all the ethane.
  5. by   Kat22
    Complete combustion means that there is not incomplete combustion which would leaving CO + CO2 + H20 as products
  6. by   beepeadoo
    Quote from Kat22
    Complete combustion means that there is not incomplete combustion which would leaving CO + CO2 + H20 as products
    I'm not sure I understand. The chemical equation shows CO2 and H2O as products, but it's telling her it's complete?
  7. by   LauretteB
    hi. i'm new and will be starting intro. to chem on 5/9/06. would love to be a part of the study group! feel free to email me and/or post. i'll be checking in frequently. hope we can all help each other thru this icky course. lol

    laurette (aka laurie)

    Quote from dreambig
    i am starting chem ii this semester. anyone want to start a club???
  8. by   RNin2009
    Quote from lauretteb
    hi. i'm new and will be starting intro. to chem on 5/9/06. would love to be a part of the study group! feel free to email me and/or post. i'll be checking in frequently. hope we can all help each other thru this icky course. lol

    laurette (aka laurie)

    hi laurette, chemistry is not as bad as you think, enter the course with confidence and you will make it.

    i am only a week away from my final exams and honeslty it's been very good for me because i kept a positive attitude about it and never allowed it to intimidate me.

    i wish you luck!
  9. by   Angels'
    My basic chemistry class starts about June 5 '06. An online chemistry study club may be helpful.

    Angels'
  10. by   stacyinMD
    PH question

    If you an acidic solution that has a pH of 1 and you add a basic solution that has a pH of 1 they would neutralize right? So would the pH of the combined solutions be 7 or 0?

    TIA!
  11. by   FoxyRoxy21
    I had my 3rd test last night for Chemistry. The test consisted of polymers, acids, basis, balancing chemical equations. I did all the problems that I knew and then I drew a blank on four out of the thirty-five. As I a prayed for the answers to come to me the fire alarm went off. My prof. looked out the hall and there was smoke. Yes a FIRE during my test!!!!!!! It ended up we had to finish the test in the parking lot. By this point there were only five students left. My prof. ended up giving us some 'clues' to the problems we where having difficulty with. How strange is this????? I am just glad it is over. Two weeks till my Chem Final.
  12. by   droopy1592
    Quote from stacyinMD
    PH question

    If you an acidic solution that has a pH of 1 and you add a basic solution that has a pH of 1 they would neutralize right? So would the pH of the combined solutions be 7 or 0?

    TIA!
    Your question makes no sense. There's no such thing as a "basic" solution with a PH of 1. Anything with a PH of LESS than 7 is generally considered acidic. Basic is above 7.
    Last edit by droopy1592 on May 4, '06
  13. by   stacyinMD
    Quote from droopy1592
    Your question makes no sense. There's no such thing as a "basic" solution with a PH of 1. Anything with a PH of LESS than 7 is generally considered acidic. Basic is about 7.
    Ooops... sorry I meant neutralized. I had a question on an assignment I turned in tonight. I can't remember exactly how the question was phrased...it was a dilution question. But I was able to get the answer. Thanks though!

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