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Chemistry 4-14-09 Stoichiometry Problems 2

CHEMISTRY:  Hey guys, here’s the lecture from Tuesday on the rest of the stoichiometry problems.  Mole-mass, mass-mole, and mass-mass problems.

~ by Ms. Skinner on April 14, 2009. Tagged: , , , , ,

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56 Responses to “Chemistry 4-14-09 Stoichiometry Problems 2”

  1.   anna knecht Says:
    April 15th, 2009 at 10:51 PM

    Can mass go to mass directly?

    [Reply]

    jeeen yoon Reply:
    April 15th, 2009 at 11:46 PM

    nope you should to know the “road map”
    massA → molA → molB → massB

    [Reply]

  2.   Molly McCarter Says:
    April 16th, 2009 at 9:32 AM

    Can you go from moles to mass?

    [Reply]

    Austin Welch Reply:
    April 16th, 2009 at 10:16 PM

    yes, you have to go from moles to moles then to mass.

    [Reply]

  3.   kara stevenson Says:
    April 16th, 2009 at 9:32 AM

    how do you go from mass to moles?

    [Reply]

    Olivia Williams Reply:
    April 16th, 2009 at 2:57 PM

    Kara- to go from mass to moles, use this road map:

    mass A to mass B to moles B

    [Reply]

  4.   macy morris Says:
    April 16th, 2009 at 9:33 AM

    what is the order to do mass mole problems?

    [Reply]

  5.   chris casto Says:
    April 16th, 2009 at 9:33 AM

    how do you write mass to mole problems

    [Reply]

    Jake Wilson Reply:
    April 17th, 2009 at 1:54 PM

    mass a- mole a- mole b

    [Reply]

  6.   Taylor C Says:
    April 16th, 2009 at 9:38 AM

    What are the steps to do Mole to Mass problems?

    [Reply]

    jordan james Reply:
    April 16th, 2009 at 10:50 PM

    You go from mol A to mol B to mass B.

    [Reply]

  7.   Luke Bishop Says:
    April 16th, 2009 at 9:40 AM

    Mass A –> Mol A –> Mol B is how you write Mass to Mole problems

    [Reply]

  8.   Leslie Martin Says:
    April 16th, 2009 at 9:43 AM

    What is the limiting reactant?

    [Reply]

    mary gates talbot Reply:
    April 17th, 2009 at 11:01 PM

    its the reactant that limits the amount of reaction that can occur in an experiment.

    [Reply]

  9.   Katherine Penn Says:
    April 16th, 2009 at 9:48 AM

    Leslie-the limiting reactant is the reactant that limits the amount of the other reactant that can combine and the amount of product that can form in a chemical reaction.

    [Reply]

  10.   Dj Brown Says:
    April 16th, 2009 at 10:06 AM

    When working a stoichiometry problem such as a mass-mole problem do you round the numbers before or after the equation

    [Reply]

  11.   Beth Ann Gooch Says:
    April 16th, 2009 at 10:29 AM

    DJ: you round after you work the probem

    [Reply]

    mary gates talbot Reply:
    April 20th, 2009 at 2:43 PM

    you simply have to use sig figs.. but dont use them all throughout the problem, only on your final answer. :)

    [Reply]

  12.   ashley white Says:
    April 16th, 2009 at 10:39 AM

    Mol A – Mol B – Mass B is the steps for a mol to mass problem.

    [Reply]

  13.   elizabeth anderson Says:
    April 16th, 2009 at 11:03 AM

    when do you use coefficiants for these types of problems?

    [Reply]

    Carlee Edwards Reply:
    April 17th, 2009 at 5:01 PM

    Elizabeth: You use the coefficiants when you have a mole ratio, which is mole over mole.

    [Reply]

  14.   Jalen Gipson Says:
    April 16th, 2009 at 11:04 AM

    When going from mass to mole do you always use the periodic table?

    [Reply]

    Daniel Houston Reply:
    April 16th, 2009 at 11:35 AM

    to Jalen’s “When going from mass to mole do you always use the periodic table?”

    yes, the wieght of a mol is listed on the periodic table. which is why we have to check it so frequently. the exception is when u have memorized the particular element that is needed to convert.

    [Reply]

  15.   josh hopkins Says:
    April 16th, 2009 at 11:25 AM

    what are the 4 types of stoichiometry problems?

    [Reply]

    jordan james Reply:
    April 20th, 2009 at 2:46 PM

    well.. there are 4 different kinds of them…

    1. mole-mole problems. (easy ones!)
    2. mole-mass problems.
    3. mass-mass problems.
    4. mass-mole problems.

    :)

    [Reply]

  16.   Kevin McKenzie Says:
    April 16th, 2009 at 11:26 AM

    well, to answer Molly’s question, yes, but you have to go from mole A to mole B then to the mass of B, I really hope this helps you Molly

    [Reply]

  17.   Michael Jekal Says:
    April 16th, 2009 at 2:12 PM

    Josh Hopkins : The 4types of stoichiometry problems are mole-mole, mole-mass, mass-mole and mass-mass

    [Reply]

  18.   taylor meador Says:
    April 16th, 2009 at 2:13 PM

    Elizabeth…
    coefficients tell you the mole ratios in a problem

    [Reply]

  19.   whitney Says:
    April 16th, 2009 at 2:16 PM

    do you use codfficients with mole-mole ratios?

    [Reply]

  20.   Katie McMurtry Says:
    April 16th, 2009 at 2:41 PM

    Josh:
    the four types are mole-mole, mole-mass, mass-mole, and mass-mass

    [Reply]

  21.   Alan Baur Says:
    April 16th, 2009 at 2:56 PM

    Molly, you can go from moles to mass.

    [Reply]

  22.   Emily Hugh Says:
    April 16th, 2009 at 3:27 PM

    When do I use coefficients?

    [Reply]

  23.   Shelby Lee Says:
    April 16th, 2009 at 4:06 PM

    Emily-
    The coefficients are used for mole ratios.

    [Reply]

  24.   audrey ford Says:
    April 16th, 2009 at 7:35 PM

    since you can go from mole A to mole B, why cant you go from mass A to mass B?

    [Reply]

  25.   benjamin arthur Says:
    April 16th, 2009 at 8:08 PM

    so why can’t you go from mass to mass?

    [Reply]

  26.   Mika Dedman Says:
    April 16th, 2009 at 11:27 PM

    would it be possible to have a mass to mass to mass problem?
    that would be difficult

    [Reply]

  27.   nick geeslin Says:
    April 17th, 2009 at 7:23 AM

    whitney: you use coefficients in mole ratio

    [Reply]

  28.   ryan dubois Says:
    April 17th, 2009 at 2:24 PM

    wat is the first step in finding the limiting reactant

    [Reply]

  29.   Allen Wade Says:
    April 17th, 2009 at 2:28 PM

    What are the types of stoichiometry problems?

    [Reply]

  30.   Nikkie olson Says:
    April 17th, 2009 at 9:06 PM

    What is an excess reactant?

    [Reply]

  31.   JD Tackett Says:
    April 17th, 2009 at 9:21 PM

    nikki, the excess reactant is the reactant that is not used on a chemical reaction

    [Reply]

  32.   Emma Says:
    April 17th, 2009 at 11:56 PM

    how do you do mole mole?

    [Reply]

  33.   joey lunati Says:
    April 17th, 2009 at 11:58 PM

    how do you know when to use a limiting

    [Reply]

  34.   Lauren McGrath Says:
    April 18th, 2009 at 1:06 PM

    allen: mole:mass mass:mole mass:mass

    [Reply]

  35.   John Bailey Cox Says:
    April 18th, 2009 at 2:49 PM

    Joey, you use the limiting reactant method if there are more than one masses given.

    [Reply]

  36.   willbellflower Says:
    April 18th, 2009 at 10:45 PM

    how do you find the limiting reactant. sorry it is late Ms.Skinner.

    [Reply]

  37.   Ashley Hennessee Says:
    April 19th, 2009 at 7:28 PM

    What do you do next after finding the Limited Reaction?

    -Sorry this is late!

    [Reply]

  38.   Tim Morris Says:
    April 20th, 2009 at 12:12 PM

    hey Mrs. Skinner, what was the name of that chemistry sight you siad had a really good explanation of electrostatics?

    [Reply]

    Ms. Skinner Reply:
    April 20th, 2009 at 7:53 PM

    Try a couple of companies that sell the equipment that you’re using – a company called Educational Innovations at teachersource.com has it right on the front page, and another company at arborsci.com has some really good stuff when you click on the items and also on their Cool Stuff link. Search through their sites and let me know what you find!

    [Reply]

  39.   Anna Knecht Says:
    April 20th, 2009 at 1:38 PM

    Is the Percent yeild formula

    % yeild= ay/ty?

    [Reply]

    Nicole Crawford Reply:
    April 20th, 2009 at 9:46 PM

    yes anna, but don’t forget about multiplying by 100. then you will find the percent yield.
    good luck!

    [Reply]

  40.   trey skinner Says:
    April 20th, 2009 at 3:15 PM

    What does % yield equal?

    [Reply]

  41.   Emily Hurdle Says:
    April 20th, 2009 at 6:21 PM

    Trey:
    percent yield=actual/theoretical yield X 100

    [Reply]

  42.   cathy dunn Says:
    April 20th, 2009 at 7:40 PM

    hey ms. skinner, can we substitute peanut butter chips for the chocolate chips in the kitchen lab due on wednesday?

    [Reply]

    Ms. Skinner Reply:
    April 20th, 2009 at 7:43 PM

    Sure! That’ll be fine!

    [Reply]

  43.   TyLeRedd Says:
    April 30th, 2009 at 8:46 PM

    wow. the double replacement reaction was on here/

    [Reply]

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