Chemistry 4-17-09 Limiting Reactants

CHEMISTRY: Hey guys, here’s the lecture from Friday on limiting reactants. Pay attention to the details. You can do it!! Have a great weekend!

~ by Ms. Skinner on April 20, 2009. Tagged: limiting reactant, stoichiometry

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60 Responses to “Chemistry 4-17-09 Limiting Reactants”

Leslie Martin Says:
April 20th, 2009 at 7:43 PM
What is the theoretical yield?

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John Eason Says:
April 20th, 2009 at 9:13 PM
Leslie-
The theoretical yield is the amount of product you calculate from a stoichiometry problem.

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aniah lust Says:
April 20th, 2009 at 9:44 PM
Is it the actual or theoretical yield that is given in the problem? And which one goes on top in the formula?

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Olivia Williams Says:
April 20th, 2009 at 10:21 PM
what is our chemisrty homework tonight? the page numbers are wrong…

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Alan Baur Says:
April 21st, 2009 at 7:59 AM
Ms. Skinner, are there any limits to reactants of a percentage yield?

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Cody Doyle Says:
April 21st, 2009 at 11:09 AM
Can percent yield be more than 100 percent?

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Emily Hugh Says:
April 21st, 2009 at 7:29 PM
How do you know when you have to find the limiting reactant?

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Jalen Gipson Says:
April 21st, 2009 at 9:36 PM
Aniah- theactual yield is the one that is given in the problem, and it goes on top and the theoretical yield goes on bottom.

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Ashley Hennessee Says:
April 21st, 2009 at 9:51 PM
After finding the limited reaction,what is next?

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josh hopkins Says:
April 22nd, 2009 at 9:11 AM
How do you know when you have worked the problem what is the excess and what is the limited reactant?

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Brennon Chapman Reply:
April 22nd, 2009 at 2:04 PM
You compare it back to the original problem to see if you have enough

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Taylor Chambliss Says:
April 22nd, 2009 at 9:19 AM
Do you have to have the actual yield to find the theoretical yeild?

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macy morris Says:
April 22nd, 2009 at 9:30 AM
taylor yes you have to have actual yield to get the theoretical yield

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Tim Morris Says:
April 22nd, 2009 at 11:01 AM
ashley, after finding the limiting reactant you use that and the Q formula to find out how much product will be made.

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Shelby Lee Says:
April 22nd, 2009 at 3:56 PM
Emily-
You find the limited reactant if it says so in the problem or if you are solving a percent yield problem.

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Lauren McGrath Says:
April 22nd, 2009 at 5:08 PM
cody: %yield will never be more than 100

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courtney richmond Says:
April 22nd, 2009 at 5:17 PM
aniah-actual yield is the one that is given in the problem,and it goes on top.

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katherine penn Says:
April 22nd, 2009 at 7:03 PM
How do you figure out which number given in the problem is the actual yield?

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Katherine Robinson Reply:
April 22nd, 2009 at 7:16 PM
Katherine Penn: The actual yield is the amount the problem gives you of the product, not the reactant.

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jeeen yoon Says:
April 22nd, 2009 at 9:17 PM
what’s the excess reactant?

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JT Pitner Says:
April 22nd, 2009 at 9:53 PM
what time do we need to be at school tomorrow morning?

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emma wilson Says:
April 23rd, 2009 at 9:36 AM
how does you calculate the % yield?

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emma wilson Says:
April 23rd, 2009 at 9:38 AM
how do you find the percent yield?

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nikkie olson Says:
April 23rd, 2009 at 11:58 AM
emma,
percent yield is actual yield divided by theoretical yield multiplied by one hundred.

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BartO Says:
April 23rd, 2009 at 4:00 PM
How do you find actual yield?

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Dj Brown Says:
April 23rd, 2009 at 4:56 PM
Will you ever have to find the limiting reactant before finding percent yield?

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elizabeth anderson Says:
April 23rd, 2009 at 6:38 PM
bart- the actual yield is the amount of product given

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carson phillips Says:
April 23rd, 2009 at 6:43 PM
what is the theoretical yield?

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Brittany Chisholm Reply:
April 23rd, 2009 at 8:22 PM
carson the theoretical yield is what you calculate from the stoichiometry problem.

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TLR Says:
April 23rd, 2009 at 6:48 PM
When can we see our tests??

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Kara Stevenson Says:
April 23rd, 2009 at 7:57 PM
Why do you need to find the limiting reactant?

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Jed Porter Reply:
April 23rd, 2009 at 9:18 PM
Kare: Many companies need to know what their percent yield is, because they need to know how much reactant is being wasted. If they find out that percent yield is low, then they will do whatever possible to bring it up. For instance, purifying the reactants as much as possible (impurities is one reason percent yield can be low).

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Molly McCarter Says:
April 23rd, 2009 at 9:16 PM
how do you find the limiting reactant?

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whitney Says:
April 23rd, 2009 at 10:09 PM
what is the definition of % yield?

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Hannah Roberson Says:
April 24th, 2009 at 8:25 AM
What is actual yeild?

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Michael Jekal Says:
April 24th, 2009 at 8:39 AM
Hannah Roberson: Actual yield is the quantity of a product that is obtained from a chemical reaction.

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Rachel Laster Says:
April 24th, 2009 at 8:44 AM
Whitney: %yield is actual yield divided by theoretical yield times 100.

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jordan tupper Says:
April 24th, 2009 at 8:48 AM
whitney: [(actual yield) / (theoretical yield)] x 100% = percent yield

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Beth Ann Gooch Says:
April 24th, 2009 at 9:27 AM
Molly: First you find the number of moloes of each reactant. then you use mol of A to figure out how much mol of B you need. Last you compare what you have to what you need

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Beth Ann Gooch Says:
April 24th, 2009 at 9:30 AM
Bart: AY= % yield(actual yield) divided by 100

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Brandon Hale Says:
April 24th, 2009 at 9:32 AM
what is theoretical yield?

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Ryan DuBois Says:
April 24th, 2009 at 5:45 PM
it is the total amount

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mika dedman Says:
April 24th, 2009 at 6:02 PM
I think i did decent on the test today it was just so long =D anyway explorer zone was fun and i hope the kids loved it
p.s. i am now sick of fruity pebbles

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Katie McMurtry Says:
April 24th, 2009 at 8:49 PM
Brandon:
theoretical yield is the amount that could be produced if everything happened correctly

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Allen Wade Says:
April 24th, 2009 at 9:33 PM
How do you find % yield

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Austin Welch Reply:
April 24th, 2009 at 9:55 PM
% Yield is actual yield divided by theoretical yield times 100

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Austin Welch Says:
April 24th, 2009 at 9:48 PM
Actual Yield divided by theoretical yield multipled by 100 is % Yield

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JD Tackett Says:
April 24th, 2009 at 11:10 PM
ok exactly how do you determine what theoretical yield and actual yield is

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Manasi Says:
April 24th, 2009 at 11:19 PM
JD- to determine theoretical yield you find the maximum amount of product that can be produced

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Macee Rush Says:
April 25th, 2009 at 7:11 AM
hey, not sure if ill get credit for this but i woke up early this morning and realized i forgot to do my webpost by midnight last night….maybe i can?? =] haha

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Nathaniel W. Says:
April 25th, 2009 at 3:48 PM
what is percent yeild?

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Nathaniel W. Says:
April 25th, 2009 at 3:49 PM
what is percent yeild

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Brennon Chapman Reply:
April 28th, 2009 at 1:48 PM
Actual oveer theoretical x 100

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lauren mcgrath Says:
April 28th, 2009 at 2:57 PM
AY/TYx100

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jake dunaway Says:
April 29th, 2009 at 4:11 PM
how do you find the limiting reactant?

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Tanya Laing Says:
April 30th, 2009 at 10:16 AM
What is the name of the reactant that’s not limiting?

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mary gates atlbot Reply:
May 3rd, 2009 at 6:15 PM
that is called the excess reactant…

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daniel houston Says:
April 30th, 2009 at 10:25 AM
what is the formula to get theoretical yield?

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Ashley Hennessee Says:
April 30th, 2009 at 8:12 PM
Nathaniel,percent yield is theoretical yield divided by the actual yield multiplied by 100!

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Luke Ace Miller Says:
April 30th, 2009 at 8:13 PM
What is the step after balancing your chemical reaction when finding the limited reaction?

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