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I’m hiring!. Homework Graders Pay = 1 extra credit point/10 papers graded Qualifications : No TUs, BD, LD Availability before/after school or 5 th period lunch. No nepotism/cronyism will be tolerated. HOMEWORK DUE MIErCOLES. If you haven’t done so already, read chapter 3!

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i m hiring
I’m hiring!

Homework Graders

  • Pay = 1 extra credit point/10 papers graded
  • Qualifications:
    • No TUs, BD, LD
    • Availability before/after school or 5th period lunch.
    • No nepotism/cronyism will be tolerated
homework due miercoles
HOMEWORK DUE MIErCOLES
  • If you haven’t done so already, read chapter 3!
  • P114 - 115: #22, #32, #34
stoichiometry
Stoichiometry

The quantitative study of chemical reactions

use stoichiometry to answer these questions
Use stoichiometry to answer these questions:

How much product will form from a given amount of reactants?

How much of the reactants is necessary to form a given amount of product?

step 1
Step 1
  • Predict products of a reaction if they are not given to you
  • Balance the coefficients of the reaction
step 2
Step 2
  • Use molar conversion to change whatever is given (volume, mass or concentration) to moles
step 3
Step 3
  • Use the molar ratio from the balanced reaction to convert the moles of what is given to the moles of what’s asked for.
step 4
Step 4
  • Use conversion factors (moles  mass, volume or M) to change the moles of what is asked for to the proper unit
slide12
Calculate the mass of solid product formed when 18.4 g of MgBr2 is combined with a solution containing excess K2CO3.
limiting reactant
Limiting Reactant
  • The reactant that gets used up
  • The reactant that determines the amount of product formed
excess reactant
Excess Reactant
  • The reactant that Does Not get used up
when i give you quantities of more than one reactant
When I give you quantities of more than one reactant:

 You must figure out which one is limiting

3a 2b a 3 b 2 which reactant is limiting
3A + 2B  A3B2Which reactant is limiting?
  • Do Step 1 and then Step 2 for both A & B.
  • Pick A (your chemistry grade?)
  • Use the molar ratio that relates A to B to determine how much of B would be needed to completely use up the moles of A
  • If there are more than enough moles of B, A is limiting
  • If there not enough moles of B, then B is limiting
  • Use limiting reactant for steps 3 & 4
slide17
Calculate the mass of glucose (C6H12O6) formed when 880 g of carbon dioxide is combined with 720 g of water in photosynthesis
how to make a blt sandwich
How to make a BLT sandwich:

2 LL

(lettuce

leaves)

5 BS

(bacon

slices)

3 TS

(tomato

slices)

2 PB

(pieces

bread)

+

+

+

so reaction is
So reaction is:
  • 2 PB + 3 TS + 5 BS + 2 LL  1 BLT

1 BLT

masses of reactants product
Masses of reactants + product:
  • 1 PB = 50.0 g
  • 1 TS = 60.0 g
  • 1 BS = 20.0 g
  • 1 LL = 5.0 g
  • 1 BLT = 390.0 g
how many blts
How many BLTs?
  • PB = 3,356.7 g
  • TS = 4,789.2 g
  • BS = 2,789.4 g
  • LL = 789.2 g

Get answer in significant digits and then round down to whole number of BLTs.

theoretical yield
Theoretical Yield
  • The amount determined through stoichiometry
  • The amount solved for on paper
experimental yield
Experimental Yield
  • The amount obtained in the lab
  • Actual yield
percent yield
Percent yield
  • % Yield = (Exp/Theo) x 100 %
slide27
510 g PH3 was obtained when 0.62 kg of P4 reacts with excess H2. Calculate percent yield.
slide28
4.61 g of lead(II)iodide was obtained when 66.2 g of lead(II)nitrate was added to 750 ml 0.10 M potassium iodide. Calculate the % yield.
slide30
Determine the volume of NH3 formed at STP when 2.0 x 1027 molecules N2 reacts with 4.0 kg of H2:
slide32
Calculate the mass of solid product formed when 41.6 g of barium chloride is added to 250 ml of 0.40 M potassium sulfate giving a 50.0 % yield:
slide33
Calculate the mass of solid product formed when 2.00 g of calcium bromide is added to 250 ml of 0.40 M sodium sulfate:
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