Water Vapor Pressure Chart

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Simulation

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Answer key link

Correct in red pen.  The right-hand column on the second page will be graded by me.

KEY

Next writing assignment

Earth is fortunate to fall in the "Goldilocks Zone" and be at just about the right temperature for life to exist.  However another major factor that supports life on our planet is our atmosphere.  Describe three reasons that EACH of our neighboring planets could not support life at their surfaces.  Use the following article in your response:   Chem Matters Article

Video for reading a caliper

Check this out:   YouTube

Last Weekly Assignment! (due Thursday)

Before you start the homework I will remind you that the prefix "kilo-" means 1000, resulting in the conversions:         1 kJ = 1000 J
                      and  1 kcal = 1000 cal

A kilocalorie is the type of calorie that we are used to when we look at nutritional information, and because it is so common scientists have decided to denote it with a "capital" c as follows:   Cal  
           So any time you see Cal or Calorie, think kcal !!!


Do the following problems from the worksheets handed out in class:
#35,37,38,40,41,46,47,52,54,71,72

(Without some searching on your own, problems 37, 38, and 71 will not be possible for you to do until after Wednesday's lecture.)

#14 and #15 on the homework due 12/19

14. 

2 H₃PO₄ + 3 Ca(OH)₂   à  Ca₃(PO₄)₂ + 6 H₂O

0.75 L x (6 mol/L) = 4.5 mol H₃PO₄

4.5 mol H₃PO₄ ∙ (6 mol H₂O/2 mol H₃PO₄) ∙ (18.0128 g H₂O/ 1 mol H₂O) = 243 g water

4.5 mol H₃PO₄ ∙ (1 mol Ca₃(PO₄)₂/2 mol H₃PO₄) ∙ (310 g Ca₃(PO₄)₂/1 mol Ca₃(PO₄)₂) = 698 g calcium phosphate

15. 

3 H₂SO₄ + 2 Al(OH)₃ à  Al₂(SO₄)₃ + 6 H₂O

0.250 L ∙ (2.5 mol Al(OH)₃ / 1 L) = 0.625 mol Al(OH)₃

0.625 mol Al(OH)₃ ∙ (3 mol H₂SO₄/2 mol Al(OH)₃) = 0.9375 mol H₂SO₄

18.0 = 0.9375/x    

X = 0.0521 L = 52.1 mL H₂SO₄