Read
Chapter 16.3, pp 510 - 513
Do
Problems 22, 23, pg 533
Tuesday, February 28, 2017
Monday, February 27, 2017
Homework due 2.28.17
Read
Chapter 16.2, pp 506 - 510
Do
Problems 13, 15, 16
Lab prep for Tuesday:
Please read instructions for this lab, as time is limited, and we won't have enough time if you don't prepare.
Chapter 16.2, pp 506 - 510
Do
Problems 13, 15, 16
Lab prep for Tuesday:
Please read instructions for this lab, as time is limited, and we won't have enough time if you don't prepare.
pH Lab
Test-tubes with a capacity of around 10 mL are ideal. The test-tubes should be as clean as possible. Test-tubes, dropping pipettes and measuring cylinders should be washed in tap water and then rinsed with deionised or distilled water.
Procedure
Students 1 and 2
Test-tubes with a capacity of around 10 mL are ideal. The test-tubes should be as clean as possible. Test-tubes, dropping pipettes and measuring cylinders should be washed in tap water and then rinsed with deionised or distilled water.
Procedure
Students 1 and 2
a Number the test-tubes 1–7.
b Half-fill test-tube 1 with the hydrochloric acid solution.
c Transfer 1 mL of the hydrochloric acid into the measuring cylinder. Add distilled or deionised water to the measuring cylinder, up to the 10 mL mark.
d Pour some of the resulting diluted solution from the measuring cylinder into test-tube 2, enough to come to a similar height as the solution in test-tube 1.
e Carefully, pour away all but 1 mL of the solution remaining in the measuring cylinder. Now add distilled or deionised water to the measuring cylinder up to the 10 mL mark. Pour the resulting solution into test-tube 3. Continue in this way until you have solutions in test-tubes 1 to 6. Put only distilled or deionised water into test-tube 7.
Students 3 and 4
f Repeat instructions a – e using the sodium hydroxide solution instead of hydrochloric acid. Number the test-tubes 8–13.
Both groups
g Put the two racks of test-tubes together so that the solutions are in order 1 to 13. The test-tubes now have solutions in them with pH 1 (test-tube 1) to pH 13 (test-tube 13).
h Add a drop of Universal indicator to each test-tube. Rock each test-tube from side to side to mix the contents. Add more Universal indicator solution to each test-tube if needed to allow the colours to be seen more clearly. Be sure to add the same number of drops of indicator to each test-tube.
i Compare the colors of the solutions with the pH indicator chart.
b Half-fill test-tube 1 with the hydrochloric acid solution.
c Transfer 1 mL of the hydrochloric acid into the measuring cylinder. Add distilled or deionised water to the measuring cylinder, up to the 10 mL mark.
d Pour some of the resulting diluted solution from the measuring cylinder into test-tube 2, enough to come to a similar height as the solution in test-tube 1.
e Carefully, pour away all but 1 mL of the solution remaining in the measuring cylinder. Now add distilled or deionised water to the measuring cylinder up to the 10 mL mark. Pour the resulting solution into test-tube 3. Continue in this way until you have solutions in test-tubes 1 to 6. Put only distilled or deionised water into test-tube 7.
Students 3 and 4
f Repeat instructions a – e using the sodium hydroxide solution instead of hydrochloric acid. Number the test-tubes 8–13.
Both groups
g Put the two racks of test-tubes together so that the solutions are in order 1 to 13. The test-tubes now have solutions in them with pH 1 (test-tube 1) to pH 13 (test-tube 13).
h Add a drop of Universal indicator to each test-tube. Rock each test-tube from side to side to mix the contents. Add more Universal indicator solution to each test-tube if needed to allow the colours to be seen more clearly. Be sure to add the same number of drops of indicator to each test-tube.
i Compare the colors of the solutions with the pH indicator chart.
Tuesday, February 21, 2017
Homework/Agenda for 2.22.17
Solutions (Chapter 15) test on Friday
Ice Cream making on Thursday
Bring (everybody)
Read
Chapter 16.1, pp 503 - 506
Do
Problems 7 b,d, 8 b,c, 9 b,d, 10 b,d
Ice Cream making on Thursday
Bring (everybody)
- 1 qt Ziplok bag
- 1 gal Ziplok bag
- spoons
Read
Chapter 16.1, pp 503 - 506
Do
Problems 7 b,d, 8 b,c, 9 b,d, 10 b,d
Friday, February 17, 2017
Homework due 2.21.17
Read
Chapter 15.10, pp 495 - 496
Do
Problems 50, 51, 59
Calculation of Freezing Point Depression
Chapter 15.10, pp 495 - 496
Do
Problems 50, 51, 59
Calculation of Freezing Point Depression
If the solution is treated as an ideal solution, the extent of freezing-point depression depends only on the solute concentration that can be estimated by a simple linear relationship with the cryoscopic constant ("Blagden's Law"):
- ΔTF = KF · b · i,
where:
- ΔTF, the freezing-point depression, is defined as TF (pure solvent) − TF (solution).
- KF, the cryoscopic constant, which is dependent on the properties of the solvent, not the solute. (Note: When conducting experiments, a higher KF value makes it easier to observe larger drops in the freezing point. For water, KF = 1.853 K·kg/mol.[7])
- b is the molality (moles solute per kilogram of solvent)
- i is the van 't Hoff factor (number of ion particles per individual molecule of solute, e.g. i = 2 for NaCl, 3 for BaCl2)
Thursday, February 16, 2017
Homework due 2.17.17
Homework
|
Read Chapter 15.8, 15.9, pp 488 - 495
Do Problems 39, 41b,d, 44b,c, 48, pg 501 |
Tuesday, February 14, 2017
Sunday, February 12, 2017
Homework due 2.14.17
Read
Chapter 15.5, pp 476 - 481
Do
Problems 21b, 21d, 22b, 22d, 26, 30, pg 500
Homework Harvest tomorrow on Chapter 10, 14.6, 14.7
Chapter 15.5, pp 476 - 481
Do
Problems 21b, 21d, 22b, 22d, 26, 30, pg 500
Homework Harvest tomorrow on Chapter 10, 14.6, 14.7
Friday, February 10, 2017
Wednesday, February 8, 2017
Homework due 2.10.17
[note: please start new chapter homework on new piece of binder paper.]
Read
Chapter 15.1, 15.2, 15.3 pp 467 - 473
Do
Problems 1, 2, 3, 5, 7, 10, 11 pg 499
Read
Chapter 15.1, 15.2, 15.3 pp 467 - 473
Do
Problems 1, 2, 3, 5, 7, 10, 11 pg 499
Monday, February 6, 2017
Homework due 2.7.17
Read
Chapter 14.6, 14.7 pp 454 - 461
Do
Questions 35, 37, 40, 41 pp 464 - 465
Multiple Choice Assessment on Chapter 10, 14 on Wednesday, Feb 8.
1 page of structured notes allowed. Must be turned into Mr. Gould no later than end-of-day Tuesday Feb. 7. Template to be distributed in class on Monday. Please contact Mr. Gould immediately if you are not at school on Monday.
Click here to download your own PDF of the Chapter 10+14 Study Guide Sheet
Chapter 14.6, 14.7 pp 454 - 461
Do
Questions 35, 37, 40, 41 pp 464 - 465
Multiple Choice Assessment on Chapter 10, 14 on Wednesday, Feb 8.
1 page of structured notes allowed. Must be turned into Mr. Gould no later than end-of-day Tuesday Feb. 7. Template to be distributed in class on Monday. Please contact Mr. Gould immediately if you are not at school on Monday.
Click here to download your own PDF of the Chapter 10+14 Study Guide Sheet
Friday, February 3, 2017
Homework due 2.6.17
Read
No new chapters! Just review as necessary.
Do
Critical Thinking Problems 61, 64 pp 320 - 321
You must show your work to get a stamp!
link to Hess's Law video
No new chapters! Just review as necessary.
Do
Critical Thinking Problems 61, 64 pp 320 - 321
You must show your work to get a stamp!
link to Hess's Law video
Thursday, February 2, 2017
Wednesday, February 1, 2017
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