April 22,2009

In today's class:
A.) Ms.K gave us 20 minutes or more to finish the questions from our Lab Sheet
B.) We went over the Questions 1-2 from Lesson 4 assignment (yellow sheets)
C.) Received Handouts
-Concentration versus time Graph
-Chapter 18 study guide (answer pages 1 to 3)

The following were the answers from Lesson 4 assignment:


1.For the reaction
PCl3(g) + Cl2(g) PCl5(g) ΔH = –92.5 kJ
predict the effect on the position of the equilibrium that results from

a) increasing the total pressure by decreasing volume. shift right
b) injecting more Cl2 gas without changing the volume. shift right
c) increasing the temperature. shift left (increasing the temperature tends to favour the endothermic reaction)
d) increasing the volume of the container. shift left
e) adding a catalyst. Adding a catalyst does not affect the equilibrium position

2.For the reaction
CH4(g) + H2O(g) + 49.3 kJ CO(g) + 3 H2(g)
predict the effect on the position of the equilibrium that results from

a) increasing temperature. shifts right (Increasing temperature favours the endothermic reaction)
b) decreasing temperature. shift to the left
c) decreasing the pressure.shifts equilibrium to the right
d) decreasing the volume of the container.shifting equilibrium to the left
e) adding a solid drying agent such as CaCl2 which reacts with H2O(g). shift towards the left


That's what we all did for today's class....
next scribe is Larlyn.....*_*

tue..feb 2

Hi! There…

First off, Ms.K. gave us a sheet entitled IDENTIFICATION OF UNKNOWN SOLUTION; this sheet explained the step by step process in identifying an unknown solution. Like....
Carefully observe the unknown solution (colour) .....
- Some Aqueous solutions can be recognize by their colours such as the Copper (blue),Chromium(green),iron( pale yellow) etc.
Observe according to their solubility.....
- This can be recognize by mixing the solution to other solutions, be sure to list the products or the outcome (whether they precipitate or not), this may be helpful in identifying the unknown compound.

After she went over the sheet, she let us to choose our partner and gave each pair a four different types of unknown solution (*different in each pair). And the only equipment that we’d used to identify the unknown solution are the following: spot plate, stir stick, a solubility chart and the solution themselves.

This experiment must be done meticulously to avoid any mistakes.....!*_*

All solutions were in dropper bottles, where you just need to add a few drops of an assign unknown solution from the dropper bottle to the plate. Observe if the solution precipitates or the colour changes(list your observation). Repeat the process from the rest, Remember that all the observation you came out with ,are very helpful in identifying the unknown solutions.

So,that's all for today........

the next scribe will be hmmmmm...Ramina!:>