Complete the following basic quiz to check your knowledge in chemical equilibrium and Le Chatlier’s Principle
How to import quizzes into Bright space
In this video I will show you how to import questions from Exam View, if you already were using the program to create tests and quizzes. There is no need to retype question into Bright space. It is easier to import all the questions with the right formatting, well if you enjoy creating quizzes which is not importable into any other program, then this is not for you. 😉
Updating Mark book Cloud From Database Text File
Here is a short video that shows you how to create a class in Mark book Cloud and update the student list for the data base file provided by the institution. https://www.markbookapp.com
If you just need to see how to update the class list watch this shorter video
Covid-19 Precautions
Restarting school requires that all teachers and students follow appropriate safety protocols. Here is a short introduction to what is expected. Watch all the videos, to familiarize with the protocols.
Synchronous Lessons
Lessons will be delivered using Brightspace. In order to access your course log into AW and under resources the drop down menu you will find the link to Brightspace.
Areas of technology you should be familiar with is
- Brightspaces from D2L
- Google Classroom
- Google Drive
- Google Ca lenders
- Office 365 – Create an account with Microsoft education with your student email account to obtain a free download of the suite
If you are in my class you are already enrolled. Get familiar navigating the different sections which is done mostly by the top menu. All your lessons, assignments, videos etc. can be located under “Contents”
Bright space learning environment for learners
Skills needed to navigate remote learning
- Use Microsoft office
- Create word documents
- Export word documents as pdf files
- Edit pdf files with Adobe acrobat
- Use of PowerPoint
- Create jpeg or png image files for embedding in your documents
- Use of Excel for graphing
How to pair Apple keyboard with Windows 10
Pairing apple keyboard with windows 10
Pairing your apple keyboard with windows 10 is easy, but quite a number of times you would have experienced frustration. Here is what I found that works.
Go to settings > Device > Add Bluetooth or other device > Select the name of your device.
In this case your Apple Keyboard >
At this time press the button on the opposite end of the battery ( or Command + W) compartment and the Green light flickers.
A number appears on the screen enter it immediately on the apple keyboard and pairing should be complete. If you do not do this right away a couple of times, you will get a new prompt where you will prompted to enter a PIN. Do not worry, you will now enter a number which is the new PIN
Now immediately on the Apple keyboard enter the same number quickly and hit enter. Your keyboard will pair instantly. This works all the time.
Online Remote Lessons
Online-Remote Lessons
There is a new reality we are facing in this unprecedented circumstance. Due to social distancing, remote – online lessons or distance learning is the new reality. Online-Remote lessons for SCH4U, can be accessed from this site. Google meet based virtual learning will be held as and when required, for the virtual classes.
More information for the courses can be obtained from the following links
Preparation of Osazone
Preparation of Osazone
To confirm the presence of carbohydrate during the analysis of an organic compound, the best way would be the preparation of osazone from the original organic compound given to you.
Chemicals and Equipment’s
- 0.5 grams of carbohydrates or sugar
- 0.4 grams of phenyl hydrazibe hydrochloride
- 0.6 grams of of crystalline sodium acetate
- 50 mL pyrex test tube or a suitable test tube perferably pyrex or borosil.
- 400 mL beaker to prepare a water bath
- A water heater electric or bunsen burner
- Wire gauze if using the bunsen burner
- A tripod stand if using the bunsen burner.
Procedure
In order to prepare the compound, first you need to set up the water bath using a 400 mL beaker that is filled with about 300 mL water.
Now dissolve 0.4 grams of phenyl hydrazine and 0.6 grams of crystalline sodium acetate in 4 or 5 mL of distilled water.
Add this mixture to 0.5 grams of sugar dissolved in 3 or 4 mL of distilled water. Loosely close the test tube with a stopper to hold the reagents. Now place the test tube in the hot water bath, with gentle stirring or agitation. The time taken for the osazone to appear is a sure sign of the type of sugar used. Once the precipitation of the osazone is complete, filter the precipitate and recrystallize the osazone from 50% alcohol
Estimation of Copper as Copper (1) thiocyanate Gravimetry
Estimation of Copper as Copper(1)Thiocyanate Gravimetry
Estimation of Copper as Copper (1) Thiocyanate Gravimetry
Determination of the amount of copper in a solution of Copper(II)sulphate.
This can be achieved by precipitating copper as copper(I)thiocyanate and massing the precipitated copper(I)thiocyanate, hence this is a gravimetric estimation.
2CuSO4 + 2NH4CNS + 2H2O + SO2 => 2CuCNS + (NH4) 2SO4 + H2SO4
Transfer the given copper(II)sulphate solution to a 100 mL volumetric flask, 20 mL of this solution is pipetted into a 250 mL Erlenmeyer flask. Add about 5 mL of 1 M H2SO4, followed by about 25 to 30 mL of H2SO3 which has been freshly prepared, by passing SO2 though distilled water. This solution is diluted to about 150 mL and heated to boiling. Add about 10 mL of 10 % NH4CNS in small quantities to the warm solution with constant stirring. The NH4CNS should be in excess. As the limiting reagent is the Copper(II) ions.
When the copper(I)thiocyanate is precipitated the solution should be colourless, if not use more ammonium thiocyanate, at this time the solution still should have the odour of sulfur dioxide.
After 24 hours the solution is filtered through a previously washed cleaned, dried and weighed sintered glass crucible (IG-4). The precipitate is washed 10 to 15 times. Add 1 mL of 10 % ammoniumsulphocyanide (NH4CNS) and 5 drops of saturated sulphurous acid to 100 mL of distilled water, cool it and use this liquid for washing the precipitate. Once this is done the final washing is done several times using 20% ethanol to remove the ammonium thiocyanate. The precipitate is dried at 110 to 120 oC for an hour, the precipitate is cooled and massed as CuCNS. The process of heating cooling and weighing until the mass remains constant.
Calculation
Mass of CuCNS = x grams
Mass 1 mole of CuCNS = 121.54g/mol
1 Mole of CuCNS contains 63.54 grams of copper
‘y’ = Mass of copper = 63.54/121.54 * (x mass of CuCNS)
Since we had taken 20 mL of the copper ion solution the total mass of copper(II) present in the solution provided is y*5
Things to note
H2SO3 is used to reduce Cu2+ to Cu+
Keep the pH low to reduce the solubility of the precipitate
Excess ammonium thiocyanate would help in complexing copper ions so should be avoided
Estimation of Magnesium ions in water using EDTA
Estimation of Magnesium ions in water using EDTA
The principle on which the titration lab is based:
The reaction between Mg2+ ions and EDTA can be represented like this.
Mg2+ + H2Y2- → MgY2- + 2H+
Prepare a standard solution of magnesium sulfate and titrate it against the given EDTA solution using Eriochrome Black T as the indicator. A buffer solution is prepared for maintaining the pH of about 10. When the reaction is complete all the magnesium ions would have been complexed with EDTA and the free indicator would impart a blue color to the solution. Estimation of magnesium ions using edta.
Procedure:
Preparation of 0.025M MgSO4.7H2O: Dissolve 0.616 grams of analytic grade magnesium sulfate into a 100 mL volumetric flask. Dissolve the salt completely using distilled or de-ionized water.
Standardization of EDTA: 20 mL of the standard magnesium sulfate solution is pipetted out into a 250 mL Erlenmeyer flask and diluted to 100 mL . Add 2 mL of a buffer solution of pH 10. Add 4 drops of Eriochrome Black T to the solution. The solution is warmed to 40 degrees C and titrated against EDTA taken in the burette. At the end point the color changes from wine red to blue. Repeat titrations for concordant values.
Estimation of magnesium ions in the given sample: 20 mL of the given sample of solution containing magnesium ions is pipetted into a 250 Erlenmeyer flask, the solution is diluted to 100 mL, warmed to 40 degrees C, 2 mL of a buffer solution of pH 10 is added followed by 4 drops of Eriochrome black T solution. The solution is titrated against the standardized EDTA solution. Repeat the titrations to obtain concordant values. The end point is the color change from red to blue.
Using the volumes of solutions used, their determined molarity, you will be able to calculate the amount of magnesium in the given sample of water.
This is how you can perform an estimation of magnesium using edta.