Chemistry

To Our Leaving Cert Chemistry Students...

2009-06-10T14:15:00.003+01:00

Folks, just to let you know that I will be accompanying you all during each day of your exams in my prayers. Over the past years we have learned much, experienced much and shared much.

Now I continuously pray that "the Helper, the Holy Spirit will teach you everything and will remind you of all I have said to you." Jn14:26

Electrochemistry Revision Slides

2009-05-10T18:40:00.000+01:00

Please download the slides on electrochemistry as they will be presented in class on Monday along with the rest of the electrochemistry option.

Once you understand the workings of the simple cell and know the electrochemical series then the procedures given are common sense and they are nothing more that a description of the movement of electrons through a system causing 2 chemical reactions one at the anode and the other at the cathode.

The option we will study simply describes some industrial applications of electrochemistry. These will be given to you on handouts.

Chromatography Videos

2009-03-05T20:15:00.000Z

To see how each of the various chromatographic techniques are employed, I have added some videos of paper, thin layer, column, gas and high performance liquid chromatography which I would urge you to view.

Paper Chromatography
Thin Layer Chromatography
Column Chromatography
Gas Chromatography
High Performance Liquid Chromatography

There are two other instrumental techniques that need to be studied IR and UV Spectrometry. These two videos explain both techniques completely.

IR Spectrometry

UV Spectrometry

LC Chemistry Mock Exam 2009

2009-01-29T19:55:00.000Z

Having reviewed the mock paper that you will sit next week, I have decided that it is only fair that I should alert you to the questions that as yet are still uncovered. I do not want you to waste any time entertaining questions that you simply cannot answer.

You have enough of your course covered now to allow a choice of 8 questions from the 11 offered.

All three practicals offered in Section A have already been covered. You may answer all three but must answer at least two.

Please remember the following:

1. Watch the marking scheme. Usually given in multiples of 3. Think of 3 marks representing one piece of information. Therefore a question offering 9 marks will require 3 points of information. (Not the same information given in three different ways so be careful!!)

2. Try in as far as is possible to accompany your answers with good sized pencil drawn labelled diagrams. Don't wait to be asked for a diagram. "Explain with the aid of a diagram..." means that you must give your answer in points of information and back them up with a diagram.

3. Chemistry questions can be answered in point form. Essay style answers are to be avoided at all costs!

4. Most of the more difficult chemical equations studied will be given on the paper. You must know how to read chemical equations and how to extract important information from them.

5. The only way you can get 0 marks is by leaving a blank space. Try everything!

5. We are not finished the course and we have not entertained any serious in-class revision of earlier topics yet so whilst the mocks serve a purpose they are not the end of the world.

As promised I have uploaded the solutions to all questions that are to be found in the workbook and in the textbook. They are in the 6th year folder and are simply called 'Tbook' and 'Wbook'.

Questions to be avoided.

Q7 (c)

Q10 (a) and (c)

Q11 (b) and (c)

This leaves you able to do all the following 8 questions: Q's 1,2,3,4,5,6,8,9.

You may choose to put any three parts from Q7(a), Q7(b), Q10(b) and Q11(a) together to make up another question if you should so wish. Do not hesitate to contact me by email on 'chemistry(at)knocklyoncs(dot)ie' if you have any questions regarding the exam or any questions on the subject matter as you are revising. I will do my very best to contact you with the solutions or the information you require.

Best of Luck!

Mr. O'Neill

5th Chem - Boyle's Law and Charles' Law

2009-01-26T09:29:00.000Z

Please study the following animations of each law in order to understand the results of the work of these two scientists.

Boyle's Law - Animation

Charles' Law - Animation

Both of these laws give their own unique constant and the two used in the combined gas law gives its own unique constant.

Great Chem Website

2009-01-12T09:56:00.000Z

For great revision cards and animation please visit the following site:
http://www.chemmybear.com/

5th Year Chemistry - Trends on the Periodic Table

2008-12-14T18:35:00.000Z

The slides used in class are now available to download from the 'Box' on the right. They have been enhanced by a few videos that I think you will enjoy!

Anion Tests - Virtual Lab

2008-12-01T09:40:00.001Z

In order to test your understanding of the experiment we have just finished i.e. the qualitative tests for common anions there is a java simulation available to rerun the tests without having the chemicals.

Please visit http://www.bpreid.com/applets/anions.html and make sure you have java enabled on your computer!

Enjoy!

5th Year Revision Test

2008-10-06T22:00:00.000+01:00

There will be a 25 minute revision test on Tuesday 7th of October at 3.10pm. The contents covered will include chapters 1 to 4 of your chemistry book with great emphasis on the chapter we have just completed.

Review all definitions, instrumental analysis and sample calculations with reference to isotopes of elements.

Know the history behing the structure of the Periodic Table.

6th Year Revision Test on Redox Titrations

2008-10-06T21:57:00.000+01:00

We have now completed all four mandated practicals in this area. You will have a 25 minute revision test on Thursday morning 9th of October at 9am. Please go over the past state exam questions on this topic and be very familiar with experimental procedure and titration calculations.

6th Year: The Reox Titration between Iodine and Thiosulphate

2008-09-28T17:39:00.001+01:00

This is the third of our four redox titrations.

The data sheet for the reaction is available in the box on the right in the 6th Year folder. It should be downloaded and studied before you attempt the titration.

There is a slight 'twist' to this titration in that we initially titrate the red/brown solution of iodine to a pale yellow with thiosulphate. A few drops of a fresh starch solution is then added which turns the solution blue/black. The titration is continued until there is a colour change from blue/black to colourless.

We cannot judge with our eyes when the pale yellow turns colourless so we use starch as an indicator.

Again you may begin this expt as soo as you enter the lab on Monday afternoon. All chemicals will be on the side bench.

6th Year Redox Titration: Manganate Vs Iron

2008-09-14T21:11:00.000+01:00

This expt for 6th year students will take place on Tuesday afternoon. It is important that you download the theory sheet called "Oxidation Titration" shown on the right and study it before attempting the titration.

Please also revise how to do titration calculations. You would have covered this in 5th year.

When you enter class on Tuesday afternoon, please go about setting up immediately as I plan to do a worked example of a full calculation after the experiment before we finish the lesson.

You may run a simulation of the experiment by visiting the following link: Redox Titration

5th Year Chemistry - Electronic Structure of the Atom - Class Slides

2008-09-09T21:22:00.000+01:00

I have decided this time to place the slides on electronic structure of the atom up on the site for you to download before we finish the chapter. This will make your continued study easier and will help you to prepare for the coming classes.

5th Year Chemistry - Atomic Theory 1 - Class Slides

2008-09-05T19:21:00.001+01:00

The first set of slides for ATOMIC THEORY 1 are now available to download. They are in the box on the right of this screen. Please download them and read them from your computer. If you wish you may print them out and file them away for your later revision.

I have also uploaded a short movie showing the effect of a hand-held magnet on cathode rays. Do have a look at it.

If you have any difficulties running the movie or any of the different animations on the slides just let me know in class on Monday.

Mr. O'Neill