Answers for the last test will be up tonight. Test 4 is on separating techniques
Standard test can be downloaded by clicking the following links
>> Page 1
>> Page 2
Extended test can be downloaded by clicking these links (It's a long one)
>>Page 1
>>Page 2
>>Page 3
>>Page 4
Tuesday, May 31, 2005
Friday, May 27, 2005
Test a day 3 - Atomic Structure and bonding
Todays test is on Atomic Structure and bonding.
Download, print out and take the standard test and extended test by clicking the following links. Each test should take half an hour. As usual, notes will be uploaded onto the forum.
>>Standard test page 1
>>Standard test page 2
>>Extended Test
Note: The extended test has been squeezed onto one page but it's dimensions are a bit funny so you may need to do some tweaking to get it to print out properly.
Good luck!
Download, print out and take the standard test and extended test by clicking the following links. Each test should take half an hour. As usual, notes will be uploaded onto the forum.
>>Standard test page 1
>>Standard test page 2
>>Extended Test
Note: The extended test has been squeezed onto one page but it's dimensions are a bit funny so you may need to do some tweaking to get it to print out properly.
Good luck!
Wednesday, May 25, 2005
Test-a-day day 1 answers uploaded
Answers to the Elements, compounds and mixtures test uploaded
>> Click here to download answers for standard test
>> Click here to download answers to extended test
Todays test for download is on the periodic table. Markscheme will be up tomorrow.
>> Periodic table test page 1
>> Periodic table test page 2
This test should take you half an hour and shouldn't cause anyone too many problems. A more difficult test on periodic table is the following one, which looks more at the patterns in the periodic table and the relationship between the place in the periodic table and properties of the elements. The following, extended test can be downloaded and done and should take you half an hour again.
Extended test
>> Page 1
>> Page 2
As usual, revision notes will be up on the forum website
Good luck!
>> Click here to download answers for standard test
>> Click here to download answers to extended test
Todays test for download is on the periodic table. Markscheme will be up tomorrow.
>> Periodic table test page 1
>> Periodic table test page 2
This test should take you half an hour and shouldn't cause anyone too many problems. A more difficult test on periodic table is the following one, which looks more at the patterns in the periodic table and the relationship between the place in the periodic table and properties of the elements. The following, extended test can be downloaded and done and should take you half an hour again.
Extended test
>> Page 1
>> Page 2
As usual, revision notes will be up on the forum website
Good luck!
Tuesday, May 24, 2005
Test a Day test 1 - Elements Compounds, Mixtures and changes of state
An easy one for starters, just some simple definitions and changes of state to get you in the mood.
The test is 7 questions long and worth 30 Marks. Start whenever you're ready and extra notes and exercises can be found on the forum. Most of these notes come from the scanned revision guides that I have been offering all of you, of which I now have Chemistry and Physics guides. As always the offer is open to burn you a copy if you bring me a blank CD. Answers will be posted tomorrow to allow you to mark for yourself.
The extended test is also uploaded - the answers to this test will take longer to come out though.
Elements, compounds, mixtures and changes in state test
Page 1
Page 2
Extended Test
Page 1
Page 2
Once you've marked it why not gloat on the forum about how excellent your mark was and maybe we can start a league table....
Phoenix
The test is 7 questions long and worth 30 Marks. Start whenever you're ready and extra notes and exercises can be found on the forum. Most of these notes come from the scanned revision guides that I have been offering all of you, of which I now have Chemistry and Physics guides. As always the offer is open to burn you a copy if you bring me a blank CD. Answers will be posted tomorrow to allow you to mark for yourself.
The extended test is also uploaded - the answers to this test will take longer to come out though.
Elements, compounds, mixtures and changes in state test
Page 1
Page 2
Extended Test
Page 1
Page 2
Once you've marked it why not gloat on the forum about how excellent your mark was and maybe we can start a league table....
Phoenix
Structured daily revision workout regime launch
Can't work out how to revise? Stuck for ideas? Do you find you can only really get yourself psyched up for a test by taking other tests? Then what you need is...
The Phoenix Test a Day Scheme!
Clinically proven to expand your brain and improve your confidence, this series of easy daily exercises will help you become the man (or woman if you're a if you're female. Or strange) that you've always wanted to be!
The idea is simple. Every day from now until your exam, a new test will be posted on this very site. The daily test can be downloaded and printed off and should take no more than half an hour to complete. The next day the answers will go up and you can check what you got. The marks are out of 30 every time.
Extra relevant helpsheets and exercises will also be uploaded aas necessary and these should be done before the test is attempted to give yourself as good a chance as you can.
The test should take half an hour and if you do half an hour a day this should put you in great stead for the exam. A further, harder test may also be uploaded on the same topic and if you find that neither test worries you unduly then you'll most likely breeze through the end of year exam. The further test should also take half an hour. One hours revision a day will almost certainly ensure you top marks.
Well good luck then Year 9. Your first test will be uploaded after this post...
Phoenix
PS - you may also want to check out the Physics website, same address but with "phys" instead of "chem" if you do physics. Same scheme operating over there.
The Phoenix Test a Day Scheme!
Clinically proven to expand your brain and improve your confidence, this series of easy daily exercises will help you become the man (or woman if you're a if you're female. Or strange) that you've always wanted to be!
The idea is simple. Every day from now until your exam, a new test will be posted on this very site. The daily test can be downloaded and printed off and should take no more than half an hour to complete. The next day the answers will go up and you can check what you got. The marks are out of 30 every time.
Extra relevant helpsheets and exercises will also be uploaded aas necessary and these should be done before the test is attempted to give yourself as good a chance as you can.
The test should take half an hour and if you do half an hour a day this should put you in great stead for the exam. A further, harder test may also be uploaded on the same topic and if you find that neither test worries you unduly then you'll most likely breeze through the end of year exam. The further test should also take half an hour. One hours revision a day will almost certainly ensure you top marks.
Well good luck then Year 9. Your first test will be uploaded after this post...
Phoenix
PS - you may also want to check out the Physics website, same address but with "phys" instead of "chem" if you do physics. Same scheme operating over there.
Mistake in Calculations Markscheme
If you've downloaded it already the Markscheme for the calculations test had a mistake in quesytion 8 - the answers for 8 are as follows
a)0.5 moles
b)0.2 moles
c)0.0625 moles
a)0.5 moles
b)0.2 moles
c)0.0625 moles
Thursday, May 19, 2005
Monday test 3 - Separating techniques and identifying substances
Next weeks Monday test covers two topics, separating chemicals and Identifying substances.
The first part, separating substances covers sections 2 and 7, the experimental techniques section on the checklist uploaded, so will include filtration, distillation and chromatography.
The second part is mainly section 10, analysis, and covers identification of ions and chemicals given their states and properites under certain conditions.
Revision notes will be uploaded onto the forum under the correct topic heading. Feel free to add your own notes up there too.
Good luck!
The first part, separating substances covers sections 2 and 7, the experimental techniques section on the checklist uploaded, so will include filtration, distillation and chromatography.
The second part is mainly section 10, analysis, and covers identification of ions and chemicals given their states and properites under certain conditions.
Revision notes will be uploaded onto the forum under the correct topic heading. Feel free to add your own notes up there too.
Good luck!
Calculations test answers uploaded
The answers to the calculations test has been uploaded in Word and can be downloaded by clicking on this link
>> Calculations test answers
>> Calculations test answers
Tuesday, May 17, 2005
A story about rabbits
One day there was a rabbit, who lived in a burrow. He was a very clever rabbit and very popular too because he had many carrots, which he would always share with his rabbit friends.
For years, Mr Rabbit had been delivered all the carrots he needed, but one day, he looked in his store and realised that he didn’t have quite enough carrots.
“What must I do?”, thought the clever young rabbit to himself, as he rubbed the furry bit between his floppy ears. Mr Rabbit had never before needed to worry about his carrot supply.
In a flash, it came to him. Mr Rabbit, a keen student of far eastern philosophy had on his wall a plaque which read:
“Give a man a fish, and you feed him for a day.
Teach a man to fish and you feed him forever”
“I don’t like fish, “ thought he wistfully “but I do like carrots. I will learn to hunt carrots in the wild”
With this thought in mind, Mr Rabbit made his way to the local rabbit university, where he enrolled in course C4RR0T5, “Advanced Carrot capture and torture techniques for rabbits”
While enrolled on the course, Mr Rabbit made many friends and his teachers thought he was wonderful as he seemed to have so many carrots. His project marks were outstanding, as Mr Rabbit was never short of a carrot to hand in. Mr Rabbit was achieving the most outstanding grades the teachers at UCRBIT had ever seen and his work was the talk of all rabbitdom.
But things were not all as they seemed.
Not a single carrot handed in as a project had been Mr Rabbits own work.
The term was nearly at its end and Mr Rabbit’s supply of carrots was nearly exhausted. Every project he handed in was a carrot from his own stores.
Every day, Mr Rabbit would have less and less to eat, but his marks were staying constantly high. The other rabbits still thought he was a genius carrot-catcher, despite the fact he had not ensnared a single carrot in a single trap all year. While the other rabbits toiled with medieval devices, from the car-ROTATOR to the Looping Nail-a-pult with sometimes disastrous results, Mr Rabbit was still no better educated than when he had first entered the class.
The other rabbits, on hearing of Mr Rabbits skills, were now coming over to feast on carrot pie with broccoli gravy every weekend. Mr Rabbit’s carrot and coriander soup was legendary.
The end of term came and the final exam loomed on the horizon. Mr Rabbits storeroom was empty and his chances of passing the final examination with narry a vegetable to his name was slim.
Mr Rabbit failed his final exams and now people laugh when they think of how pathetic he really was. Here was a bright young rabbit with so much potential, whose only sin was to want to be seen to be clever.
While the other rabbits may have failed the small tests, Mr Rabbit never did appreciate the value of that plaque on his wall.
For years, Mr Rabbit had been delivered all the carrots he needed, but one day, he looked in his store and realised that he didn’t have quite enough carrots.
“What must I do?”, thought the clever young rabbit to himself, as he rubbed the furry bit between his floppy ears. Mr Rabbit had never before needed to worry about his carrot supply.
In a flash, it came to him. Mr Rabbit, a keen student of far eastern philosophy had on his wall a plaque which read:
“Give a man a fish, and you feed him for a day.
Teach a man to fish and you feed him forever”
“I don’t like fish, “ thought he wistfully “but I do like carrots. I will learn to hunt carrots in the wild”
With this thought in mind, Mr Rabbit made his way to the local rabbit university, where he enrolled in course C4RR0T5, “Advanced Carrot capture and torture techniques for rabbits”
While enrolled on the course, Mr Rabbit made many friends and his teachers thought he was wonderful as he seemed to have so many carrots. His project marks were outstanding, as Mr Rabbit was never short of a carrot to hand in. Mr Rabbit was achieving the most outstanding grades the teachers at UCRBIT had ever seen and his work was the talk of all rabbitdom.
But things were not all as they seemed.
Not a single carrot handed in as a project had been Mr Rabbits own work.
The term was nearly at its end and Mr Rabbit’s supply of carrots was nearly exhausted. Every project he handed in was a carrot from his own stores.
Every day, Mr Rabbit would have less and less to eat, but his marks were staying constantly high. The other rabbits still thought he was a genius carrot-catcher, despite the fact he had not ensnared a single carrot in a single trap all year. While the other rabbits toiled with medieval devices, from the car-ROTATOR to the Looping Nail-a-pult with sometimes disastrous results, Mr Rabbit was still no better educated than when he had first entered the class.
The other rabbits, on hearing of Mr Rabbits skills, were now coming over to feast on carrot pie with broccoli gravy every weekend. Mr Rabbit’s carrot and coriander soup was legendary.
The end of term came and the final exam loomed on the horizon. Mr Rabbits storeroom was empty and his chances of passing the final examination with narry a vegetable to his name was slim.
Mr Rabbit failed his final exams and now people laugh when they think of how pathetic he really was. Here was a bright young rabbit with so much potential, whose only sin was to want to be seen to be clever.
While the other rabbits may have failed the small tests, Mr Rabbit never did appreciate the value of that plaque on his wall.
Monday, May 16, 2005
Monday test 3 - Calculations and the mole - test uploaded
The test on calculations has been uploaded - answers to follow.
The calculations test can be downloaded by clicking on the following links
>>Test paper page 1
>>Test paper page 2
The calculations test can be downloaded by clicking on the following links
>>Test paper page 1
>>Test paper page 2
Sunday, May 15, 2005
Monday test 3 - Calculations and the mole
You were warned on Wednesday. I can tell you it's devilishly hard!
Word on the exam is that you have 2 papers, one which is a combination of papers 1 and 6 so that will be multichoice and practical, and another that is a combination of papers 2 and 3 which are the knowledge papers, core and extended. I have no information on when the exact exams will be.
Word on the exam is that you have 2 papers, one which is a combination of papers 1 and 6 so that will be multichoice and practical, and another that is a combination of papers 2 and 3 which are the knowledge papers, core and extended. I have no information on when the exact exams will be.
Tuesday, May 10, 2005
Monday test 2 - Acids, bases and salts
Some good results in for the second test, but many of you need to learn titrations and precipitations. The main question that you fell down on was the one about titration using Hydrochloric and Sulphuric Acid.
As both of these are strong acids, they disociate to the same extent i.e. they both completely split up releasing their hydrogen ions. The question says that both acids are of the same concentration. If you look at the formula for Hydrochloric Acid and the Formula for Sulphuric acid, you can see that when Sulphuric Acid breaks up, it releases 2 Hydrogen ions as it's H2SO4. Hydrochloric Acid only gives out one when it disociates.
Therefore if you use sulphuric rather than hydrochloric acid you only require HALF the volume as it supplies twice as many hydrogen ions.
The test paper can be found by clicking on the following links
Page 1
Page 2
The Mark scheme can be found by clicking on this link
Mark Scheme
As both of these are strong acids, they disociate to the same extent i.e. they both completely split up releasing their hydrogen ions. The question says that both acids are of the same concentration. If you look at the formula for Hydrochloric Acid and the Formula for Sulphuric acid, you can see that when Sulphuric Acid breaks up, it releases 2 Hydrogen ions as it's H2SO4. Hydrochloric Acid only gives out one when it disociates.
Therefore if you use sulphuric rather than hydrochloric acid you only require HALF the volume as it supplies twice as many hydrogen ions.
The test paper can be found by clicking on the following links
Page 1
Page 2
The Mark scheme can be found by clicking on this link
Mark Scheme
Sunday, May 08, 2005
Calculation of water of crystallization
To recreate the experiment done in class and for a little more help with calculating water of crystallization, click on the interactive web lab at http://oldmanhonda.com/Chemistry/WebLabs/Hydrate/Hydrate.html where you can do the experiment and use a specially made web lab calculator to perform all calculations for this experiment.
Saturday, May 07, 2005
Extra revision from 2 of the best books I've read - Acids bases and salts
Extra revision notes have been posted on the forum under the title Acids, bases and salts. Any further resources I find will be posted up on the forum under the appropriate title. The threads are available for anyone to post up any useful revision notes and links on. If you've got a good idea or resource, why not share it.
Forum can be found at http://phoenixscience.proboards38.com/index.cgi
Forum can be found at http://phoenixscience.proboards38.com/index.cgi
Wednesday, May 04, 2005
Topic to revise for Monday single lesson test 2
The topic tested next week will be Acids, bases and salts. This can be found mostly on chapter 7. More information and revision will be posted here shortly
Tuesday, May 03, 2005
Monday Revision test 1 – Solubility - Test and mark scheme
Our test on Monday was drawn from some past paper questions on solubility. These questions were variously gathered from past papers, including some paper 1, 2 and 6 and were designed to test your knowledge on solubility from different angles.
The results you got from this test will tell you how much you know and how much you need to learn. To help you fill in the gaps I’ve posted the paper here and the mark scheme, complete with comments on where most of you dropped marks.
Test paper
Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Mark Scheme
Click and save
Importantly there are a few major gaps I picked up, where all of you are slipping up.
The first is to do with the formation of crystals from solution.
We made quite a few crystals during Acids, bases and salts, and during that unit I tried to get you to make sure that the crystals were made properly.
When making crystals from a solution there are some stages we must follow
Filter our mixture to remove any excess residue that has not reacted. Usually our salts are made by adding a compound or metal to an acid. Let’s take Magnesium and Hydrochloric acid for example. What is left in the filter paper is any magnesium that has not reacted. The salt that is made remains in solution (Magnesium chloride) to go through the filter paper
In order to get the Magnesium Chloride (MgCL2) out of solution we have to evaporate it. SLOWLY. This is NOT in order to make big crystals (although it is true that the slower the crystals are cooled the bigger the crystals made) but it is in order to make crystals AT ALL
The solution that gets through the filter (the filtrate) is heated on a low flame until crystals are seen to form around the top of the solution. Then take it OFF the flame and leave it to evaporate.
Explanation
I didn’t teach you this the first time round as it’s not in the syllabus but now that we’ve finished the syllabus we’ll do a practical on this on Sunday.
Crystals are often held together by water. This so-called “Water of crystallisation” is loosely bonded to the molecules of the crystal and this loose bonding can be seen in the formula for example in the question on Page 3 of the test. MgSO4.7H2O shows that each MgSO4 molecule is surrounded by 7 water molecules.
These water molecules can be removed quite easily by heating the crystal, which causes the crystal to break down to powder Magnesium Sulphate, releasing the water as steam.
In Sunday’s lesson we will see the effect that heating away the water of crystallisation has on Copper Sulphate crystals.
If we heat the crystals too much the water of crystallisation evaporates and we don’t make crystals at all.
The reason we heat it is to speed up the process of evaporation, but we don’t want to heat it too far.
Ideally, we want to evaporate off enough water to leave us with a warm, saturated solution. As we know, warm water holds more solute than cold. If we can make a warm saturated solution, when it cools down the crystals in solution will crystallise out, with enough available water to hold the crystals together.
The results you got from this test will tell you how much you know and how much you need to learn. To help you fill in the gaps I’ve posted the paper here and the mark scheme, complete with comments on where most of you dropped marks.
Test paper
Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Mark Scheme
Click and save
Importantly there are a few major gaps I picked up, where all of you are slipping up.
The first is to do with the formation of crystals from solution.
We made quite a few crystals during Acids, bases and salts, and during that unit I tried to get you to make sure that the crystals were made properly.
When making crystals from a solution there are some stages we must follow
Filter our mixture to remove any excess residue that has not reacted. Usually our salts are made by adding a compound or metal to an acid. Let’s take Magnesium and Hydrochloric acid for example. What is left in the filter paper is any magnesium that has not reacted. The salt that is made remains in solution (Magnesium chloride) to go through the filter paper
In order to get the Magnesium Chloride (MgCL2) out of solution we have to evaporate it. SLOWLY. This is NOT in order to make big crystals (although it is true that the slower the crystals are cooled the bigger the crystals made) but it is in order to make crystals AT ALL
The solution that gets through the filter (the filtrate) is heated on a low flame until crystals are seen to form around the top of the solution. Then take it OFF the flame and leave it to evaporate.
Explanation
I didn’t teach you this the first time round as it’s not in the syllabus but now that we’ve finished the syllabus we’ll do a practical on this on Sunday.
Crystals are often held together by water. This so-called “Water of crystallisation” is loosely bonded to the molecules of the crystal and this loose bonding can be seen in the formula for example in the question on Page 3 of the test. MgSO4.7H2O shows that each MgSO4 molecule is surrounded by 7 water molecules.
These water molecules can be removed quite easily by heating the crystal, which causes the crystal to break down to powder Magnesium Sulphate, releasing the water as steam.
In Sunday’s lesson we will see the effect that heating away the water of crystallisation has on Copper Sulphate crystals.
If we heat the crystals too much the water of crystallisation evaporates and we don’t make crystals at all.
The reason we heat it is to speed up the process of evaporation, but we don’t want to heat it too far.
Ideally, we want to evaporate off enough water to leave us with a warm, saturated solution. As we know, warm water holds more solute than cold. If we can make a warm saturated solution, when it cools down the crystals in solution will crystallise out, with enough available water to hold the crystals together.
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