AQA Chemistry GCSE C1 Higher - Unofficial Mark Scheme Period.
Atomic structure
What is atomic number? (1 mark)
The number of protons.
What is atomic mass? (1 mark)
Number of protons and neutrons.
Why is there no overall charge? (2 marks)
Same number of protons and electrons, balancing the charges.
Why is Chlorine and Fluorine in the same group? (2 marks)
Because they both have 7 electrons in the outer shell.
Identify the element (1 mark)
Sulphur.
Metal and non metals reacting would form particles called ions (1 mark)
Non metals reacting would form particles called molecules. (1 mark)
Limestone question
Thermal decomposition. (1 mark)
Alkali. (1 mark)
Water. (1 mark)
Carbonate (1 mark).
Mortar&Aggregate
Draw 2 lines of best fit. (2 marks)
Describe one way how they could improve the accuracy of the test? (2 mark)
Repeating the test, to calculate a mean. Improving accuracy of points on the graph.
Force required for 0 grams of aggregate (2 marks)
Had to extend the line of best fit to 0, which is 44 newtons.
Why is his conclusion wrong? (3 marks)
Because the force did increase up until reaching 400 grams of aggregate, however after 400 grams of aggregate used the force decreased with the mass of 500, 600, 700.
Atmosphere
Explain why there are many theories involving how simple life were formed? (1 mark)
Because there's no conclusive evidence supporting one theory.
6 marker on the atmosphere
-Volcanic activity released carbon dioxide and also water vapour in the air, increasing levels of both in the early atmosphere.
-Earth cooled, decreasing levels of water vapour, and forming oceans.
-Carbon dioxide dissolves in the oceans, decreasing levels of carbon dioxide.
-Plant life do photosynthesis decreasing levels of carbon dioxide in the air and also increase levels of oxygen.
Metals and their uses
Why do we need to do stage 1 which is separation ? (2 marks)
Because separation of the ore, means that the ore would now be more concentrated of that metal and therefore allowing it to be more economical.
Why is cast iron not used for over head cables? (1 mark)
Can rust easily.
How is cast iron formed? (2 marks)
Carbon is removed from molten iron by blowing oxygen into it. The oxygen reacts with the carbon, producing carbon monoxide and carbon dioxide, which escape from the molten metal. Enough oxygen is used to achieve steel with the desired carbon content.
Property of Aluminium (1 mark)
Low density
Transition metals and how can you tell copper is a transitional metal and not Aluminium. (3 marks?)
Aluminium is in group 3, and group 3 metals are not transitional metals. Copper is in the middle section of the periodic table where transitional metals are located.
Crude oil
Fractioning columns ( 4 marks)
Crude oil has a mixture of hydrocarbons.
Crude oil is vaporised.
Crude oil is condensed.
At different boiling points and collected.
Why is limestone suspension used and which environmental factor does it decrease? (3 marks)
Sulphur dioxide forming sulphuric acid reacting with the limestone as a neutralisation reaction, decreasing levels of sulphur dioxide in the air which as a result less acid rain.
Finish cracking (1 mark)
C2H4
Polymerisation drawing (3 marks)
Removal of double bond.
Adding a bond on the brackets. -()-
Smart polymer property (1 mark)
Shape memory.
Vegetable oils
Weird question poorly worded, since it was in reference for food and fuel.
Why are vegetable oils important? (1 mark)
Provide high energy.
2 main stages (2 marks)
-Crushed
-Oil removed by pressing or distillation.
One use of vegetable oil over than using water for cooking? (2 marks)
-Vegetable oil has a higher boiling point than water, this means that the food will be cooked at high temperatures so making it quicker.
-Different tastes
-Wider variety of flavours.
Emulsifier (4 marks)
-Hydrophilic head is attached to the water.
-Hydrophobic tail is attached to the oil.
-Stops separation of both liquids.
Full paper is here, surprised myself with the memory that was put into this. Be sure to rep this post. Hope you've done well, cheers <3.
What is atomic number? (1 mark)
The number of protons.
What is atomic mass? (1 mark)
Number of protons and neutrons.
Why is there no overall charge? (2 marks)
Same number of protons and electrons, balancing the charges.
Why is Chlorine and Fluorine in the same group? (2 marks)
Because they both have 7 electrons in the outer shell.
Identify the element (1 mark)
Sulphur.
Metal and non metals reacting would form particles called ions (1 mark)
Non metals reacting would form particles called molecules. (1 mark)
Limestone question
Thermal decomposition. (1 mark)
Alkali. (1 mark)
Water. (1 mark)
Carbonate (1 mark).
Mortar&Aggregate
Draw 2 lines of best fit. (2 marks)
Describe one way how they could improve the accuracy of the test? (2 mark)
Repeating the test, to calculate a mean. Improving accuracy of points on the graph.
Force required for 0 grams of aggregate (2 marks)
Had to extend the line of best fit to 0, which is 44 newtons.
Why is his conclusion wrong? (3 marks)
Because the force did increase up until reaching 400 grams of aggregate, however after 400 grams of aggregate used the force decreased with the mass of 500, 600, 700.
Atmosphere
Explain why there are many theories involving how simple life were formed? (1 mark)
Because there's no conclusive evidence supporting one theory.
6 marker on the atmosphere
-Volcanic activity released carbon dioxide and also water vapour in the air, increasing levels of both in the early atmosphere.
-Earth cooled, decreasing levels of water vapour, and forming oceans.
-Carbon dioxide dissolves in the oceans, decreasing levels of carbon dioxide.
-Plant life do photosynthesis decreasing levels of carbon dioxide in the air and also increase levels of oxygen.
Metals and their uses
Why do we need to do stage 1 which is separation ? (2 marks)
Because separation of the ore, means that the ore would now be more concentrated of that metal and therefore allowing it to be more economical.
Why is cast iron not used for over head cables? (1 mark)
Can rust easily.
How is cast iron formed? (2 marks)
Carbon is removed from molten iron by blowing oxygen into it. The oxygen reacts with the carbon, producing carbon monoxide and carbon dioxide, which escape from the molten metal. Enough oxygen is used to achieve steel with the desired carbon content.
Property of Aluminium (1 mark)
Low density
Transition metals and how can you tell copper is a transitional metal and not Aluminium. (3 marks?)
Aluminium is in group 3, and group 3 metals are not transitional metals. Copper is in the middle section of the periodic table where transitional metals are located.
Crude oil
Fractioning columns ( 4 marks)
Crude oil has a mixture of hydrocarbons.
Crude oil is vaporised.
Crude oil is condensed.
At different boiling points and collected.
Why is limestone suspension used and which environmental factor does it decrease? (3 marks)
Sulphur dioxide forming sulphuric acid reacting with the limestone as a neutralisation reaction, decreasing levels of sulphur dioxide in the air which as a result less acid rain.
Finish cracking (1 mark)
C2H4
Polymerisation drawing (3 marks)
Removal of double bond.
Adding a bond on the brackets. -()-
Smart polymer property (1 mark)
Shape memory.
Vegetable oils
Weird question poorly worded, since it was in reference for food and fuel.
Why are vegetable oils important? (1 mark)
Provide high energy.
2 main stages (2 marks)
-Crushed
-Oil removed by pressing or distillation.
One use of vegetable oil over than using water for cooking? (2 marks)
-Vegetable oil has a higher boiling point than water, this means that the food will be cooked at high temperatures so making it quicker.
-Different tastes
-Wider variety of flavours.
Emulsifier (4 marks)
-Hydrophilic head is attached to the water.
-Hydrophobic tail is attached to the oil.
-Stops separation of both liquids.
Full paper is here, surprised myself with the memory that was put into this. Be sure to rep this post. Hope you've done well, cheers <3.
(edited 8 years ago)
Scroll to see replies
For the question asking about what the atomic mass is, isn't the answer the number of protons + neutrons? Not the number of protons and electrons. And the two non-metals reacting form molecules, not atoms. Other than that, I hope the rest of the mark scheme is correct - thank you for putting it up!
Pretty sure they were talking about the stage 2 not stage 1 of extraction if metal ores...
Alot of this is completely wrong people so DO NOT TRUST THIS
Original post by timothygrealish
Alot of this is completely wrong people so DO NOT TRUST THIS
thats what im thinking
Original post by MoriartyLives
Pretty sure they were talking about the stage 2 not stage 1 of extraction if metal ores...
It was
I think it's molecules instead of atoms for the second(?) question
Original post by hope99
why did you have to draw two lines that touch? so if they don't touch you'd lose marks?i just drew two lines going in opposite direction but i didn't make them touch, oops
Same here. Dont worry
Original post by Decklan
Atomic structure
What is atomic number? (1 mark)
The number of protons.
What is atomic mass? (1 mark)
Number of protons and electrons.
Why is there no overall charge? (2 marks)
Same number of protons and electrons, balancing the charges.
Why is Chlorine and Fluorine in the same group? (2 marks)
Because they both have 7 electrons in the outer shell.
Identify the element (1 mark)
Sulphur.
Metal and non metals reacting would form particles called ions (1 mark)
Non metals reacting would form particles called atoms. (1 mark)
Limestone question
Thermal decomposition. (1 mark)
Alkali. (1 mark)
Water. (1 mark)
Carbonate (1 mark).
Mortar&Aggregate
Draw 2 lines that touch. (2 marks)
Describe one way how they could improve the accuracy of the test? (2 mark)
Make sure the concrete beam have the same contact surface on one block with the other block, ensuring a fair test.
Force required for 0 grams of aggregate (2 marks)
Had to extend the line of best fit to 0, which is 44 newtons.
Why is his conclusion wrong? (3 marks)
Because the force did increase up until reaching 400 grams of aggregate, however after 400 grams of aggregate used the force decreased with the mass of 500, 600, 700.
Atmosphere
Explain why there are many theories involving how simple life were formed? (1 mark)
Because there's no conclusive evidence supporting one theory.
6 marker on the atmosphere
-Volcanic activity released carbon dioxide and also water vapour in the air, increasing levels of both in the early atmosphere.
-Earth cooled, decreasing levels of water vapour, and forming oceans.
-Carbon dioxide dissolves in the oceans, decreasing levels of carbon dioxide.
-Plant life do photosynthesis decreasing levels of carbon dioxide in the air and also increase levels of oxygen.
Metals and their uses
Why do we need to do stage 1 which is separation ? (2 marks)
Because separation of the ore, means that the ore would now be more concentrated of that metal and therefore allowing it to be more economical.
Why is cast iron not used for over head cables? (1 mark)
Too soft.
How is cast iron formed? (2 marks)
4% carbon in the cast iron reacts with oxygen at high temperatures, forming carbon dioxide.
Property of Aluminium (1 mark)
Low density
Transition metals and how can you tell copper is a transitional metal and not Aluminium. (3 marks?)
Aluminium is in group 3, and group 3 metals are not transitional metals. Copper is in the middle section of the periodic table where transitional metals are located.
Crude oil
Fractioning columns ( 4 marks)
Crude oil has a mixture of hydrocarbons.
Crude oil is vaporised.
Crude oil is condensed.
At different boiling points and collected.
Why is limestone suspension used and which environmental factor does it decrease? (3 marks)
Sulphur dioxide forming sulphuric acid reacting with the limestone as a neutralisation reaction, decreasing levels of sulphur dioxide in the air.
Finish cracking (1 mark)
C2H4
Polymerisation drawing (3 marks)
Removal of double bond.
Adding a bond on the brackets. -()-
Smart polymer property (1 mark)
Shape memory.
Vegetable oils
Weird question poorly worded, since it was in reference for food and fuel.
Why are vegetable oils important? (1 mark)
Conservation of non renewable sources?
2 main stages (2 marks)
-Crushed
-Oil removed by pressing or distillation.
One use of vegetable oil over than using water for cooking? (2 marks)
Vegetable oil has a higher boiling point than water, this means that the food will be cooked at high temperatures so making it quicker.
Emulsifier (4 marks)
-Hydrophilic head is attached to the water.
-Hydrophobic tail is attached to the oil.
-Stops separation of both liquids.
Full paper is here, surprised myself with the memory that was put into this. Be sure to rep this post. Hope you've done well, cheers <3.
What is atomic number? (1 mark)
The number of protons.
What is atomic mass? (1 mark)
Number of protons and electrons.
Why is there no overall charge? (2 marks)
Same number of protons and electrons, balancing the charges.
Why is Chlorine and Fluorine in the same group? (2 marks)
Because they both have 7 electrons in the outer shell.
Identify the element (1 mark)
Sulphur.
Metal and non metals reacting would form particles called ions (1 mark)
Non metals reacting would form particles called atoms. (1 mark)
Limestone question
Thermal decomposition. (1 mark)
Alkali. (1 mark)
Water. (1 mark)
Carbonate (1 mark).
Mortar&Aggregate
Draw 2 lines that touch. (2 marks)
Describe one way how they could improve the accuracy of the test? (2 mark)
Make sure the concrete beam have the same contact surface on one block with the other block, ensuring a fair test.
Force required for 0 grams of aggregate (2 marks)
Had to extend the line of best fit to 0, which is 44 newtons.
Why is his conclusion wrong? (3 marks)
Because the force did increase up until reaching 400 grams of aggregate, however after 400 grams of aggregate used the force decreased with the mass of 500, 600, 700.
Atmosphere
Explain why there are many theories involving how simple life were formed? (1 mark)
Because there's no conclusive evidence supporting one theory.
6 marker on the atmosphere
-Volcanic activity released carbon dioxide and also water vapour in the air, increasing levels of both in the early atmosphere.
-Earth cooled, decreasing levels of water vapour, and forming oceans.
-Carbon dioxide dissolves in the oceans, decreasing levels of carbon dioxide.
-Plant life do photosynthesis decreasing levels of carbon dioxide in the air and also increase levels of oxygen.
Metals and their uses
Why do we need to do stage 1 which is separation ? (2 marks)
Because separation of the ore, means that the ore would now be more concentrated of that metal and therefore allowing it to be more economical.
Why is cast iron not used for over head cables? (1 mark)
Too soft.
How is cast iron formed? (2 marks)
4% carbon in the cast iron reacts with oxygen at high temperatures, forming carbon dioxide.
Property of Aluminium (1 mark)
Low density
Transition metals and how can you tell copper is a transitional metal and not Aluminium. (3 marks?)
Aluminium is in group 3, and group 3 metals are not transitional metals. Copper is in the middle section of the periodic table where transitional metals are located.
Crude oil
Fractioning columns ( 4 marks)
Crude oil has a mixture of hydrocarbons.
Crude oil is vaporised.
Crude oil is condensed.
At different boiling points and collected.
Why is limestone suspension used and which environmental factor does it decrease? (3 marks)
Sulphur dioxide forming sulphuric acid reacting with the limestone as a neutralisation reaction, decreasing levels of sulphur dioxide in the air.
Finish cracking (1 mark)
C2H4
Polymerisation drawing (3 marks)
Removal of double bond.
Adding a bond on the brackets. -()-
Smart polymer property (1 mark)
Shape memory.
Vegetable oils
Weird question poorly worded, since it was in reference for food and fuel.
Why are vegetable oils important? (1 mark)
Conservation of non renewable sources?
2 main stages (2 marks)
-Crushed
-Oil removed by pressing or distillation.
One use of vegetable oil over than using water for cooking? (2 marks)
Vegetable oil has a higher boiling point than water, this means that the food will be cooked at high temperatures so making it quicker.
Emulsifier (4 marks)
-Hydrophilic head is attached to the water.
-Hydrophobic tail is attached to the oil.
-Stops separation of both liquids.
Full paper is here, surprised myself with the memory that was put into this. Be sure to rep this post. Hope you've done well, cheers <3.
Thanks for the markscheme, but where did you get these answers from? I'm not sure about a few eg for the cast iron one,i think the question was about why isn't cast iron used for pylons not cables, but anyway i don't think it's too soft like you said because it's cast iron not pure iron; pure iron would be too soft but cast iron is brittle, so maybe that's why?
Original post by Decklan
Atomic structure
Describe one way how they could improve the accuracy of the test? (2 mark)
Make sure the concrete beam have the same contact surface on one block with the other block, ensuring a fair test.
-> I put about using smaller amounts of weights (e.g. going up by 50 grams each time versus 100 grams each time)?
Force required for 0 grams of aggregate (2 marks)
Had to extend the line of best fit to 0, which is 44 newtons.
-> This one was just... lol.. I put 60 newtons, I've seen some people put as low as 28...
Why do we need to do stage 1 which is separation ? (2 marks)
Because separation of the ore, means that the ore would now be more concentrated of that metal and therefore allowing it to be more economical.
-> Not sure about this one. Just said that that you can get rid of waste rock and what not. It was about stage 2 but still separation.
Why is cast iron not used for over head cables? (1 mark)
Can rust easily.
-> I put that the aluminium is stronger and so wouldn't move around so much?
Property of Aluminium (1 mark)
Low density
-> I think strong works too and a few others.
Why is limestone suspension used and which environmental factor does it decrease? (3 marks)
Sulphur dioxide forming sulphuric acid reacting with the limestone as a neutralisation reaction, decreasing levels of sulphur dioxide in the air.
-> I suppose here you can talk about any of the environmental factors, carbon dioxide, nitrous oxide etc.?
Smart polymer property (1 mark)
Shape memory.
-> Here I put that it's a polymer that responds to its environment like a wound dressing closing tighter in response to temperature, so I suppose any examples work here.
Vegetable oils
Weird question poorly worded, since it was in reference for food and fuel.
Why are vegetable oils important? (1 mark)
Conservation of non renewable sources?
-> As I said in my last post, I found this a bit weird but just put that they provide a lot of energy.
Describe one way how they could improve the accuracy of the test? (2 mark)
Make sure the concrete beam have the same contact surface on one block with the other block, ensuring a fair test.
-> I put about using smaller amounts of weights (e.g. going up by 50 grams each time versus 100 grams each time)?
Force required for 0 grams of aggregate (2 marks)
Had to extend the line of best fit to 0, which is 44 newtons.
-> This one was just... lol.. I put 60 newtons, I've seen some people put as low as 28...
Why do we need to do stage 1 which is separation ? (2 marks)
Because separation of the ore, means that the ore would now be more concentrated of that metal and therefore allowing it to be more economical.
-> Not sure about this one. Just said that that you can get rid of waste rock and what not. It was about stage 2 but still separation.
Why is cast iron not used for over head cables? (1 mark)
Can rust easily.
-> I put that the aluminium is stronger and so wouldn't move around so much?
Property of Aluminium (1 mark)
Low density
-> I think strong works too and a few others.
Why is limestone suspension used and which environmental factor does it decrease? (3 marks)
Sulphur dioxide forming sulphuric acid reacting with the limestone as a neutralisation reaction, decreasing levels of sulphur dioxide in the air.
-> I suppose here you can talk about any of the environmental factors, carbon dioxide, nitrous oxide etc.?
Smart polymer property (1 mark)
Shape memory.
-> Here I put that it's a polymer that responds to its environment like a wound dressing closing tighter in response to temperature, so I suppose any examples work here.
Vegetable oils
Weird question poorly worded, since it was in reference for food and fuel.
Why are vegetable oils important? (1 mark)
Conservation of non renewable sources?
-> As I said in my last post, I found this a bit weird but just put that they provide a lot of energy.
Just a few of my thoughts, what do you guys reckon? A few curve balls by AQA in there and their usually crappy wording of questions, but ho hum!
(edited 8 years ago)
Atomic structure
What is atomic number? (1 mark)
IT'S NUMBER OF ELECTRONS
PROTONS IS ON THE PERIODIC TABLE THEY GIVE, AND THERE WAS A SIMILAR QUESTION ON ANOTHER PAPER AND IT SAID DO NOT ACCEPT PROTONS IF I REMEMBER CORRECTLY
What is atomic mass? (1 mark)
Number of protons and electrons.
Why is there no overall charge? (2 marks)
Same number of protons and electrons, balancing the charges.
Why is Chlorine and Fluorine in the same group? (2 marks)
Because they both have 7 electrons in the outer shell.
Identify the element (1 mark)
Sulphur.
Metal and non metals reacting would form particles called ions (1 mark)
Non metals reacting would form particles called MOLECULES. (1 mark)
Limestone question
CALCIUM CARBONATE (1 mark)
THERMAL DECOMPOSTION (1 mark)
Water. (1 mark)
ALKALI (1 mark).
Mortar&Aggregate
Draw 2 lines that touch. (2 marks)
Describe one way how they could improve the accuracy of the test? (2 mark)
Make sure the concrete beam have the same contact surface on one block with the other block, ensuring a fair test.
Force required for 0 grams of aggregate (2 marks)
Had to extend the line of best fit to 0, which is 44 newtons.
Why is his conclusion wrong? (3 marks)
Because the force did increase up until reaching 400 grams of aggregate, however after 400 grams of aggregate used the force decreased with the mass of 500, 600, 700.
Atmosphere
Explain why there are many theories involving how simple life were formed? (1 mark)
Because there's no conclusive evidence supporting one theory.
6 marker on the atmosphere
-Volcanic activity released carbon dioxide and also water vapour in the air, increasing levels of both in the early atmosphere.
-Earth cooled, decreasing levels of water vapour, and forming oceans.
-Carbon dioxide dissolves in the oceans, decreasing levels of carbon dioxide.
-Plant life do photosynthesis decreasing levels of carbon dioxide in the air and also increase levels of oxygen.
Metals and their uses
Why do we need to do stage 1 which is separation ? (2 marks)
Because separation of the ore, means that the ore would now be more concentrated of that metal and therefore allowing it to be more economical.
Why is cast iron not used for over head cables? (1 mark)
Too soft.
How is cast iron formed? (2 marks)
4% carbon in the cast iron reacts with oxygen at high temperatures, forming carbon dioxide.
Property of Aluminium (1 mark)
Low density
Transition metals and how can you tell copper is a transitional metal and not Aluminium. (3 marks?)
Aluminium is in group 3, and group 3 metals are not transitional metals. Copper is in the middle section of the periodic table where transitional metals are located.
Crude oil
Fractioning columns ( 4 marks)
Crude oil has a mixture of hydrocarbons.
Crude oil is vaporised.
Crude oil is condensed.
At different boiling points and collected.
Why is limestone suspension used and which environmental factor does it decrease? (3 marks)
Sulphur dioxide forming sulphuric acid reacting with the limestone, decreasing levels of sulphur dioxide in the air, DECREASING THE AMOUNT OF ACID RAIN
Finish cracking (1 mark)
C2H4
Polymerisation drawing (3 marks)
Removal of double bond.
Adding a bond on the brackets. -()-
Smart polymer property (1 mark)
MALLEBALE, STRONG, LIGHT (YOU ONLY NEED ONE)
Vegetable oils
Weird question poorly worded, since it was in reference for food and fuel.
Why are vegetable oils important? (1 mark)
Conservation of non renewable sources?
2 main stages (2 marks)
-Crushed
-Oil removed by pressing
One use of vegetable oil over than using water for cooking? (2 marks)
Vegetable oil has a higher boiling point than water, this means that the food will be cooked at high temperatures so making it quicker.
Emulsifier (4 marks)
-Hydrophilic head is attached to the water.
-Hydrophobic tail is attached to the oil.
-Stops separation of both liquids.
I've done a few corrections.
What is atomic number? (1 mark)
IT'S NUMBER OF ELECTRONS
PROTONS IS ON THE PERIODIC TABLE THEY GIVE, AND THERE WAS A SIMILAR QUESTION ON ANOTHER PAPER AND IT SAID DO NOT ACCEPT PROTONS IF I REMEMBER CORRECTLY
What is atomic mass? (1 mark)
Number of protons and electrons.
Why is there no overall charge? (2 marks)
Same number of protons and electrons, balancing the charges.
Why is Chlorine and Fluorine in the same group? (2 marks)
Because they both have 7 electrons in the outer shell.
Identify the element (1 mark)
Sulphur.
Metal and non metals reacting would form particles called ions (1 mark)
Non metals reacting would form particles called MOLECULES. (1 mark)
Limestone question
CALCIUM CARBONATE (1 mark)
THERMAL DECOMPOSTION (1 mark)
Water. (1 mark)
ALKALI (1 mark).
Mortar&Aggregate
Draw 2 lines that touch. (2 marks)
Describe one way how they could improve the accuracy of the test? (2 mark)
Make sure the concrete beam have the same contact surface on one block with the other block, ensuring a fair test.
Force required for 0 grams of aggregate (2 marks)
Had to extend the line of best fit to 0, which is 44 newtons.
Why is his conclusion wrong? (3 marks)
Because the force did increase up until reaching 400 grams of aggregate, however after 400 grams of aggregate used the force decreased with the mass of 500, 600, 700.
Atmosphere
Explain why there are many theories involving how simple life were formed? (1 mark)
Because there's no conclusive evidence supporting one theory.
6 marker on the atmosphere
-Volcanic activity released carbon dioxide and also water vapour in the air, increasing levels of both in the early atmosphere.
-Earth cooled, decreasing levels of water vapour, and forming oceans.
-Carbon dioxide dissolves in the oceans, decreasing levels of carbon dioxide.
-Plant life do photosynthesis decreasing levels of carbon dioxide in the air and also increase levels of oxygen.
Metals and their uses
Why do we need to do stage 1 which is separation ? (2 marks)
Because separation of the ore, means that the ore would now be more concentrated of that metal and therefore allowing it to be more economical.
Why is cast iron not used for over head cables? (1 mark)
Too soft.
How is cast iron formed? (2 marks)
4% carbon in the cast iron reacts with oxygen at high temperatures, forming carbon dioxide.
Property of Aluminium (1 mark)
Low density
Transition metals and how can you tell copper is a transitional metal and not Aluminium. (3 marks?)
Aluminium is in group 3, and group 3 metals are not transitional metals. Copper is in the middle section of the periodic table where transitional metals are located.
Crude oil
Fractioning columns ( 4 marks)
Crude oil has a mixture of hydrocarbons.
Crude oil is vaporised.
Crude oil is condensed.
At different boiling points and collected.
Why is limestone suspension used and which environmental factor does it decrease? (3 marks)
Sulphur dioxide forming sulphuric acid reacting with the limestone, decreasing levels of sulphur dioxide in the air, DECREASING THE AMOUNT OF ACID RAIN
Finish cracking (1 mark)
C2H4
Polymerisation drawing (3 marks)
Removal of double bond.
Adding a bond on the brackets. -()-
Smart polymer property (1 mark)
MALLEBALE, STRONG, LIGHT (YOU ONLY NEED ONE)
Vegetable oils
Weird question poorly worded, since it was in reference for food and fuel.
Why are vegetable oils important? (1 mark)
Conservation of non renewable sources?
2 main stages (2 marks)
-Crushed
-Oil removed by pressing
One use of vegetable oil over than using water for cooking? (2 marks)
Vegetable oil has a higher boiling point than water, this means that the food will be cooked at high temperatures so making it quicker.
Emulsifier (4 marks)
-Hydrophilic head is attached to the water.
-Hydrophobic tail is attached to the oil.
-Stops separation of both liquids.
I've done a few corrections.
(edited 8 years ago)
Original post by metrize
Wasnt the element oxygen
No i thought that at first too. But the element had 16 electrons. And since the electrons and protons are the same, it had 16 protons. Sulfur has 16 as it's atomic number.
This paper was great! Apart from the weirdly worded questions it's seemed to go smoothly. I think I got about 56
Original post by varun1212
No i thought that at first too. But the element had 16 electrons. And since the electrons and protons are the same, it had 16 protons. Sulfur has 16 as it's atomic number.
There goes my a*
Original post by timothygrealish
Alot of this is completely wrong people so DO NOT TRUST THIS
Original post by moe889
thats what im thinking
Yes, some of it IS wrong, but at least it shows all the questions clearly
the OP is just a GCSE student, so can't be expected to get everything correct immediately
incorrect answers will probably be changed ^-^
Original post by timothygrealish
Alot of this is completely wrong people so DO NOT TRUST THIS
Oh yea? What's that Tim?
Quick Reply
Related discussions
- GCSE Exam Discussions 2024
- Aqa gcse biology paper 2 mark scheme 2023
- mark scheme biology 2022 gcse combined science higher paper 1
- AQA GCSE Biology Paper 1 Foundation Tier [16th May 2023] Exam Chat
- AQA GCSE Chemistry Paper 1 Higher Tier (8462 1H) - 22nd May 2023 [Exam Chat]
- Gcse biology aqa exam paper 1 2023
- Please help
- How do stay on topic in the French GCSE 150 word question?
- Academic comeback gyg 2024 🎀
- GCSE Exam Discussions 2023
- AQA Chem Unit 1 May 22nd 2015 *OFFICIAL THREAD*
- Have primrose kitten predicted papers been accurate?
- gcse biology combined aqa 2023
- REVISION - Y10 (GCSEs)
- AQA A-level Biology 7402 - Paper 2 - 13th June 2019
- Edexcel GCSE Chemistry (Paper 1)
- Biology Paper 1 - PRACTICE exam paper (with mark scheme) INVALUABLE resource
- GCSE Results Day Countdown - 24th August 2023 TODAY - #BeResultsProud!
- revision help :(
- chemistry
Latest
Trending
Last reply 2 days ago
OCR A-LEVEL CHEMISTRY A PAPER 2 (H432/02) - 21st June [Exam Chat]Last reply 1 week ago
AQA A-Level Chemistry Paper 2 (7405/2) - 18th June 2024 [Exam Chat]Last reply 1 week ago
AQA A-Level Chemistry Paper 1 (7405/1) - 10th June 2024 [Exam Chat]Last reply 2 weeks ago
AQA GCSE Chemistry Paper 1 Higher Tier Triple (8462 1H) - 17th May 2024 [Exam Chat]Last reply 2 weeks ago
OCR A-LEVEL CHEMISTRY PAPER 1 (H432/01) - 10th June [Exam Chat]Posted 2 weeks ago
AQA GCSE Chemistry Paper 1 (Foundation Combined) 8464/1F - 17th May 2024 [Exam Chat]Posted 2 weeks ago
AQA GCSE Chemistry Paper 2 (Foundation Combined) 8464/2F - 11th June 2024 [Exam Chat]Posted 2 weeks ago
AQA GCSE Chemistry Paper 2 Higher Tier Triple (8462 2H) - 11th June 2024 [Exam Chat]Posted 2 weeks ago
AQA GCSE Chemistry Paper 1 Foundation Triple (8462 1F) - 17th May 2024 [Exam Chat]Posted 3 weeks ago
Edexcel GCSE Combined Science Paper 5 Chem 2 Foundation - 11th June 2024 [Exam Chat]Posted 3 weeks ago
Edexcel GCSE Combined Science Paper 2 Chem 1 Foundation - 17th May 2024 [Exam Chat]Last reply 2 months ago
Edexcel GCSE Combined Sci Paper 2 Higher Tier (1SC0 2CH) - 13th Jun 2023 [Exam Chat]Trending
Last reply 2 days ago
OCR A-LEVEL CHEMISTRY A PAPER 2 (H432/02) - 21st June [Exam Chat]Last reply 1 week ago
AQA A-Level Chemistry Paper 2 (7405/2) - 18th June 2024 [Exam Chat]Last reply 1 week ago
AQA A-Level Chemistry Paper 1 (7405/1) - 10th June 2024 [Exam Chat]Last reply 2 weeks ago
AQA GCSE Chemistry Paper 1 Higher Tier Triple (8462 1H) - 17th May 2024 [Exam Chat]Last reply 2 weeks ago
OCR A-LEVEL CHEMISTRY PAPER 1 (H432/01) - 10th June [Exam Chat]Posted 2 weeks ago
AQA GCSE Chemistry Paper 1 (Foundation Combined) 8464/1F - 17th May 2024 [Exam Chat]Posted 2 weeks ago
AQA GCSE Chemistry Paper 2 (Foundation Combined) 8464/2F - 11th June 2024 [Exam Chat]Posted 2 weeks ago
AQA GCSE Chemistry Paper 2 Higher Tier Triple (8462 2H) - 11th June 2024 [Exam Chat]Posted 2 weeks ago
AQA GCSE Chemistry Paper 1 Foundation Triple (8462 1F) - 17th May 2024 [Exam Chat]Posted 3 weeks ago
Edexcel GCSE Combined Science Paper 5 Chem 2 Foundation - 11th June 2024 [Exam Chat]Posted 3 weeks ago
Edexcel GCSE Combined Science Paper 2 Chem 1 Foundation - 17th May 2024 [Exam Chat]Last reply 2 months ago
Edexcel GCSE Combined Sci Paper 2 Higher Tier (1SC0 2CH) - 13th Jun 2023 [Exam Chat]
