Edexcel iGCSE Chemistry 1C 18th May 2017 very unofficial markscheme
🤑🌟Unofficial Markscheme🌟🤑
(Some of these are probably wrong as all of this is from memory😂😬)
Q1) {Atom of Lithium)
What is the atomic number?
A: 3
How many shells?
A: 2
What is the mass?
A: 7
How many protons are in an isotope?
A: 3
What group?
A:1
Q2) {Multiple choice}
Which is a molecule of an element?
A: H2
Which is a mixture?
A: NaCl in solution
How can you separate food dye?
A: Chromotography
{NaCl in water}
How do you test for chloride ions?
A: add nitric acid, then silver nitrate, white ppt forms
How does it get to the top?
A: Diffusion
{Label equipment}
A: Flask, Column, Condensation
{Change of state}
A: (g) > (l)
Q3) {Galvanising}
How do you coat iron with zinc?
A: Galvanising
What is the brown solid?
A: Rust
What is needed for the brown solid to form?
A: Oxygen and water
Use the symbols to describe how C doesnt rust.
A: Zn> Zn2+ & 2e-, 2e- & Fe2+ > Fe
Zinc is more reactive than Iron
Q4) {Table}
CuCl2, FeCl3, NH4Cl
CuCO3, Fe2(CO3)2, (NH4)2CO3
CuSO4, Fe2(SO4)3, (NH4)2SO4
Which is correct?
A: (C) Copper (II) Sulfate
Which is correct?
A: (C) White, colourless
Which is correct for Iron (III)?
A: (A) Brown ppt
What compounds are formed?
A: Sodium sulfate & Iron (III) Hydroxide
Why do you add HCl?
A: To remove carbonate ions
Observation with Barium Chloride (Barium Sulfate formed)
A: White ppt
How do you test for Carbonates?
A: add HCl, bubble gas through limewater, turns cloudy
Q5) Blast Furnace
Why is C + O2 > CO2 useful?
A: Creates heat
Why is CO2 + C > 2CO useful?
A: CO is needed to reduce iron ore
Give the chemical equations for the word equations.
A: CaCO3 > CaO + CO2
A: CaO + SiO2 > CaSiO3
Why is it described as a redox reaction?
Iron loses oxygen (reduction), Carbon gains oxygen (oxidation), happen simultaneously = redox reaction
Q6) {Hydrocarbons}
General formula for alkenes?
A: CnH2n
What products are formed in reaction 1?
A: Propene and Methane
Draw the saturated compound from reaction 2?
A: Ethane=
H H
HCCH
H H
Draw isomers.
A: C4H8
(1) H H H H
C=C- C- C- H
H H H
(2) H H H
H- C- C= C- C- H
H H H
Cracking Table.
A: Fe is a catalyst (Wrong)
Good because there are demands for different lengths (Right)
Cracking is from long to short (Right)
(cant remember rest)
Polymers-3 differences between reactants and products.
A: Ethene is: Shorter chain, has a double bond, is a gas.
Q7) {Iron & Oxygen}
Why is the iron powdered?
A: Reaction happens quicker, bigger SA to V ratio
Why is water necessary?
A: To create rust from the iron
Before, after, difference table.
A: 71-16 =55
Why is the volume lower?
A: (D) used less iron
Why is the student wrong?
A: Didnt include volume of flask etc
Find the value for the volume of O2 in air
A: 70 x 100 / 340 = 20.5%
Q8) {Hydrogen Iodide}
Draw the energy level diagram for the reaction with a catalyst.
A: Arch drawn below existing arch; shows lower activation energy
Label enthpy charge.
A: Arrow/line drawn from reactants line to products line labed delta H
Label Ecat
A: Arrow/line drawn from reactants line to where the top of your drawn arch is, labeled Ecat
What would the effect on RoR be if the temp was 400C?
A: Decreases
What would the effect be on yield of HI?
A: Increase, because exothermic
What would the effect on RoR be if the pressure was 2atm?
A: Decreases
What would the effect be on yield of HI?
A: No change, same moles on both side
Q9) {Halogens}
(Table)
A: can be separated from metal halides using electrolysis (Right)
Get lighter down the table (Wrong)
They form pairs of molecules (Right)
The boiling point decreases as you go down (Wrong)
They react with non metals covalently (Right)
They're all gases at room temp (Wrong)
(there's one more but cant't remember :/)
Multiple Choice: what colour does the solution go?
A: Darker (brown)
Methylbenzene and magnesium question.
A: HCl doesn't dissociate in methylbenzene but when water is added H+ ions are released making the solution acidic which reacts with magnesium (fizzing and magnesium disappears)
Why is reaction 2 useless?
A: Its a reaction between Cl and Cl so nothing would happen/doesnt compare different halogens
Displacement reaction between Astatine and Chlorine.
A: 2At- + Cl2 > At2 + 2Cl-
Why is this described as redox?
Chlorine is reduced, Astatine is oxidised
Q10) {Magnesium Compounds}
What happens when Magnesium burns in oxygen?
A: Magnesium burns with a bright white light, MgO is formed (white solid)
What happens when you burn the gas produced by reaction 2?
A: Squeaky pop
Why is the solution heated?
A: Remove water or make sure all the magnesium has reacted and to increase the solubility of the acid? (not very sure)
Why did the student dip the glass rod in the solution? (wtf)
A: To see if any crystals form on the rod so we know the solution is saturated
Give the formulae of what goes through the filtering paper
A: H2O, then either H2SO4 or Mg2SO4 (we arent sure)
State what the student did wrong
It should be 'sea of delocalised electrons'
It should all be labelled protons (the bigger molecules)
Water of crystallisation calculation
Water = 8.9/18 = 0.5 moles
MgSO4 = 8.3/120 = 0.07 moles
X= 0.5/0.07= 7
Q11) {Calcium Compounds}
Why is CO2 + CaOH neutralisation?
A: CO2 is acidic and CaOH is basic
Calculate how many H2O is needed to react with 28kg of Calcium Oxide.
A: Moles of Calcium Oxide = 28000/56 = 500
1 to 1 ratio
Moles of H2O = 500 X 18 = 9000g = 9kg
Draw the graph.
A:Negative Slope
Why does the rate increase with the temperature?
A: Greater proportion of particles with energy more than or equal to the activation energy required by the reaction, due to this there is a larger proportion of successful collisions occuring thus the rate of the reaction will increase. (copied from r.amudi)
That's all we can remember if you have anything to add please say
💫THE END💫
(Some of these are probably wrong as all of this is from memory😂😬)
Q1) {Atom of Lithium)
What is the atomic number?
A: 3
How many shells?
A: 2
What is the mass?
A: 7
How many protons are in an isotope?
A: 3
What group?
A:1
Q2) {Multiple choice}
Which is a molecule of an element?
A: H2
Which is a mixture?
A: NaCl in solution
How can you separate food dye?
A: Chromotography
{NaCl in water}
How do you test for chloride ions?
A: add nitric acid, then silver nitrate, white ppt forms
How does it get to the top?
A: Diffusion
{Label equipment}
A: Flask, Column, Condensation
{Change of state}
A: (g) > (l)
Q3) {Galvanising}
How do you coat iron with zinc?
A: Galvanising
What is the brown solid?
A: Rust
What is needed for the brown solid to form?
A: Oxygen and water
Use the symbols to describe how C doesnt rust.
A: Zn> Zn2+ & 2e-, 2e- & Fe2+ > Fe
Zinc is more reactive than Iron
Q4) {Table}
CuCl2, FeCl3, NH4Cl
CuCO3, Fe2(CO3)2, (NH4)2CO3
CuSO4, Fe2(SO4)3, (NH4)2SO4
Which is correct?
A: (C) Copper (II) Sulfate
Which is correct?
A: (C) White, colourless
Which is correct for Iron (III)?
A: (A) Brown ppt
What compounds are formed?
A: Sodium sulfate & Iron (III) Hydroxide
Why do you add HCl?
A: To remove carbonate ions
Observation with Barium Chloride (Barium Sulfate formed)
A: White ppt
How do you test for Carbonates?
A: add HCl, bubble gas through limewater, turns cloudy
Q5) Blast Furnace
Why is C + O2 > CO2 useful?
A: Creates heat
Why is CO2 + C > 2CO useful?
A: CO is needed to reduce iron ore
Give the chemical equations for the word equations.
A: CaCO3 > CaO + CO2
A: CaO + SiO2 > CaSiO3
Why is it described as a redox reaction?
Iron loses oxygen (reduction), Carbon gains oxygen (oxidation), happen simultaneously = redox reaction
Q6) {Hydrocarbons}
General formula for alkenes?
A: CnH2n
What products are formed in reaction 1?
A: Propene and Methane
Draw the saturated compound from reaction 2?
A: Ethane=
H H
HCCH
H H
Draw isomers.
A: C4H8
(1) H H H H
C=C- C- C- H
H H H
(2) H H H
H- C- C= C- C- H
H H H
Cracking Table.
A: Fe is a catalyst (Wrong)
Good because there are demands for different lengths (Right)
Cracking is from long to short (Right)
(cant remember rest)
Polymers-3 differences between reactants and products.
A: Ethene is: Shorter chain, has a double bond, is a gas.
Q7) {Iron & Oxygen}
Why is the iron powdered?
A: Reaction happens quicker, bigger SA to V ratio
Why is water necessary?
A: To create rust from the iron
Before, after, difference table.
A: 71-16 =55
Why is the volume lower?
A: (D) used less iron
Why is the student wrong?
A: Didnt include volume of flask etc
Find the value for the volume of O2 in air
A: 70 x 100 / 340 = 20.5%
Q8) {Hydrogen Iodide}
Draw the energy level diagram for the reaction with a catalyst.
A: Arch drawn below existing arch; shows lower activation energy
Label enthpy charge.
A: Arrow/line drawn from reactants line to products line labed delta H
Label Ecat
A: Arrow/line drawn from reactants line to where the top of your drawn arch is, labeled Ecat
What would the effect on RoR be if the temp was 400C?
A: Decreases
What would the effect be on yield of HI?
A: Increase, because exothermic
What would the effect on RoR be if the pressure was 2atm?
A: Decreases
What would the effect be on yield of HI?
A: No change, same moles on both side
Q9) {Halogens}
(Table)
A: can be separated from metal halides using electrolysis (Right)
Get lighter down the table (Wrong)
They form pairs of molecules (Right)
The boiling point decreases as you go down (Wrong)
They react with non metals covalently (Right)
They're all gases at room temp (Wrong)
(there's one more but cant't remember :/)
Multiple Choice: what colour does the solution go?
A: Darker (brown)
Methylbenzene and magnesium question.
A: HCl doesn't dissociate in methylbenzene but when water is added H+ ions are released making the solution acidic which reacts with magnesium (fizzing and magnesium disappears)
Why is reaction 2 useless?
A: Its a reaction between Cl and Cl so nothing would happen/doesnt compare different halogens
Displacement reaction between Astatine and Chlorine.
A: 2At- + Cl2 > At2 + 2Cl-
Why is this described as redox?
Chlorine is reduced, Astatine is oxidised
Q10) {Magnesium Compounds}
What happens when Magnesium burns in oxygen?
A: Magnesium burns with a bright white light, MgO is formed (white solid)
What happens when you burn the gas produced by reaction 2?
A: Squeaky pop
Why is the solution heated?
A: Remove water or make sure all the magnesium has reacted and to increase the solubility of the acid? (not very sure)
Why did the student dip the glass rod in the solution? (wtf)
A: To see if any crystals form on the rod so we know the solution is saturated
Give the formulae of what goes through the filtering paper
A: H2O, then either H2SO4 or Mg2SO4 (we arent sure)
State what the student did wrong
It should be 'sea of delocalised electrons'
It should all be labelled protons (the bigger molecules)
Water of crystallisation calculation
Water = 8.9/18 = 0.5 moles
MgSO4 = 8.3/120 = 0.07 moles
X= 0.5/0.07= 7
Q11) {Calcium Compounds}
Why is CO2 + CaOH neutralisation?
A: CO2 is acidic and CaOH is basic
Calculate how many H2O is needed to react with 28kg of Calcium Oxide.
A: Moles of Calcium Oxide = 28000/56 = 500
1 to 1 ratio
Moles of H2O = 500 X 18 = 9000g = 9kg
Draw the graph.
A:Negative Slope
Why does the rate increase with the temperature?
A: Greater proportion of particles with energy more than or equal to the activation energy required by the reaction, due to this there is a larger proportion of successful collisions occuring thus the rate of the reaction will increase. (copied from r.amudi)
That's all we can remember if you have anything to add please say
💫THE END💫
(edited 6 years ago)
Scroll to see replies
Original post by Humza101t
How did u find the paper?
It was hard. Thanks for the mark scheme. What about the calculation questions
Let's try and correct this mark scheme and get it as accurate as possible. Upvote the post so we can get more people working on it.
The answer to the last question was that there was a greater proportion of particles with energy more than or equal to the activation energy required by the reaction, due to this there is a larger proportion of successful collisions occuring thus the rate of the reaction will increase.
Original post by Tatsien
Iron was not a catalyst for cracking! Right?
your right we put an X infront of it
Original post by Tatsien
Iron was not a catalyst for cracking! Right?
Nah it wasn't. x
You must have a great memory!
For one of the questions, I think you remembered wrong though, you said 'The boiling point increases as you go down (Right)' but I think the question was the boing point decreases as you go down, which is wrong.
I'm not 100% sure though, does anyone else know?
I'm not 100% sure though, does anyone else know?
Original post by r.amudi
The answer to the last question was that there was a greater proportion of particles with energy more than or equal to the activation energy required by the reaction, due to this there is a larger proportion of successful collisions occuring thus the rate of the reaction will increase.
You just re-stated what was in the instructions :/ I think the correct answer is for the other reason is because it was an endothermic reaction, since bonds are broken, so more energy can be absorbed from its surroundings, breaking the bonds easier, therefore having a faster rate if reaction.
Original post by lucamarchal
Let's try and correct this mark scheme and get it as accurate as possible. Upvote the post so we can get more people working on it.
True let's get as many people to help. Need to know my estimate mark. I'm desperate for an A*
Original post by JMR2017
For one of the questions, I think you remembered wrong though, you said 'The boiling point increases as you go down (Right)' but I think the question was the boing point decreases as you go down, which is wrong.
I'm not 100% sure though, does anyone else know?
I'm not 100% sure though, does anyone else know?
I agree, the question said "the boiling point decreases as you go down", which is incorrect
Original post by Tatsien
You just re-stated what was in the instructions :/ I think the correct answer is for the other reason is because it was an endothermic reaction, since bonds are broken, so more energy can be absorbed from its surroundings, breaking the bonds easier, therefore having a faster rate if reaction.
That may be correct but I'm pretty sure r.amudi is right as well; the particles themselves have more energy so when they collide so they are more likely to have more energy than the activiation energy meaning that there are more successful collisions, increasing the rate of reaction.
The reason in the question instructions was that the particles have more energy so they more around faster so they collide MORE OFTEN (that is different to doing so with enough energy for the reaction to be successful).
For suggestions, write them here: https://docs.google.com/document/d/1ZW594UT6EpDHWwxcW8RNfYRh87igW5CJqQLYYFvUzc4/edit
Original post by Tatsien
You just re-stated what was in the instructions :/ I think the correct answer is for the other reason is because it was an endothermic reaction, since bonds are broken, so more energy can be absorbed from its surroundings, breaking the bonds easier, therefore having a faster rate if reaction.
That's what I put and I think it's correct.
Original post by JMR2017
You must have a great memory!
we were surprised at how much we remembered😂 probably a lot of missing questions tho😕🤑
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