what about the last question on why does conductivity decrease:

i put the oxygen reacts with the delocalised electrons, therefore there ar eless delocalised electrons to carry the charge hence lower conductivity

Reply 84

osama2

how many marks would i get for the two reasons for when it said "why doesnt it matter that the yield is low".
1, fast process so they produce a lot of ammonia daily
2, hydrogen and nitrogen are reused back in the process

how many marks?

Reply 85

Chlomc

All the questions i can remember, theyre not in the right order and the answers im not sure about i havnt put in. but its a starting point :L

How would the results be made more percise? (1)
Giving data to 3dp rather than 2dp
Calculate the mean average for these results? (2)
Give to examples of experimental errors that could have been made? (2)
Why is it important to repeat each experiment? (1)
To get more reliable accurate results
Diagram you had to complete of N and Cl covanetly bonded together
What kind of bonding is this? (1)
Covalent bonding
Diamond are very hard, why is this. Include information on the bonding and structure of diamonds? (3)
Giant covalent bond
Particles tight together
Strong intermolecular forces
What does a precipitate recation mean?
A solid is produced
How would you get the (solid product - cant remember the name :L) seperate?
evaporation
Filtration (1)
What happens in the seperator?
Why is stage 4 needed?
If heat energy applied to this rection decreases then the amount of amonia made increases, why is this? (1)
Because its an exothermic reaction
The manu factorers increase the pressure to (high number) why dont they go over this? (1)
What is the percentage of amonia made from the possible amount? (1)
15%
Why does it not matter that its a low percentage made?
Because the unreacted nitrogen and hydrogen are recyled to go through the process again.
Explain the structure and bonding of gold? (3)
Metalic bonding
Overlapping outter shell of electrons
Delocalised electrons
Electrostatic forces
Tightly packed together particles
Why is gold a good conducture of electricity? (2)
Delocalised eclectrons
Electrons from outter shells have pathways through whole metal structure
Iron surface corrodes when exposed to air, this reduces its ability to conduct, explain why? (2)
If there is 20m of nitrogen how much hydrogen would you need?
how much ammonia could you make with 2g of nitrogen?
Why when pressure is increase does the amount of ammonia increase?
Complete this equation Ca = Ca2+ + ?
Ca = Ca2++ 2e-
Why is this described as oxidation?
Electrons are lost
Please add and contribute!

(edited 11 years ago)

Reply 86

jdudley

Original post by daniya12

i put it that the costs are low as sources are readily available, and that the reaction was fairly quick.
not sure if its right though

I put that becuase its a reversible reaction, it could just be reused becuase and sent back to the start of the process.

Reply 87

Chlomc

Original post by daniya12

Thats pretty much what i put! I hope its right

Original post by daniya12

i though this was easier tbh?

I found it hard ;L.......... I already think i lost more than 10 marks

Reply 90

Aidanb90

Original post by Chlomc

All the questions i can remember, theyre not in the right order and the answers im not sure about i havnt put in. but its a starting point :L

How would the results be made more percise? (1)
Giving data to 3dp rather than 2dp
Calculate the mean average for these results? (2)
Give to examples of experimental errors that could have been made? (2)
Why is it important to repeat each experiment? (1)
To get more reliable accurate results
(Picture of covalent boning) What kind of bonding is this? (1)
Covalent bonding
Diamond are very hard, why is this. Include information on the bonding and structure of diamonds? (3)
Giant covalent bond
Particles tight together
Strong intermolecular forces
What does a precipitate recation mean?
How would you get the (solid product - cant remember the name :L) seperate?
evaporation (1)
What happens in the seperator?
Why is stage 4 needed?
If heat energy applied to this rection decreases then the amount of amonia made increases, why is this? (1)
Because its an exothermic reaction
The manu factorers increase the pressure to (high number) why dont they go over this? (1)
What is the percentage of amonia made from the possible amount? (1)
15%
Why does it not matter that its a low percentage made?
Because the unreacted nitrogen and hydrogen are recyled to go through the process again.
Explain the structure and bonding of gold? (3)
Metalic bonding
Overlapping outter shell of electrons
Delocalised electrons
Electrostatic forces
Tightly packed together particles
Why is gold a good conducture of electricity? (2)
Delocalised eclectrons
Electrons from outter shells have pathways through whole metal structure
Iron surface corrodes when exposed to air, this reduces its ability to conduct, explain why? (2)

Please add and contribute!

precipitation means it produces a solid,
Remove the solid from the solution by filtration

Reply 91

GemmaJorgensen

How many marks about do you reckon will be needed for an A*?

Reply 92

daniya12

Original post by Chlomc

Thats pretty much what i put! I hope its right

i think it is, having checked with class mates, more or less evryone put that, including the smartest girl!

Reply 93

Chlomc

Original post by GemmaJorgensen

How many marks about do you reckon will be needed for an A*?

It was 36 for jan 2012 and i found this much harder so im thinking around 34. Although some are saying this could be as high as 38 for A* :s

Reply 94

daniya12

Original post by GemmaJorgensen

How many marks about do you reckon will be needed for an A*?

im thinking around the 36/37 mark, high, yes i know, but form the looks of it, it seems the majority of people found it quite easy, then again, you never know?

Reply 95

osama2

Original post by Chlomc

It was 36 for jan 2012 and i found this much harder so im thinking around 34. Although some are saying this could be as high as 38 for A* :s

i said that sorry :frown:

. but lets just pray its not!

Reply 96

killmenow

What mark for an A or a B? Im thinking 28/9 ish for A?

Reply 97

Chlomc

Original post by osama2

i said that sorry :frown:

. but lets just pray its not!

I will actually cry if it is! I need a B atleast to do bio at a level :/

Reply 98

osama2

32 for an A maybe 33 :frown:

Reply 99

Chlomc

Original post by osama2

32 for an A maybe 33 :frown:

If we can get an unnoficial mark scheme done we could do a poll and see what everyone got. would give a pretty good idea whether it will be high or low boundries