some gcse chemistry c1 questions please Watch

Billsonbubbles
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:eek: hi all,


I would just like to see if anyone could ask me some c1 questions, as I have done all past papers etc....


many thanks
Will
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jadeskittles
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(Original post by Billsonbubbles)
:eek: hi all,


I would just like to see if anyone could ask me some c1 questions, as I have done all past papers etc....


many thanks
Will
I'll give you a few.

1. Explain the process of hydrogenation: why it is used and the conditions under which it is done.
2. Compare the Earth's early atmosphere to the atmosphere today. Why has it changed?
3. What is the chemical name for limewater?
4. Name a cause of acid rain.
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Billsonbubbles
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(Original post by jadeskittles)
I'll give you a few.

1. Explain the process of hydrogenation: why it is used and the conditions under which it is done.
2. Compare the Earth's early atmosphere to the atmosphere today. Why has it changed?
3. What is the chemical name for limewater?
4. Name a cause of acid rain.
Can you explain hydrogenation ?

and there is a lot less c02 because the strombattlities which were the first photosynthesising plants changed the02 into the oxygen on which we survive, it was also taken in by the oceans and rivers?

Calcium hydroxide solution?

Sulphur dioxide being emitted from the factories etc..

any more please?
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jadeskittles
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(Original post by Billsonbubbles)
Can you explain hydrogenation ?

and there is a lot less c02 because the strombattlities which were the first photosynthesising plants changed the02 into the oxygen on which we survive, it was also taken in by the oceans and rivers?

Calcium hydroxide solution?

Sulphur dioxide being emitted from the factories etc..

any more please?
Your answers were all correct.

Hydrogenation is the hardening of an unsaturated oil and making it saturated. Hydrogen, a temperature of 60 degrees C and a nickel catalyst are used to break the double bonds. An example is making margarine.

Some other questions:
1. Explain the Miller-Urey experiment.
2. Advantages and disadvantages of quarrying
3. General formula for alkanes/alkenes?
4. How to make: cement/concrete/mortar?
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Billsonbubbles
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(Original post by jadeskittles)
Your answers were all correct.

Hydrogenation is the hardening of an unsaturated oil and making it saturated. Hydrogen, a temperature of 60 degrees C and a nickel catalyst are used to break the double bonds. An example is making margarine.

Some other questions:
1. Explain the Miller-Urey experiment.
2. Advantages and disadvantages of quarrying
3. General formula for alkanes/alkenes?
4. How to make: cement/concrete/mortar?
The miller Urey experiment was testing water hydrogen methane and ammonia. They zapped it with lighting, and this was to emulate lightining in earths early atmosphere , this formed amino acids but they did not have a life form there because
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Billsonbubbles
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(Original post by jadeskittles)
Your answers were all correct.

Hydrogenation is the hardening of an unsaturated oil and making it saturated. Hydrogen, a temperature of 60 degrees C and a nickel catalyst are used to break the double bonds. An example is making margarine.

Some other questions:
1. Explain the Miller-Urey experiment.
2. Advantages and disadvantages of quarrying
3. General formula for alkanes/alkenes?
4. How to make: cement/concrete/mortar?
The miller Urey experiment was testing water hydrogen methane and ammonia. They zapped it with lighting, and this was to emulate lightining in earths early atmosphere , this formed amino acids but they did not have a life form there because they had oxygen I think 2)an advantage of quarrying is that it provides jobs and boosts local economy , but the disadvantages are it destroys habitat but fills it with water after 100 years , another disadvantage could be that it is noise and eye pollution plus it discourages tourism which is bad for the town. 3) Alkenes - CnH2n+2 alkane - CnH2n 4) concrete - cement and sand and water and gravel , cement - limestone and clay heated . Mortar - cement and sand and water
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jadeskittles
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(Original post by Billsonbubbles)
The miller Urey experiment was testing water hydrogen methane and ammonia. They zapped it with lighting, and this was to emulate lightining in earths early atmosphere , this formed amino acids but they did not have a life form there because they had oxygen I think 2)an advantage of quarrying is that it provides jobs and boosts local economy , but the disadvantages are it destroys habitat but fills it with water after 100 years , another disadvantage could be that it is noise and eye pollution plus it discourages tourism which is bad for the town. 3) Alkenes - CnH2n+2 alkane - CnH2n 4) concrete - cement and sand and water and gravel , cement - limestone and clay heated . Mortar - cement and sand and water
That's pretty much all correct. The answers were:

1. Explain the Miller-Urey experiment.
-Two scientists wanted to see if substances made by living things today could be formed in the conditions of the early Earth.

-They tried to recreate the Earth's early atmosphere which was thought to consist of water, hydrogen, ammonia and methane.

-They sealed these four things in a sterile flask.

-The mixture was heated. This turned the water into water vapour.

-Electric sparks (to simulate lightning) were passed through the mixture.

-The contents were analysed after a week.

-Amino acids were found.

2. Advantages and disadvantages of quarrying.
Advantages:
-Jobs provided
-Can be used as landfill sites afterwards
-Useful materials are gained from it
Disadvantages:
-Noise disrupts locals
-Habitats impacted/destroyed
-Visual pollution
-Air pollution

3. General formula for alkanes/alkenes?
You might want to revise this as you got it the wrong way round.
Alkane: CnH2n+2
Alkene: CnH2n

4. How to make cement/concrete/mortar?
Cement: powdered limestone + clay (heated in a rotary kiln)
Concrete: cement + sand + water + aggregateMortar: cement + sand + water
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Billsonbubbles
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(Original post by jadeskittles)
That's pretty much all correct. The answers were:

1. Explain the Miller-Urey experiment.
-Two scientists wanted to see if substances made by living things today could be formed in the conditions of the early Earth.

-They tried to recreate the Earth's early atmosphere which was thought to consist of water, hydrogen, ammonia and methane.

-They sealed these four things in a sterile flask.

-The mixture was heated. This turned the water into water vapour.

-Electric sparks (to simulate lightning) were passed through the mixture.

-The contents were analysed after a week.

-Amino acids were found.

2. Advantages and disadvantages of quarrying.
Advantages:
-Jobs provided
-Can be used as landfill sites afterwards
-Useful materials are gained from it
Disadvantages:
-Noise disrupts locals
-Habitats impacted/destroyed
-Visual pollution
-Air pollution

3. General formula for alkanes/alkenes?
You might want to revise this as you got it the wrong way round.
Alkane: CnH2n+2
Alkene: CnH2n

4. How to make cement/concrete/mortar?
Cement: powdered limestone + clay (heated in a rotary kiln)
Concrete: cement + sand + water + aggregateMortar: cement + sand + water

Thankyou your a life saver- thanks I will note all that down thanks!
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