Year 12s: what will be the first way you research your future options? >>

AQA GCSE CHEMISTRY Unit 1 Question Game!

Scroll to see replies

pangea

Original post by Charlie223

Describe the Miller-Urey experiment,
. Must give gasses used
. Condition the gasses were in
. What was made and why there was a problem.

There was a reaction between methane, ammonia, hydrogen and nitrogen triggered by lightning. As a result amino acids formed, which combined producing organic matter; this evolved into living organisms.

Reply 42

Flammae

Original post by Charlie223

Describe the Miller-Urey experiment,
. Must give gasses used
. Condition the gasses were in
. What was made and why there was a problem.

The gases used were water vapour, hydrogen, ammonia, nitrogen, and hydrogen. The gases were sealed and heated. An electrical charge was then applied. Amino acids were formed, but not as many as there are on Earth, suggesting that the experiment was on the right lines, but not perfect

Reply 43

t10r

Original post by Charlie223

Describe the Miller-Urey experiment,
. Must give gasses used
. Condition the gasses were in
. What was made and why there was a problem.

Miller and Urey used 4 gases and put them in a container. These gases were Hydrogen, Nitrogen, Ammonia and Methane as the 2 scientists believed that these gases would have been present in the early atmosphere. The gases were in hot conditions and electricity was passed through the gases to simulate lightening that would have been present in the primitive atmosphere. After the experiment was left running for a week, amino acids were formed which are building blocks of a living organism. However, the problem was that the amino acids produced were very little.

I'm not quite sure about the answer so could someone correct me if it's wrong please?^

How did oceans form?

Describe the layered structure of the earth?

Posted from TSR Mobile

Reply 46

DatSmartGuy

What is locked up carbon dioxide?

Posted from TSR Mobile

Reply 47

Flammae

Original post by studentshavefun

How did oceans form?

Oceans formed because the water vapour released by volcanoes in the Earth's early atmosphere condensed, making water.

Reply 48

DatSmartGuy

Outline the advantages and disadvantages of using biofuels

Posted from TSR Mobile

Reply 49

Jamie Vardy

State and explain two impacts extracting metals can have on the environment. (4)

Reply 50

studentshavefun

Original post by DatSmartGuy

What is locked up carbon dioxide?

Posted from TSR Mobile

Carbon dioxide which hasn't been released into atmosphere

Reply 51

4dam

Original post by studentshavefun

How did oceans form?

Earth's temperature called steam that was present in the early Earth's atmosphere (from volcanic activity) condensed to form water filling up vast ditches in the land.

Reply 52

studentshavefun

Does cracking involve heating Alkanes or Alkenes?

Reply 53

Nicolejrd

Original post by studentshavefun

How did oceans form?

Both carbon dioxide and water vapour were present in the early atmosphere from volcanoes. There was a large amount of carbon dioxide causing the Earth to cool, so then the water vapour condensed forming the oceans.
Correct me if i'm wrong :smile:

Reply 54

4dam

Original post by DatSmartGuy

What is locked up carbon dioxide?

Posted from TSR Mobile

Carbon dioxide that has been trapped in something like an ocean or a living creature's body therefore isn't released back into the atmosphere

Reply 55

Nicolejrd

Original post by studentshavefun

Does cracking involve heating Alkanes or Alkenes?

Alkanes

Reply 56

MBK14

What would happen if it said suggest one reason and you put like 3

Posted from TSR Mobile

Reply 57

IAmAnTroll

Original post by DatSmartGuy

What is locked up carbon dioxide?

Posted from TSR Mobile

Carbon dioxide that is stored in sedimentary rocks.

Reply 58

Flammae

Original post by DatSmartGuy

Outline the advantages and disadvantages of using biofuels

Posted from TSR Mobile

Advantages:
-Carbon neutral
-Engines don't need to be converted
-Less sulphur dioxide and particulates produced than with normal petrol.

Disadvantages:
-Not enough to completely replace petrol and diesel
-Expensive to make
-Farmers could switch from growing food crops to growing plants for biofuels- leads to an increase in food prices.
-Clearing land/deforestation??? ( Not sure about this one.)