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SC Science 2011 MARATHON (3 Viewers)

Queenroot

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oh err .. i guess i kind of screwed this up.
Anyway next question: What is the difference between a molecule of an element and a molecule of a compound ?
 
starryblue

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Adrita said:
oh err .. i guess i kind of screwed this up.
Anyway next question: What is the difference between a molecule of an element and a molecule of a compound ?
Click to expand...
is that just asking what is the difference between an element and a compound?
 
starryblue

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an element is one atom while a compound contains 2 or more elements bonded together, correct?
 
starryblue

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next question: describe Charles Darwin's contribution to natural selection using an example. [4marks]
 
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starryblue said:
next question: describe Charles Darwin's contribution to natural selection using an example. [4marks]
Click to expand...
Charles Darwin went to the Galapagos Islands (not sure about spelling lol) and saw 14 different finches, which were geographically isolated and situated in different areas. He noticed that the finches had developed favourable characteristics (e.g. beak size and shape) that allowed them to be better suited/adapted to the environment, therefore increasing their chance of survival, so that they could reproduce and build their population. Anywayz, the finches had developed different characteristics and are now classed as different species. As a result, he proved that the environment selects favourable characteristics so that a species is better adapted to the environment (natural selection) and reduces the frequency of unfavouurable characteristics.
 
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RivalryofTroll

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lath said:
Charles Darwin went to the Galapagos Islands (not sure about spelling lol) and saw 14 different finches, which were geographically isolated and situated in different areas. He noticed that the finches had developed favourable characteristics (e.g. beak size and shape) that allowed them to be better suited/adapted to the environment, therefore increasing their chance of survival, so that they could reproduce and build their population. Anywayz, the finches had developed different characteristics and are now classed as different species. As a result, he proved that the environment selects favourable characteristics so that a species is better adapted to the environment (natural selection) and reduces the frequency of unfavouurable characteristics.
Click to expand...
Would an example for this explanation be like giraffes?
They needed longer necks to reach for the food in the trees so this was a favourable characteristic which would allow them to adapt in their environment and hence survive. That's why the characteristic of long necks was passed down until even the Modern giraffes?
 
Magical Kebab

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RivalryofTroll said:
Would an example for this explanation be like giraffes?
They needed longer necks to reach for the food in the trees so this was a favourable characteristic which would allow them to adapt in their environment and hence survive. That's why the characteristic of long necks was passed down until even the Modern giraffes?
Click to expand...
Yep, they need long necks for fetching vegetation, therefore they bred long necked giraffes.

State the 3 main chemical equations.
 
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