SC Science 2011 MARATHON (1 Viewer)

[girlworld_club]

CuCO3 + H20 = Hco3 + Cuo

Hydrogen carbonate + cooper oxide

 

[bleakarcher]

CuCO3 + H20 = Hco3 + Cuo

Hydrogen carbonate + cooper oxide

this is wrong as shit

 

[lath]

this is wrong as shit

The equation (coz it aint balanced) or the actual products?

 

[bleakarcher]

The equation (coz it aint balanced) or the actual products?

the products lol, completely off

 

[lath]

the products lol, completely off

what's the answer?

 

[bleakarcher]

what's the answer?

my mum is a chemist and she said copper hydroxide and carbon dioxide. this is not a sc science question lol

 

[Queenroot]

what's the answer?

All carbonates except group 1 metals are insoluble.

NO answer.

 

[bleakarcher]

All carbonates except group 1 metals are insoluble.

NO answer.

yeh, she wasnt sure a reaction would occur lol...

 

[starryblue]

my mum is a chemist and she said copper hydroxide and carbon dioxide. this is not a sc science question lol

sounds correct

 

[Queenroot]

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]

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 ?

is that just asking what is the difference between an element and a compound?

 

[starryblue]

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

 

[starryblue]

next question: describe Charles Darwin's contribution to natural selection using an example. [4marks]

 

[RivalryofTroll]

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

Correct

 

[starryblue]

Correct

-sigh- i learnt this a hundred million times but i still dont remember it. so if it's two or more of the same element, it is a.....?

 

[lath]

-sigh- i learnt this a hundred million times but i still dont remember it. so if it's two or more of the same element, it is a.....?

molecule

 

[starryblue]

molecule

ah! thought so...thanks

 

[lath]

next question: describe Charles Darwin's contribution to natural selection using an example. [4marks]

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.

 

[RivalryofTroll]

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.

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]

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?

Yep, they need long necks for fetching vegetation, therefore they bred long necked giraffes.

State the 3 main chemical equations.