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# AQA GCSE - Unit 3 (P3,B3,C3) New specification papers. watch

1. (Original post by Captain Anonymous)
LOL, sorry to disappoint but i've only done the first half of physics. All the X-rays and lenses work .
LOL! okay!
Then....
Explain how is ultrasound used for pregnancy checks..
2. (Original post by Captain Anonymous)
Explain what is meant by an image being virtual
Virtual image is when the light rays dont actually meet..
And is produced my diverging lens ...
hope this is right
3. (Original post by Arshii)
Virtual image is when the light rays dont actually meet..
And is produced my diverging lens ...
hope this is right
yeah it is, its when the image is placed where it can't possibly be , just to add to your answer,

State two ways in which convex lenses are different to concave lenses
4. (Original post by Arshii)
Virtual image is when the light rays dont actually meet..
And is produced my diverging lens ...
hope this is right
(Original post by Captain Anonymous)
yeah it is, its when the image is placed where it can't possibly be , just to add to your answer,

State two ways in which convex lenses are different to concave lenses
Can I join?
5. (Original post by lolface32)
Can I join?
sure
6. how does hardwater form scale and scum...
7. (Original post by Captain Anonymous)
how does hardwater form scale and scum...
Scum is formd when soap reacts with dissolved minerals in the water. Scale is formed when heat is applied to hard water.
8. (Original post by Captain Anonymous)
yeah it is, its when the image is placed where it can't possibly be , just to add to your answer,

State two ways in which convex lenses are different to concave lenses
Convex:
-Forms a real image
-Make the light rays converge to a focus

Concave:
-Forms a virtual image
-Makes the parallel light rays diverge - spread out

Name and tell the functions the parts of the eye..
9. Titration question!
What mass of potassium sulfate ,K2SO4, is there in 250cm3 of a 1 mol/dm3 solution?
10. How is the leaf made effeicent for gaesous exachange
11. (Original post by Captain Anonymous)
How is the leaf made effeicent for gaesous exachange
THe stomata on the underside of the leaf.... air spaces within the leaf.. flattened shape increases the area of exchange

???? right???

How do old and new artificial ventilators work?
12. (Original post by Blake-inator)
THe stomata on the underside of the leaf.... air spaces within the leaf.. flattened shape increases the area of exchange

???? right???

How do old and new artificial ventilators work?
its a good start, waxy cuticle to reduce water loss, air spaces so co2 can diffuse, stomata which allows gaseous exachange controlled by guard cells. Long roots increase surface area
13. (Original post by Blake-inator)
How do old and new artificial ventilators work?
The negative pressure - 'iron lung', person lies in chamber and air is absorbed to create a vaccum and then the intercorsal muscles contract making the ribs to move upwards and outwards which casues the diaphragm to flatten, increase volume of thorax which decreases the pressure in the chest. Hence, you breathe in. ETC.

Positive pressure- basically its like a pump
14. How do you find the centre of mass of a thin irregular sheet of a material??
15. plum line thingy.. two lines intersection is centre of mass
16. What's everyone revising today ?

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17. Everyone that wants to join the ultimate revision game come on at 5pm and we'll do it!!!

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18. (Original post by lolface32)
Titration question!
What mass of potassium sulfate ,K2SO4, is there in 250cm3 of a 1 mol/dm3 solution?
Omg how would you do this question? i cant do it can you help me please?
19. Motor effect and all that is hard...
20. yeah, thats the worst part imo, B3b from the CGP is quite easy though... and so is P2 and P3a
I find chemistry the hardest though

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