Dear Tianzhu


I'll try to enlarge them and put the sources in - some are from P6 past year papers, some from P4 assessment books - neither a parent or student, just looking for some help

tianzhu:

Hi Drdj

Could you help to provide the sources of your questions eg ACS P6 Sci Q35 SA2 2008?

It appears to me that the questions are from different levels? Just curious, are you a parent or student?

The scanned image may be slightly blurred and small and it may helpful to refer to the originals from http://www.wendykoh.com. Otherwise, it's very taxing for an old man like me to read.

Dear Dharma,


Thanks...for the 2nd question on the right, is it practically possible to push the plunger in, though air can be compressed? If the syringe is upright, that's perfectly fine.

Dharma:

Drdj:

Dear tianzhu and dharma,

Thanks so much !! Appreciate your detailed explanations !!
Have scanned some further queries from various sources - hope you can help me with them - apologies for the many attachments, as I'm not sure how to do it all in 1 !!
Thanks again

http://www.postimage.org/image.php?v=PqmEHfJ

Air will compress to occupy the max. space in the jar (200cm3)

Dear Dharma,


My apologies...the question part (c) should read \"Explain the difference between in the results from the two test-tubes\". Thanks.

Dharma:

Drdj:

Dear tianzhu and dharma,

Thanks so much !! Appreciate your detailed explanations !!
Have scanned some further queries from various sources - hope you can help me with them - apologies for the many attachments, as I'm not sure how to do it all in 1 !!
Thanks again

http://www.postimage.org/image.php?v=PqmEJKS

Q46
a) To find out how different temperatures of water in which the test tube containing yeast with sugar solution is immersed affect the amount of CO2 produced by the yeast.

b) 60 degrees celcius.

c) Sorry, I cant read the Qn

Dear Dharma,


Thanks for your explanation. However, since air can be compressed, doesn't it mean 250 cm3 of air can fit into the flask volume of 200 cm3?
Or does it mean that no matter how much air there is, the flask volume is limited??

Dharma:

Drdj:

Dear tianzhu and dharma,

Thanks so much !! Appreciate your detailed explanations !!
Have scanned some further queries from various sources - hope you can help me with them - apologies for the many attachments, as I'm not sure how to do it all in 1 !!
Thanks again

http://www.postimage.org/image.php?v=PqmEHfJ

Air will compress to occupy the max. space in the jar (200cm3)

Dear all,


Further queries Thanks in advance
http://www.postimage.org/image.php?v=gx1amC99

http://www.postimage.org/image.php?v=gx1amEEi

http://www.postimage.org/image.php?v=gx1amH8r

http://www.postimage.org/image.php?v=gx1amJDA

http://www.postimage.org/image.php?v=gx1amM7J

Dear tianzhu and dharma,


Thanks so much !! Appreciate your detailed explanations !!
Have scanned some further queries from various sources - hope you can help me with them - apologies for the many attachments, as I'm not sure how to do it all in 1 !!
Thanks again
http://www.postimage.org/image.php?v=PqmECgr

http://www.postimage.org/image.php?v=PqmEELA

http://www.postimage.org/image.php?v=PqmEHfJ

http://www.postimage.org/image.php?v=PqmEJKS

http://www.postimage.org/image.php?v=PqmEMf0

Thanks again

JustKP:

Drdj:

Dear all,

Could you help me to solve this?
Thanks a lot
http://www.postimage.org/image.php?v=aV15TSLS

Angle AED is 90, so angle DAE is 27. Thus angle x is 36 (90-27-27).

Dear all,


Could you help me to solve this?
Thanks a lot
http://www.postimage.org/image.php?v=aV15TSLS

Dear JustKP,


Thanks so much !!

JustKP:

Drdj:

Dear all,

Could you explain the solution of this sum from Ai Tong 2008?
The triangles are both isoceles (45, 45, 90), but I just can't seem to get it
Thanks in advance

http://www.postimage.org/image.php?v=Pq9MGnr

Hi, just joined the 2 triangles together to get an isoseles triangle of both sides 10cm (radius of the circle).

Dear all,


Could you explain the solution of this sum from Ai Tong 2008?
The triangles are both isoceles (45, 45, 90), but I just can't seem to get it
Thanks in advance

http://www.postimage.org/image.php?v=Pq9MGnr