PSLE 2009 - Science

[Tang]

hot_chocolate:

my answer for the pot/kettle question was: there is less contact between the surface of kettle b(the one with air spaces) compared to kettle a( the one without air spaces) thus, heat travels more quickly to the kettle a than b, causing the water in it to boil faster.


is my answer correct? I didn't mention that air is a good conductor of heat. :frustrated: yikes!!!

Hi Hot_chocolate,

Your answer is quite the same as what is given here:

http://pslescience.blogspot.com/

Instead of 'heat travels more quickly', it states that 'Pot A gained more heat' - more contact.

[Hello]

i wrote oxygen and water.

[MummyJamie]

acelancer:

MummyJamie:

Ohh, and what about the second question? The mouldy bread one? Is it water only?

i put water only but i think it's oxygen and water

I wrote oxygen&water but googling it doesn't work..

[caroline3sg]

what is the exaxt question on the bread mould?


Definitely not water only.

[yjmama]

My DD answered as water and oxygen

[acelancer]

at first i put oxygen and water then i kei kiang go change my ans.

[Hello]

What are the need(s) for a bread to turn mouldy?


(A)Oxygen
(B)Can’t remember
Water.

Its something like that.

[MummyJamie]

Hello:

What are the need(s) for a bread to turn mouldy?


(A)Oxygen
(B)Water
(C)Can't remember.

Its something like that.

C) Carbon dioxide, right?

[acelancer]

is there any mention of the right temperature??? i can’t remember it too

[Sahimi]

yjmama:

My DD answered as water and oxygen

My ans is water and oxygen too! :celebrate: