Q&A - P3 Science

[Full.010894Cream]

Lynn2:

One question to ask ks member here....


The table below shows the melting points of substances P,Q,Rand s.

Substance Melting point (deg cel)

p 49
q 5
r 23
s 0

At 20 deg, which of the above substances would have changed from a solid state to a liquid state?
p only q only
p and r only q and s only

Can check what is substance p and r are?

what is 20 deg to 49deg and what is 20 deg to 23 deg as in what state is that?thanks

rgds

try to relate this to something familiar, eg, ice which melting point is 0 deg C.

when temp is anything higher than its melting point, eg, 20 deg C, the ice (s) will start to melt. Similarly, 20 deg is also higher than q's melting point so it'll also melt.

Since substance p & r only melt at higher temp than 20 deg C, it'll remain as solid.

Not important what they are as this is a test for the understanding of melting point.

[acforfamily]

Hi,

Can someone advise whether a centipede has 6 legs or more? According to my son, teacher told him that the rest of the centipede ‘legs’ are actually muscles and not legs.

And if they are actually legs, are they considered insects? Insects have only 6 legs per definition for P3.

Thanks in advance.

[watmekiasu]

A centipede has 2 legs on each body segment. It also has more than 3 segments. Hence it is not an insect.

[Full.010894Cream]

tianzhu:

Thank you for your help.


Which properties of the brown gas are shown by the above experiment?
A: It can be compressed.
B: It has no definite shape.
It has no definite volume.

A.A only
B.A and B only
C.B and C only
D.A, B and C only

http://farm4.static.flickr.com/3539/3499368658_ae0f175df7_o.jpg\">

anyone knows the answer? B is obvious, and if C is true, then A is true. So answer shd be 'D'.

BTW, why is there a need for 'only' in anwer 'D'?? :?

[Dharma]

Full.Cream:

tianzhu:

Thank you for your help.


Which properties of the brown gas are shown by the above experiment?
A: It can be compressed.
B: It has no definite shape.
It has no definite volume.

A.A only
B.A and B only
C.B and C only
D.A, B and C only

http://farm4.static.flickr.com/3539/3499368658_ae0f175df7_o.jpg\">

anyone knows the answer? B is obvious, and if C is true, then A is true. So answer shd be 'D'.

BTW, why is there a need for 'only' in anwer 'D'?? :?

I think the answer should be Option C (B & C only).

B – The brown gas has no definite shape. It takes up the shape of the jar.
C – The brown gas has no definite volume. It takes up the whole volume of the jar.

Now going to A – It can be compressed.
Although the brown gas can be compressed but the above experiment does not show the fact that air is being compressed. Therefore, I will not choose property A.

[acforfamily]

acforfamily:

Hi,

Can someone advise whether a centipede has 6 legs or more? According to my son, teacher told him that the rest of the centipede 'legs' are actually muscles and not legs.

And if they are actually legs, are they considered insects? Insects have only 6 legs per definition for P3.

Now my son said that he was referring to a caterpillar, not centipede. :oops:

[watmekiasu]

A caterpillar is in the development cycle of a moth/butterfly. It is still considered an insect altho it has yet to reach the adult stage of an insect.

[Full.010894Cream]

Dharma:

I think the answer should be Option C (B & C only).


B – The brown gas has no definite shape. It takes up the shape of the jar.
C – The brown gas has no definite volume. It takes up the whole volume of the jar.

Now going to A – It can be compressed.
Although the brown gas can be compressed but the above experiment does not show the fact that air is being compressed. Therefore, I will not choose property A.

I guess it's a matter of whether to include A or not.
My inclusion of A is based on the fact that it has no definite volume (C). Whether its actual volume is bigger or smaller than the jar's volume, it'll still fill the jar. Therefore it can be compressed or expanded according to it container. It'd be intersting to know the given answer.

[AnnT2009]

[Moderator's note: Topics merged.]


Pls help.

Q1 Which of the following is true for all fungi?
A) They are all edible.
B) They reproduce by spores.
C) They make their own food.
D) They are found everywhere.

1) B only
2) A and B only
3) B and D only
4) A, B, C and D only

TIA.

[tony]

B only.