Q&A - P3 Science

[Nebbermind]

smartmummy:

I have a qn. This is not from P3 syllabus. We like to do experiments at home.Today we put egg (tooking from room temprature) in the tap water it sinked.Then we took an egg from freezer and put in the same water.It floated.What could be the reason?

interesting! I've never placed an egg inside the freezer before!!

[SAHM_TAN]

smartmummy:

I have a qn. This is not from P3 syllabus. We like to do experiments at home.Today we put egg (tooking from room temprature) in the tap water it sinked.Then we took an egg from freezer and put in the same water.It floated.What could be the reason?

[/quote]

From the freezer... Did you crack open the egg to check if it's frozen?

[smartmummy]

SAHM_TAN:

smartmummy:

I have a qn. This is not from P3 syllabus. We like to do experiments at home.Today we put egg (tooking from room temprature) in the tap water it sinked.Then we took an egg from freezer and put in the same water.It floated.What could be the reason?

From the freezer... Did you crack open the egg to check if it's frozen?[/quote]
I wanted to check then I forgot to check.

We always filled up water in a different shapes of recycle containers.After that took out the ice and looked the different shape of ice.One day i put that egg and wanted to see how it freeze and can show to kids.
In another day we check the egg sink or float in the tap water then in the salty water.Then I remembered that egg i put in the freezer.Then I checked.But I forgot to crack.I did this during cooking.So i throw everything and continued my cook.I will do in another time.

[smartmummy]

My son grows green bean plant.Its well up to young plant,then it dead.He put 4 seedlings in a small pot and pour water every day.Put outside so can get sunlight.After new leaves came it dead.What could be the reason?

I thought the root didn’t get air so I just dig(not deep) around the plant.Still no use, now only one plant alive but not healthy.Is that need big pot to get more air?

[mother777]

smartmummy,


I suspect, too much water.

too much water will cause the root to rot and the plant will die. since singapore is quite humid, too much watering is not required.

you can try watering on alternate days and see if the plant looks more healthy.

its good to know that your son is keen to do science experiments at home.

[smartmummy]

mother777:

smartmummy,


I suspect, too much water.

too much water will cause the root to rot and the plant will die. since singapore is quite humid, too much watering is not required.

you can try watering on alternate days and see if the plant looks more healthy.

its good to know that your son is keen to do science experiments at home.

Yup I thought of that then I alternate days pour the water after the leaves started to rot.Yup, he likes to do experiments.Thanks for ur input.

[Super.049652kiasu]

smartmummy,about the egg qn. If the egg froze it would have become denser than water, like ice. Therefore it would float. At least this is what I think.

[Super.049652kiasu]

sry, i mean water will become denser than the egg

[Super.049652kiasu]

In a p3 science revision paper, there was this qn. The question was ’ what happens to undigested food in the large intestine?’ . I thought the answer was water was absorbed from the undigested food. But the answer sheet said that the undigested food would be passed out through the anus. Who is correct?

[onlyling]

Hi,


Many of you mentioned past year exam papers and answers. Can I check if you are referring to those photocopied ones that we can buy in packs from private vendors? Or are there some exam paper books that I should get from Popular?

Thanks!