Q&A - PSLE Science

[verykiasumummy]

pecalis:

Fertilisation occurs when the nucleus of sperm fuses with the nucleus of egg. Child's answer is correct, not just fusing (or fusion?) of sperm and egg but the fusing of both nuclei.

This is my understanding from my son's Sc notes.

yes u are right, dunno what i was thinking just now.. but my ds did mention something like \"the combination of the nuclei from both parents contains characteristics...\" and the teacher mark it wrong. i couldnt rmb the exact reason that the teacher gave, but my ds was taught to just say, \"the egg cell from mother and sperm cell from father fuse during fertilisation and pass their characteristics to their offspring.\"

hope it helps.

[Studious Alien]

verykiasumummy:

maybe i can help.

both the ice cubes melted at their contact surfaces, hence changes its state to liquid. due to some of the liquid on the surface of both ice cubes losing heat to the ice cubes again, it changes its state back to solid, hence joining the two ice cubes together.

Thank you very much verykiasumummy.

[verykiasumummy]

Studious Alien:

verykiasumummy:

maybe i can help.

both the ice cubes melted at their contact surfaces, hence changes its state to liquid. due to some of the liquid on the surface of both ice cubes losing heat to the ice cubes again, it changes its state back to solid, hence joining the two ice cubes together.

Thank you very much verykiasumummy.

no thks... was just trying to help...

[NY1969]

Can someone ans this question in a scientific way:-


A metal rod is partially is submerged into an ice water. After sometimes, why is the other end of the rod becomes cool also?

[G Tan]

NY1969:

Can someone ans this question in a scientific way:-


A metal rod is partially is submerged into an ice water. After sometimes, why is the other end of the rod becomes cool also?

question is not clear.. what you mean by the othr end?

[ruohoo97]

NY1969:

Can someone ans this question in a scientific way:-


A metal rod is partially is submerged into an ice water. After sometimes, why is the other end of the rod becomes cool also?

Because metal is good conductor of heat. It transmits heat more quickly so you will feel the other end getting cold too. Note here, the feeling of cold reflects the difference of temperature.

[NY1969]

Thanks. So the answer shld be…as metal is a good conductor of heat, the metal rod loses heat quickly to the surroundings and hence the other end of rod will be cooled eventually. Is this explanation ok?

[verykiasumummy]

NY1969:

Can someone ans this question in a scientific way:-


A metal rod is partially is submerged into an ice water. After sometimes, why is the other end of the rod becomes cool also?

Metal is a good conductor of heat, so the part that is submerged will lose its heat to the ice water quickly. And since heat travels from a hotter place to a colder place, the other end of the metal will also lose heat to the ice, causing it to be cold eventually.

[NY1969]

Thanks verykiasumummy, well explained!

[verykiasumummy]

NY1969:

Thanks verykiasumummy, well explained!

welcome... just exchanging...