Q&A - P3 Science

[tianzhu]

Lynn2:

Hi Tianzhu


While me and my girl was going thr question from http://www.wendykoh.com/08primary4-chijca2-science.pdf

question 3,which part of the egg provide food for the developing chick?

Answer is 3
But my girl answer is 1.

Wonder is there any mistake?thanks

Hi
Your girl is correct.
The yolk provides the developing embryo with nutrients.

[Lynn2]

Hi everyone out there…


Can someone help on this, please,more so on the explanation part as I think me and my girl concept on this is still not strong.thanks

This questions is from Nan Hua Pri Sa2 ,MCQ q9

An ice cube is left to melt on a metal tray .

Which of the following statement(s) is/are correct when the ice cube is melting?
A The temperature of the metal tray decreases.
B The liquid is losing heat to the surrounding air.
c The temperature of the ice cube rises above 0 degree cel.

My girl answer is 4 but the answer is 4

I try to think along water is a bad conductor of heat, but not sure that is the right way to explain…can someone advice and is there any book can enlighten the concept?Anyone use the smart series math?

I find that reading and grasping the concept well is impt to do such question, not sure am right.thanks

rgds,
Lynn2

[Lynn2]

sorri, the answer given was 1

[Dharma]

jesschan:

Please advise -

If a metal spoon is used to scratch a piece of chalk and an eraser, which one will have a deeper scratch?

Hi jesschan,

Compare the hardness of the chalk and eraser.A chalk has a better ability to withstand scratches compared to an eraser.

The eraser will have a deeper scratch.

[tianzhu]

Hi


option (1) is a logical answer.


The ice cube gained heat from the metal tray and surrounding air in order to melt.

The surrounding air is generally higher than the water which has just melted from the ice(0 degrees).

The temperature of the ice remains at 0 degree until all the ice has changed into water.

Please refer to Water and its changes of State in P4 textbook.In this instance, it does not show that water is a poor conductor of heat.

Hope this helps.

[Lynn2]

Hi Tianzhu


thanks but could you please explain on this :The liquid is losing heat to the surrounding air.

what should the correct statement about liquid?thanks


rgds
Lynn2

[jesschan]

Dharma:

Hi jesschan,


Compare the hardness of the chalk and eraser.A chalk has a better ability to withstand scratches compared to an eraser.

The eraser will have a deeper scratch.

Thanks.

[tianzhu]

Lynn2:

Hi Tianzhu

thanks but could you please explain on this :The liquid is losing heat to the surrounding air.
what should the correct statement about liquid?thanks
rgds
Lynn2

Hi

When a piece of ice is taken from the freezer and place in a warmer place, it begins to take in heat from the surroundings. At 0 degrees Celsius, ice melts to water (from solid to liquid).During this process, the ice continues to gain heat as it melts to become water. However, the temperature of the water remains constant at 0 degrees Celsius until all the ice has melted.Over a period of time, the water will gain heat from the surrounding as its temperature increases to room temperature.

Hence,it's incorrect to say that The liquid is losing heat to the surrounding air.

Please refer to your dd's P4 textbook for more detailed explanation.Hope this is of some use to you.

[Lynn2]

Thanks.Got it...


Have a good sunday...

tianzhu:

Hi

When a piece of ice is taken from the freezer and place in a warmer place, it begins to take in heat from the surroundings. At 0 degrees Celsius, ice melts to water (from solid to liquid).During this process, the ice continues to gain heat as it melts to become water. However, the temperature of the water remains constant at 0 degrees Celsius until all the ice has melted.Over a period of time, the water will gain heat from the surrounding as its temperature increases to room temperature.

Hence,it's incorrect to say that The liquid is losing heat to the surrounding air.

Please refer to your dd's P4 textbook for more detailed explanation.Hope this is of some use to you.

[divanhot]

[Moderator's note: Topics merged.]


hihi.. have a magnet question..


If pupils are lost in the jungle. There is a map, magnet, strings.

How they can find their way out of the jungle?