Q&A - PSLE Science
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adellwong:
Your niece's answer is generally acceptable. The ice cubes are to lower the temperature so that the water vapour has something cool to condense on.What is the purpose of putting ice cubes on the plastic sheet?
DN (=Darling NIece) 's answer: To lower the temperature of the plastic sheet.
State the 4 major changes that have led to the water droplets being formed.
DN's answer: Hot water evaporates to form water vapour.
Plastic sheet loses heat to the ice.
Water vapour loses heat to the cooler part of beaker and plastic sheet
and condenses to form water droplets.
Is my niece's answer acceptable?
The rest of her answers mention the 4 major changes that have taken place. Great job! -
ParentingChildren:
ParentingChildren:
Your niece's answer is generally acceptable. The ice cubes are to lower the temperature so that the water vapour has something cool to condense on.adellwong:
What is the purpose of putting ice cubes on the plastic sheet?
DN (=Darling NIece) 's answer: To lower the temperature of the plastic sheet.
State the 4 major changes that have led to the water droplets being formed.
DN's answer: Hot water evaporates to form water vapour.
Plastic sheet loses heat to the ice.
Water vapour loses heat to the cooler part of beaker and plastic sheet
and condenses to form water droplets.
Is my niece's answer acceptable?
The rest of her answers mention the 4 major changes that have taken place. Great job!
Thanks for your help
Both of of us thought it was too lengthy. DN insisted her teacher said the correct way of answering is 'something lose/gain heat...... water vapour/water droplets formed'.
I have to admit the kids are having a harder time compared to us. I don't remember my PSLE being so difficult
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How do you answer this question on Heat and Temperature the Singapore PSLE way?
Scenario : John nd Mary walked into an air-conditioned shopping centre during the daytime. They made the following comments:
Mary : Brr … it’s freezing cold in here.
John : Are you kidding? It’s so hot!
Q1. One of the teenagers above had just spent an hour packing frozen meat in the coldroom of a meat factory next to the shopping centre. Who is it?
Ans: John (easy enough)
Q2. Explain your answer.
The answer given in the assessment book is : "Since John packed frozen meat in a coldroom, he would feel very cold. When he next walked into the shopping centre, he could feel the effect of the increase in temperature more intensely. This made him feel hotter than it actually was."
But my daughter said her science teacher said science questions must be answered the science way : meaning the words ‘heat gain’ and ‘heat loss’ must be used.
How would you answer this question to the satisfaction of the graders? Pls help. -
anneshirleygilbert:
\"Since John was from a coldroom, this skin temperature will be lower than the temperature in the shopping centre. As heat flows from a place of higher temperature to a place of lower temperature, heat from the surrounding air in the shopping centre will flow to his skin. His skin \"gained heat\" causing him to feel warmer.....
Q2. Explain your answer.
The answer given in the assessment book is : \"Since John packed frozen meat in a coldroom, he would feel very cold. When he next walked into the shopping centre, he could feel the effect of the increase in temperature more intensely. This made him feel hotter than it actually was.\"
But my daughter said her science teacher said science questions must be answered the science way : meaning the words 'heat gain' and 'heat loss' must be used.
How would you answer this question to the satisfaction of the graders? Pls help. -
Thank you, Atutor.
By the same token, we can then say, Mary felt cold because the temperature in the shopping centre was lower than where Mary was earlier. Her body lost heat to the surrounding in the shopping centre, so she felt cold. Is this reasoning correct? -
anneshirleygilbert:
Correct.Thank you, Atutor.
By the same token, we can then say, Mary felt cold because the temperature in the shopping centre was lower than where Mary was earlier. Her body lost heat to the surrounding in the shopping centre, so she felt cold. Is this reasoning correct?
Feel warm = body gain heat
Feel cold = body lose heat
Cheers -
Many thanks, Atutor.
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Can somebody pls help with this question?
We know :
The freezing point of water is 0 degrees.
The melting point of ice is 0 degrees.
Are the following two statements correct?
Water at 0 degrees is in the solid state.
Ice at 0 degrees is in the liquid state.
In view of the above, does it mean the following two statements are incorrect?
Water at 0 degrees is in the liquid state.
Ice are 0 degrees is in the solid state.
Thank you in advance. -
May I know what should be the answer to this question? Thanks.
http://postimage.org/image/2v9wcto10/ -
Hi All,
I need help for the following question:-
What conclusion can be drawn from the experiment?
A: The lower the height of the marble, the lower the kinetic energy.
B: The greater the height of the marble, the greater the potential energy. The greater the mass of the marble, the greater the potential energy.
(1) A only
(2) B only
(3) A and B only
(4) A, B and C
http://postimage.org/image/1t7qubr6s/
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