P3 TIMSS (Heat)

P3 TIMSS (Heat)

By Fong I Lou

Multiple Choice

Heat transfers from ___________.

• hotter part to the colder part

• colder part to the hotter part

​Heat transfer from the hotter part to the colder part.

We know that metals are good conductors of heat!

They can help transfer heat quickly!​

​

Non-metals are poor conductors of heat!

They transfer heat slowly!​ Then why not use it to trap heat?

This can help us keep warm!​

​

Multiple Choice

Good conductors _______ heat easily.

• transfer

• do not transfer

Multiple Choice

Poor conductors _______ heat easily.

• transfer

• do not transfer

Good conductors gains heat quickly but loses heat quickly as well!!!

The metal cup is a good conductor of heat.

It takes the heat away from the hot tea quickly!!!!

AND...

The metal cup then loses the heat to the surroundings quickly as well.

SO...

The hot cup of tea becomes cold quickly.​

Multiple Choice

If we want that thing to help transfer heat and get hot quickly, we will choose ___.

• good conductors of heat

• poor conductors of heat

Multiple Select

Choose the good conductors of heat.

• Copper

• Wood

• Plastic

• Iron

Multiple Choice

What kind of conductors of heat can TRAP heat better?

• good conductors of heat

• poor conductors of heat

Multiple Choice

What materials would you choose to make a bag that traps heat?

• Metal

• Thick plastic

• Wood

Multiple Select

Choose the poor conductors of heat.

• Copper

• Wood

• Plastic

• Iron

Multiple Choice

If we do not want our table to have a burnt mark, we will choose materials that are ____ to put in between the hot object and the table. because they transfer heat SLOWLY!

• good conductors of heat

• poor conductors of heat

The spoon becomes colder after a while.

Which of the following explains this?

​

A. The spoon loses heat to the ice cream.

B. The ice cream loses heat to the spoon.

C. The spoon gains heat from the ice cream.​

D. The ice cream loses heat to the surroundings.​

Ronald places a metal spoon in a bowl of ice cream as shown

​The ice cream is NOT hot. How can it lose heat? How can ice cream losing heat makes the spoon cold?

How can the spoon gaining heat makes it colder?

​The ice cream is NOT hot. How can it lose heat? How can ice cream losing heat makes the spoon cold?

​Conclusion: Spoon losing heat = becomes cold

Multiple Choice

The spoon becomes colder after a while because...

• The spoon loses heat to the ice cream.

• The ice cream loses heat to the ice cream.

• The spoon gains heat from the ice cream.

• The ice cream loses heat to the surroundings.

Multiple Choice

Mrs. Tay places a cup of hot tea on the table. The hot tea becomes cold after 30 minutes.

Which one of the following best explains this?

• The cup loses heat to the hot tea.

• The cup gains heat from the surroundings.

• The hot tea loses heat to the surroundings.

• The hot tea gains heat from the surroundings.

A. The cup loses heat to the hot tea.

B. ​The cup gains heat from the surroundings.

​C.​ The hot tea loses heat to the surroundings.

D. ​The hot tea gains heat from the surroundings.

​

Mrs. Tay places a cup of hot tea on the table. The hot tea becomes cold after 30 minutes.

Which one of the following best explains this?

​

​The cup makes the tea hot or the tea makes the cup hot?

Air makes the cup hot?!

Air makes the tea hot?!

When she came back two hours later, the ice cream had melted because the

​

A. ​ice cream has lost heat to the surrounding air.

B. ​ice cream has gained heat from the surrounding air.

C. ​surrounding air has gained heat from the ice cream.

D. ​​surrounding air has lost heat to the ice cream.

​

Shanice accidentally left her bowl of ice cream on the table.

Multiple Select

Shanice accidentally left her bowl of ice cream on the table.

When she came back two hours later, the ice cream had melted because the

• ice cream has lost heat to the surrounding air.

• ​ice cream has gained heat from the surrounding air.

• surrounding air has gained heat from the ice cream.

• surrounding air has lost heat to the ice cream.

When she came back two hours later, the ice cream had melted because the

​

A. ​ice cream has lost heat to the surrounding air.

B. ​ice cream has gained heat from the surrounding air.

C. ​surrounding air has gained heat from the ice cream.

D. ​​surrounding air has lost heat to the ice cream.

​heat from the cold ice cream?!?!?!

​heat from the cold ice cream?!?!?!

Multiple Choice

What would the temperature of the water in the large container most likely be?

• 20°C

• 50°C

• 70°C

• 90°C

​water at 70°C mixes with water at 20°C

A.​ 20°C

B. 50°C​

C. 70°C​

D. 90°C​

​how can it become hotter than ​70°C ?!

Multiple Choice

Which one of the following rods is the best conductor of heat?

• Rod A

• Rod B

• Rod C

• Rod D

Multiple Choice

Based on the result, which material of the rod would you choose to make a lunch box that can help keep the food warm?

• Rod A

• Rod B

• Rod C

• Rod D

​Rod D showed a material that is a poor conductor of heat. Thus, it can trap heat better than a good conductor of heat!

Fill in the Blank

Mr Victor heated a metal bar under high temperature and found that it could not fit into the metal gauge. Explain what happened to the metal bar after being heated.

Fill in the Blank

Yes, metals expand when heated. They _________ when cooled though.

Mr Victor conducted another experiment using three different materials, A B and C. He heated the materials to 50°C. He wanted to find out the change in temperature of the materials after he had stopped heating.

Multiple Choice

Which material is the best conductor of heat?

• A

• B

• C

Material C is the best conductor of heat because it loses heat the fastest!

Multiple Choice

Try this! Which material is the best conductor of heat?

• A

• B

• C

​metal

plastic

glass

ceramic

​Which of the following is a poor conductor of heat?

You may look at their thickness as well!

Multiple Choice

Which of the following is a poor conductor of heat?

Multiple Choice

Different materials transfer heat at __________.

• different rates

• the same rate

Multiple Choice

Which way would you choose to help keep food warmer?

Multiple Choice

Would you wrap tin foil first then place the food in a styrofoam box first or the other way round to keep food warm?