3.2. Heat and Temperature

During a science experiment, Nam Khanh observed how different objects heat up when placed in the sun. He wondered, what is thermal energy?

• The energy of motion

• The energy of light

• The energy of sound

• The energy of heat

Phuong Anh 1 is conducting an experiment to understand how thermal energy is measured. How is thermal energy measured?

• In meters

• In kilograms

• In joules

• In degrees Celsius

What happens to the particles in a cup of hot chocolate that Thao Linh is holding when its thermal energy increases?

• They move slower

• They vibrate faster

• They become smaller

• They disappear

Thu Trang is curious about the concept of heat in his science class. What is heat?

• The total thermal energy of the particles in an object

• The energy of motion

• The energy of light

• The energy of sound

In a science experiment, Minh Hieu is heating a metal block. What determines the temperature of the metal block?

• The volume of the metal block

• The mass of the metal block

• The number of particles in the metal block

• The average kinetic energy of the particles in the metal block

Jacob and Zian have two containers filled with water. Both containers are at the same temperature, but one container is much larger than the other. Which container has more thermal energy?

• The container with the larger volume

• The container with the smaller volume

• They have the same thermal energy

• It depends on the mass of the containers

If two objects have the same volume but different temperatures, the object with the (a)   has more thermal energy. For example, if Khoi has a cup of hot coffee and Hai has a cup of cold water, which one has more thermal energy?

• The object with the higher temperature
• The object with the lower temperature
• They have the same thermal energy

• It depends on the mass of the object

Khanh Dan is observing a pot of water on the stove. What is the relationship between the thermal energy of the water and the speed of the water molecules?

• As thermal energy increases, the speed of the particles increases

• As thermal energy increases, the speed of the particles decreases

• There is no relationship between thermal energy and the speed of the particles

• The relationship depends on the mass of the object

Quynh Chi and Gia Linh are holding two metal rods at different temperatures. Can thermal energy be transferred between the rods?

• Yes

• No

• Only under certain conditions

• It depends on the temperature of the objects

Minh Nguye is curious: Can thermal energy be stored in an object?

• Yes

• No

• Only temporarily

• It depends on the temperature of the object