Thermal energy

When a body stores a lot of heat, it is said to be hot.

• FALSE

• TRUE

Heat is a physical quantity that measures the thermal energy of a body.

• TRUE

• FALSE

In SI units, temperature is measured in kelvin, K.

• TRUE

• FALSE

When two bodies are brought into contact with each other, the one with

the higher temperature transfers thermal energy through heat to the one

with the lower temperature.

• TRUE

• FALSE

A person’s normal body temperature is 35 °C how many degrees on the Fahrenheit scale is this

• 95°F

• 90°F

• 98°F

• 100°F

The temperature of the surface of the Sun is about 5 000 °C. How many K’s is this?

• 5273°K

• 5273 K

• 5000 K

• None of the above

We pour 50 mL of milk which has a temperature of 80 °C into a beaker that contains 100 mL of coffee which is at a temperature of 37 °C. Which particles transfer energy to the others?

• From milk to coffe

• From coffe to milk

During a material’s change of state, its temperature

• Increases

• Remains constant.

Generally, when bodies increase in temperature, its densisty

• Increase

• Decrease

When heat modifies the internal composition of matter, ...

• A physical change occurs.

• A chemical change occurs.