Thermal Energy

What is true about samples that are cold? (Select all that apply)

What is true about samples that are warm? (Select all that apply)

Claire has been sledding outside in the cold weather and her fingers are cold. She comes inside and puts her hands around a hot mug of tea. The energy of the molecules in her fingers increases. What must be true about the energy in the molecules in the mug?

What is the total thermal energy of the sample?

What is the average temperature of the sample?

Match the following

The molecules a sample has, the more __________________ it has.

Which pan has a higher temperature?

Which pan has a higher total energy?

What are the steps of energy transfer? Put step one at the top!

1. The two samples reach equilibrium
2. Energy transfers from the hot sample to the cold sample
3. Energy stops being transferred
4. The molecules collide

What would be the equilibrium point of the two objects below?

Object A: 700 molecules each with 52 kJ of energy

Object B: 1500 molecules each with 30 kJ of energy

Thermal energy and temperature are a measure of the same thing.

Which way does heat transfer between hot and cold objects?

What happens when ice is placed in warm water?

When a hot metal rod touches ice, energy transfers to...

What happens when you place a warm drink in a fridge?

When you touch a warm stove, heat transfers how?

At what temperatures do these gases have similar speeds?

Identify materials likely to have equal molecular speeds.

What occurs during an exothermic reaction?

What is true about endothermic reactions?

At what temperature do molecules have the highest kinetic energy?