Thermal Energy and States of Matter

The video tutorial reviews key concepts for an upcoming quiz, covering states of matter, molecular composition, forces between particles, and the relationship between thermal energy and temperature. It emphasizes the importance of understanding the differences between solid, liquid, and gas states, calculating the number of atoms in molecules, and how thermal energy affects particle movement and potential energy. The tutorial concludes with a review of these concepts to prepare students for the quiz.

Which of the following is not a state of matter?

• Gas

• Liquid

• Solid

• Plasma

If you have two molecules, how many sodium atoms are needed?

• Four

• Three

• Two

• One

How many oxygen atoms are present in two molecules if each molecule contains three oxygen atoms?

• Eight

• Four

• Three

• Six

What happens to the forces between particles as they move apart?

• They get stronger

• They get weaker

• They remain the same

• They disappear

Which state of matter has the most potential energy?

• Liquid

• Solid

• Gas

• Plasma

What is thermal energy a sum of?

• None of the above

• Kinetic and potential energy

• Potential energy only

• Kinetic energy only

What happens to particles in a solid when thermal energy is added?

• They slow down

• They stop moving

• They move closer

• They move farther apart

What does temperature measure in a substance?

• Total energy

• Thermal energy

• Average kinetic energy

• Potential energy

If kinetic energy remains constant, what can cause an increase in thermal energy?

• Decrease in potential energy

• Increase in potential energy

• Decrease in kinetic energy

• Increase in kinetic energy

Which state of matter has the slowest moving particles?

• Solid

• Gas

• Plasma

• Liquid