Question

molecules have
a) both potential and kinetic energy.
b) only kinetic energy.
c) only potential energy.
d) neither kinetic nor potential energy.
question 13 (5 points)
listen
which of the following is an example of matter?
a) your thoughts
b) the air around you
c) radio waves
d) heat from a fire

Explanation:

• For the first question (molecules' energy):
• Molecules are in constant motion (translational, rotational, vibrational), so they have kinetic energy.
• There are intermolecular forces (e.g., van der Waals forces, hydrogen - bonds) that give rise to potential energy between molecules.
• For the second question (example of matter):
• Matter is anything that has mass and occupies space.
• Your thoughts are not matter (they are electrical and chemical signals in the brain).
• Radio waves are electromagnetic waves (no mass in the traditional sense of matter).
• Heat from a fire is a form of energy (thermal energy).
• The air around you is a mixture of gases (e.g., \(N_2\), \(O_2\)), which have mass and occupy space.

Answer:

• First question: A. both potential and kinetic energy.
• Second question: B. The air around you.