Question

which statement describes what happens when ice freezes, according to the kinetic theory?
the water molecules decrease their speed.
the water molecules increase their speed.
the water molecules do not change speed.
question 5
1 pts
in what phase, solid, liquid or gas are the particles spread farthest apart and moving freely?
liquid
solid
gas

Explanation:

• When ice freezes, it is a process of losing heat. According to the kinetic theory, the kinetic energy of molecules is related to temperature. Lower temperature means lower kinetic energy, and since kinetic energy \(E_{k}=\frac{1}{2}mv^{2}\) (where \(m\) is the mass of the molecule and \(v\) is the speed), a decrease in kinetic energy (due to lower temperature during freezing) leads to a decrease in the speed of water molecules.
• In gases, the intermolecular forces are the weakest compared to solids and liquids. So, gas particles are spread farthest apart and can move freely. In solids, particles are closely packed in a fixed - position lattice, and in liquids, particles are closer together than in gases and have more restricted movement compared to gases.

Answer:

• First question: The water molecules decrease their speed.
• Second question: gas