The speed of the particles decreases. The particles begin to move in a straight line. The particles begin to move with a greater force. The motion of the particles becomes more random.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The freezing point of nitrous oxide is -91°C. Which of the following statements best describes the effect on the particles in liquid nitrous oxide as its temperature is lowered to -91°C?
Possibilities:
- The speed of the particles decreases.
- The particles begin to move in a straight line.
- The particles begin to move with a greater force.
- The motion of the particles becomes more random.

The speed of the particles decreases.