Answer: The motion becomes slower and the distance between particles decreases
Step-by-step explanation:
With these kinds of problems, I like to sort of personify the particles, thinking of a group of particles as a group of people.
In a room with no windows (to make it like a container), there is a large group of people. Think about how you feel if you are a person in that crowd and the temperature starts to increase; you want to stay further away from other people so that you don't feel even warmer, and you can move faster.
Think about how you feel if you are a person in that crowd and the temperature starts to decrease; you want to get closer to other people so that you can get warmer (like what penguins do), and you move a bit slower. I think of it as, "if I'm super cold, I don't want to move around too much because I'm constantly exposed to the cold air, but if I stay still and hug my arms to my body, I'm able to hold in my body heat."
So, when the temperature of a container with particles decreases, the particles move slower and stay closer together.
I hope this helps! :)