science - the particle model

Question 1

what are the states of matter and their properties?

Answer 1

solid - relatively rigid, definite volume and shape. In a solid, the atoms and molecules are attached to each other.

Liquids – definite volume but able to change shape by flowing. In a liquid, the atoms and molecules are loosely bonded.

Gases – no definite volume or shape., liquid and gas

Question 2

what is diffusion?

Answer 2

process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.

Question 3

what is drag?

Answer 3

Drag is a mechanical force. It is generated by the interaction and contact of a solid body with a fluid

Question 4

Why do solids expand when they are heated?

Answer 4

The particles vibrate more and take up more space.

Question 5

What happens to the density of a block of iron when it is heated?

Answer 5

It decreases, because the volume increases.

Question 6

When liquid water changes into steam it is

Answer 6

evaporating.