HMH Unit 2.2 Day Two pgs 109-112

You have already learned about several different properties that matter can have.

Another one to add to the list is conductivity ability to move heat or electricity.

Materials that let heat or electricity travel through them easily are conductive. Most things that are conductors are made of metal, although other materials can be conductive as well.

Materials that do not conduct heat or electricity are called insulators.

Insulation is often made of cloth, plastic, or rubber. In fact have you ever noticed what covers the electric power cords of electric devices? The wires inside are covered with plastic to keep the electricity and heat form flowing out and starting a fire.

Matter has so many different properties it is hard to keep track.

Another property of matter you should consider is the ability to dissolve in water, called solubility.

When something dissolves, it may look like one substance disappeared, but those particles are still there!

They are just too small to be seen. For example, f you let salt water evaporate, you will be left with a pile of salt.

Think back to the activity you did with the salt and the water. After you stirred the water with the salt in it, was the salt still there?

You could not see it, but it was still in the water. it had dissolved.