Material changes:

Cannot be changed back to what it was before:

• Reversible

• Irreversible

Can be changed back to what it was before:

• Reversible

• Irreversible

Burring a match is:

• A reversible change

• An irreversible change

Burning wood on a fire:

• Reversible change

• Irreversible change

Ice melting and refreezing is:

• A reversible change

• An irreversible change

A material or piece of equipment with holes in it that will only allow substances of a certain size to go through the holes.

• Windpipe

• Stomach

• Sieve

• Circuit

Rice and flour mixture can be separated by:

• Sorting

• Sieving

It cannot be separated by by sieving or sorting:

• Rice and flour

• Salt and sand

• Bean and marbles

• Tea leaves and sugar

A solid that dissolves in a liquid is:

• Soluble

• Insoluble

Substances that do not dissolve in liquids are:

• Soluble

• Insoluble