Several materials are available to be used for a sculpture. They are placed outside where they are exposed to the heat of the sun and acid rain. Their mass and appearance were recorded from time to time. Which of the following statement could be used as a basis to select the best material to be used for the sculpture?

The following are properties of chlorofluorocarbons (pollutants that destroy the ozone layer). Classify each as physical or chemical.

a. tasteless

b. odorless

c. non-flammable

d. unreactive

e. split apart in the presence of ultra-violet radiation

Complete the flowchart below by labeling the transitions as physical or chemical change.

Identify whether the following is a physical or chemical change: 

a) Rusting iron bar

b) Melting a butter

c) Dissolving sugar in water

d) Burning a log of wood

e) Tearing a piece of paper