Assume you have several materials available to build a sculpture for the city hall. When the sculpture is placed outside in the open, the material it is built from may undergo unwanted changes, such as corrosion and erosion.

Which of the following statements best describes the characteristics of the material chosen for the sculpture that would make it resistant to these changes?

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