Question

In an attempt to characterize a substance, a chemist makes the following observations: The substance is a white, lustrous material that melts at 649 Celsius and boils at 1105 Celsius. Its density at 20 Celsius is 1.782 g/mL. It burns in air, producing an intense white light, and it reacts with chlorine to give a brittle white solid. It can be pounded into thin sheets, and the substance is a good conductor of electricity. Identify as many physical and chemical properties, and physical and chemical changes as possible for this substance from the passage. The changes can be observed or implied. In the first answer box, write "Physical Properties" and then list the physical properties. In the second box, write "Chemical Properties" and then list the chemical properties. In the third box, write "Physical Changes" and then list the physical changes. In the fourth box, write "Chemical Changes" and then list the chemical changes.

Answer 1

	Box 1:   Physical Properties: These are easily observable and independent of amount of substance 1. Color: White 2. Appearance: Lustrous 3. Melting Point is 649 Celsius 4. Boiling Point is 1105 Celsius 5. Density is 1.782 g/ml 6. Good Conductor 7. Pounded into thin sheet – Malleability
		Box 2:   Chemical Properties: Lead to change in composition as well as characteristics of the substances 1. Burning in air, produces an intense white light (involves chemical change) 2. Reacts with chlorine gas to give a brittle, crystalline solid. (involves chemical change/formation of new compound)
		Box 3:   Physical Change: Change in Phase/shape (Physical state) 1. Melting Point is 649 Celsius: Melting will change the physical state of substance from solid to liquid. 2. Boiling Point is 1105 Celsius: Boiling will change the physical state of substance from liquid to gas. 3. Pounded into thin sheet – Malleability (Change the Shape of the substance.
		Box 4:   Chemical Change: Composition as well as characteristics of the substances 1. It burns in air, producing an intense white light (involves chemical change) 2. It reacts with chlorine gas to give a brittle, crystalline solid. (involves chemical change)