Answer
Physical properties of iodine: solid; blue-back crystals; crystals vaporize to a violet-colored gas;
Chemical properties of iodine: combines with many metals; aluminum combines with iodine to give aluminum iodine.
Work Step by Step
Physical properties describe the properties of the matter while it retains its chemical identity.
“Iodine is solid” is a statement that describes the normal physical state of iodine.
“Iodine has blue-black crystals” is a statement that describes the color of iodine crystals. No chemical reaction is involved.
“Iodine crystals vaporize to a violet-colored gas”. This statement describes the process of evaporation that changes the form of the matter but do not bring any change to the chemical identity.
Chemical properties of iodine:
Iodine combines with many metals. This statement describes chemical property of iodine. To combine with many metals means that iodine enters in chemical reaction with these metals and new substances are formed.
Aluminum combines with iodine to give aluminum iodine. This statement describes the chemical property of iodine to combine with aluminum. As a result iodine do not retain its chemical identity as a new substance ( aluminum iodine) is formed.
