Determine whether each of the following are physical or chemical changes.
A liquid mixture is heated to boiling point and collected by a condenser. The condenser cools the gas and returns it to liquid state.
Food coloring is added to a clear liquid turning it red.
A silver metal is burned and leaves behind a white powder.
Brue crystals are crushed and ground to a fine blue powder.
While a blue powder is heated it emits a strong smelling gas. After being heated, the blue powder has turned white.
A strong smelling liquid is vaporized.