Answer
a) Changing from solid black carbon and colourless oxygen to colourless carbon dioxide is a CHEMICAL PROPERTY
b) The colors and the state the substances are chemical properties
Work Step by Step
\ltIn (a) above burning of charcoal is chemical change since it involves combustion.. combustion involves burning of charcoal in presence of oxygen to produce carbon dioxide ..The process is exothermal which means release of energy and hence heat all of which are forms of a chemical reaction.Also a new product is formed which is carbon dioxide telling us that this cannot be a physical property
In (b) the colours and the state of of the substances are chemical properties since they indicate to us that a new substance has been formed like the burning of black solid charcoal in presence of colourless oxygen to produce colourless carbon dioxide..These properties help us to see a new product has been formed hence chemical properties
