EVERYDAY SCIENCE

Detailed explanation-1: -Chemical Change. Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.

Detailed explanation-2: -Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

Detailed explanation-3: -In a physical change the nature of the substance, the particles of which it is composed and the numbers of particles remain unchanged. In a chemical change the properties of the new substances are different from the original, the particles are different and the number of particles can change.

Detailed explanation-4: -physical property : Any characteristic that can be determined without changing the substance’s chemical identity. chemical property : Any characteristic that can be determined only by changing a substance’s molecular structure.