Question

hi mam please give a difine of physical and chemical change

Answer 1

Answer:

Physical changes. Chemical changes.

Explanation:

Physical changes. Chemical changes. When a substance undergoes a physical change, its composition remains the same but there is rearrangement of molecules. When a substance undergoes a chemical change, there is an entire change in its molecular composition, which results in the formation of new substances.

Answer 2

Also, refer to your school book once, its answer may be simpler and more convenient for your exams.  

Physical Change

A physical change is a type of change where the physical properties of matter change. A change of state of matter, change in colour, odour, solubility, etc. all are examples of physical change. During a physical change, neither the composition nor the chemical nature of matter is changed.

Chemical Change

A Chemical change occurs 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. Some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions.