The form of change in which a material’s physical properties change. Its shape, state of matter, colour, density, scale, odour, and solubility may all be altered. Only the functional properties of the substances are altered during this phase. These modifications have little impact on the chemical structure or internal properties of the substance. Although the atoms are reorganised, the structure stays the same. The outward improvements are easy to notice. 

Dissolving sugar in water, sublimating dry ice, crushing a paper, melting wax, boiling water, melting ice, and so on are several instances of physical changes.

A chemical change is characterised as a change in the molecular structure that results in the creation of a new substance. A new substance is produced as a consequence of chemical modifications. Chemical transitions are inevitable and lasting. It shows that modifying or adjusting the experimental modifications would not undo the chemical change. During a chemical change, the mass of the material changes. The mass is either inserted or deleted. Energy shifts arise as a change in a chemical reaction. The breaking of old bonds in reactants and forming new bonds in products need different amounts of energy. When energy is emitted, the reaction is considered an exothermic reaction; when energy is consumed, it is called an endothermic reaction.

• Wood or paper burning
• Camphor burning
• Milk sourness 
• Candles burning
• The process of food digestion

Physical ChangeChemical ChangeDespite the fact that a substance’s molecules are rearranged as it undergoes a physical change, the structure stays the same. A substance’s molecular structure is completely altered as it undergoes a chemical change. As a result, chemical transformations result in the creation of new compounds. Physical change is a temporal change. A chemical change is a long-term change. Only physical attributes, such as form and scale, are affected by a physical change. Chemical transformations change the substance’s physical and chemical characteristics, as well as its structure. A physical change requires little or no energy absorption. Absorption and evolution of energy occur during a chemical reaction. Freezing water, melting wax, boiling water, and other physical changes are examples of physical change. Food absorption, coal combustion, rusting are chemical change examples. Physical changes, in general, do not necessitate the creation of energy. The processing of energy is typically involved in chemical changes (which can be in the form of heat, light, sound, etc.) A physical change should not result in the formation of new material. One or more new substances are often produced as a chemical change occurs (s). The physical change is reversible, implying the initial material may be restored. Chemical processes are permanent, which means that the initial product cannot be retrieved.

In this chapter, we learned about the basic concepts of physical and chemical changes. We were taught about the Physical And Chemical Changes Classification With Examples. We also learnt about the differences in physical and chemical changes. We can use this knowledge to further enhance the understanding of reactions that take place around us.

1. What is a chemical transformation?
2. A chemical transformation happens where the composition of matter but not its chemical identity. Fouling is an example of a chemical transition. Examples of simmering, heat and freezing.
3. Give an example of an irreversible change.
4. Oxidation of Iron is a chemical process in which rearrangement of atoms and modification of the chemical properties creates a new substance. In the end, it’s an irreversible change.
5. Melting zinc – is it a chemical change?
6. A chemical reaction occurs as one or more substances are converted to other compounds. No product has been produced. If it absorbs heat, the mixture can turn into zinc sulfide (ZnS). 
7. A chemical change is which process?
8. In a chemical change, we get new material, called a chemical synthesis, or an illustration of chemical decomposition. These processes are known as chemical reactions, which are almost often irreversible. 
9. What’s the importance of a chemical change?
10. Chemical processes show matter’s properties. We can figure out its properties by seeing how it reacts with other matter. It is possible to recognise and group unknown species by using these properties. Chemical reactions enable us to perceive matter. We research matter-to-matter experiences to understand a substance’s properties.