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In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
So, the difference between chemical and physical changes is that a chemical change alters the chemical composition of matter, while a physical change does not. A chemical change produces a new substance, while a physical change alters the form of matter but not its chemical identity.
Remember that a physical change is a change in properties such as texture, shape, or state, while a chemical change represents the formation of a new substance after atoms are rearranged in a chemical reaction.
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting.
Chemists make a distinction between two different types of changes that they study—physical changes and chemical changes. Physical changes are changes that do not alter the identity of a substance. Chemical changes are changes that occur when one substance is turned into another substance.
Chemical changes are different from physical changes. During a chemical change, the molecules of a material do change. The material becomes something new and different.
Chemical changes are very different from physical changes. A chemical change takes place when the composit ion of a substance is altered. This requires the breaking and forming of chemical bonds during a reaction.