Examples of Physical and Chemical Changes

Are you unclear about the difference between physical changes and chemical changes and the way to tell them apart? In a nutshell, a chemical change creates a new substance, while a physical change doesn't. A material may alter forms or shapes while going through a physical change, however no chemical reactions happen and no new compounds are produced.



  

Examples of Physical Changes:

melting an ice cube

crumpling a sheet of paper

breaking a bottle

casting silver in a mold

Examples of Chemical Changes:

dissolving salt in water

burning wood

digesting food

mixing acid and base

Compare and Contrast Physical and Chemical Changes

1. Physical changes modify physical properties of a substance. These contain melting, breaking and dissolving. Generally, physical changes are effortlessly reversible. The physical look may change, however the chemical composition stays the same. Chemical changes, however, change the substance into something totally different. For instance, when something rusts, the metal reacts with oxygen, building a compound that looks like neither the metal nor oxygen: rust

2. As you go from gas to liquid to solid, movement on the molecular level reduces. Thus, the molecules in gas move all over, however in the molecules in a solid stay mostly in the identical place.

3. In a chemical reaction, energy can either be absorbed (endothermic rxn) or released (exothermic rxn).