In what different classes of change can you put the burning?
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The tearing of a sheet of paper in different pieces is a physical change, whereas burning it is a chemical change.
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The spongy tissue that forms air spaces between the cells of leaves, stems and roots of some plants are called aerenchyma cells. It helps in the gaseous exchange between the shoot and the root and also provides buoyancy to the aquatic plants.James Chadwick
In 1932, the physicist James Chadwick conducted an experiment in which he bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium.
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