Question

ANSWER THE FOLLOWING QUESTIONS :-

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Answer 1

Answer:

reversible change:-A reversible change is a chemical change where no new materials are created and the original material can be recovered. Examples include freezing

brittle substance:-Brittle materials include glass, ceramic, graphite, and some alloys with extremely low plasticity, in which cracks can initiate without plastic deformation and can soon evolve into brittle breakage

human made changes:-

Melting of glaciers due to global warming. Air pollution due to smoke created by burning of fuels and automobiles. Water Pollution due to draining of chemicals and wastes in the water bodies. Floods and droughts due to deforestation

physical change:-Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.