Distinguish between -1. metals and non metals 2. Physical change and chemical change 3. Natural change and man-made change
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Answer:
nonmetals are a class of chemical elements whose chemical and physical properties contrast with those of metals. Most nonmetals gain electrons when reacting with a metal, form an acid if combined with oxygen and hydrogen, and are poor conductors of heat and electricity.
A chemical change is always accompanied by one or more new substance(s). Physical change is easily reversible i.e original substance can be recovered. Chemical changes are irreversible i.e. original substance cannot be recovered.
The changes which are brought about by nature itself and are not under the control of humans are called natural changes. The changes which are brought about by humans are called man-made changes. 2. Examples- change of season, tides in the sea, aging of plants, etc.
Answer:
nonmetals are a class of chemical elements whose chemical and physical properties contrast with those of metals. Most nonmetals gain electrons when reacting with a metal, form an acid if combined with oxygen and hydrogen, and are poor conductors of heat and electricity.
A chemical change is always accompanied by one or more new substance(s). Physical change is easily reversible i.e original substance can be recovered. Chemical changes are irreversible i.e. original substance cannot be recovered.
The changes which are brought about by nature itself and are not under the control of humans are called natural changes. The changes which are brought about by humans are called man-made changes. 2. Examples- change of season, tides in the sea, aging of plants, etc.
Explanation:
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