16. A compound consists of two or more elements put together by chemical means. Its molecules are all identical. The compound always contains the same ratio of atoms. A mixture consists of one or more different elements combined physically. These can then be separated - physically also. They retain many of the properties of the original elements. The false statement among the following is, A very pure substance is homogeneous in nature B) In compounds the constituents do not retain their original properties. C) The constituents of a mixture can be separated by physical method D) During formation of mixture there is a change in molecular composition
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- Two or more elements combined into one substance through a chemical reaction, such as water, form a chemical compound. ... A common example of a chemical substance is pure water; it always has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory.
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Two or more elements combined into one substance through a chemical reaction, such as water, form a chemical compound. ... A common example of a chemical substance is pure water; it always has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory.
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