SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Always True
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Sometimes True
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Never True
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None of the above
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Detailed explanation-1: -A substance is a type of matter WITHOUT a fixed composition. AN ION is a substance in which the atoms of two or more elements are combined in a fixed proportion. A HETEROGENEOUS mixture contains two or more gaseous, liquid, or solid substances blended evenly throughout. Substances are either elements or MIXTURES.
Detailed explanation-2: -A pure substance always has a definite and constant composition. A mixture is a physical combination of two or more pure substances in which each substance retains its own chemical identity.
Detailed explanation-3: -Thus, the given statement is True. I.e., Both elements and compounds have fixed composition and a definite set of properties.
Detailed explanation-4: -A pure substance is homogeneous but does not have a fixed composition.
Detailed explanation-5: -Mixture Have variable composition and can be separated into component parts by physical methods. Mixtures contain more than one kind of molecule, and their properties depend on the relative amount of each component present in the mixture.