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प्रश्न
What is meant by a substance?
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उत्तर
A substance is a kind of matter that is made up of only one type of particle (either atoms or molecules). It has a definite composition and distinct properties. A substance may be an element (e.g., oxygen, iron) or a compound (e.g., water, carbon dioxide). For example, water is a pure substance because it contains only one type of molecule, H₂O.
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संबंधित प्रश्न
State three reasons why you think air is a mixture and water is a compound.
Name one pair of substances whose mixture can be separated by fractional distillation.
Name any two solid substances whose mixture can be separated by sublimation.
Give two examples.
Homogeneous mixture
Tick (√) the correct alternative from the choice given for the following statement:
A heterogeneous mixture is
Tick (√) the correct alternative from the choice given for the following statement:
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State whether the following statement is true or false. If false write – the correct statement.
Components in a mixture can be separated by physical and chemical methods.
Sucrose (sugar) crystals obtained from sugarcane and beetroot are mixed together. Will it be a pure substance or a mixture? Give reasons for the same.
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LPG is ______ gas.
