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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
Classify each of the following as a homogeneous or heterogeneous mixture.
Soda water, wood, air, soil, vinegar, filtered tea.
Define a mixture. Give two points of evidence to show that sugar solution is a mixture.
How will you separate a mixture of cooking oil (groundnut oil) and water ?
Give reason:
Why do sugar and water retain their individual properties in a sugar solution?
Give reason:
Why sulphur does dissolve when carbon disulphide is added to a mixture of iron and sulphur but not when it is added to iron sulphide?
Fill in the blanks
___________is a process to obtain a very pure form of a solid dissolved in a liquid.
Tick (√) the correct alternative from the choice given for the following statement:
A set of the mixture is
How will you separate a mixture containing saw dust, naphthalene and iron filings?
Suggest separation technique(s) one would need to employ to separate the following mixture.
Potassium chloride and ammonium chloride
What would you observe when
a mixture of iron filings and sulphur powder is heated strongly
