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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.
संबंधित प्रश्न
Compare the properties of metals and non-metals with respect to
- alleability
- ductility
- electrical conductivity.
What is a mixture ? Give two example of mixtures.
Name the process you would use to separate ammonium chloride from a mixture of sodium chloride and ammonium chloride.
Select homogeneous and heterogeneous mixtures from the following:
The salt solution, petrol, and water, sand, and charcoal, alcohol and water, air dissolved in water, air, seawater, fruit juices, mist, brass.
Define the following:
Alloy
Give reason:
Why do sugar and water retain their individual properties in a sugar solution?
Write “true” or “false” for the following statement
Air can be separated from water by filtration.
Air is a mixture. Justify.
The ‘sea-water’ can be classified as a homogeneous as well as a heterogeneous mixture. Comment.
Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain.
