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Mindmap: Is matter around us Pure | Science Class 9

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1. Is matter around us pure?
Ans. Yes, matter around us can be classified into pure substances and mixtures. A pure substance is made up of only one type of particle, either an element or a compound, while a mixture consists of two or more substances physically combined.
2. How can we distinguish between pure substances and mixtures?
Ans. Pure substances have a fixed composition and properties throughout, whereas mixtures can vary in composition and have properties that depend on the proportion of each substance present. This can be determined through techniques such as chromatography, distillation, or by analyzing their melting and boiling points.
3. What are some examples of pure substances?
Ans. Examples of pure substances include elements like oxygen, gold, and hydrogen, as well as compounds like water, salt, and glucose. These substances have specific chemical formulas and consistent properties.
4. What are some examples of mixtures?
Ans. Mixtures can be classified into homogeneous mixtures and heterogeneous mixtures. Homogeneous mixtures have a uniform composition throughout, such as saltwater or air, while heterogeneous mixtures have visibly different components, like a salad or a bowl of cereal.
5. Can mixtures be separated into their individual components?
Ans. Yes, mixtures can be separated into their individual components through various methods. For example, filtration can be used to separate solids from liquids, distillation can separate liquids with different boiling points, and magnetism can separate magnetic substances from non-magnetic ones.
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