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Introduction - Is matter around us Pure? , Science, Class 9 Video Lecture
FAQs on Introduction - Is matter around us Pure? , Science, Class 9 Video Lecture
| 1. Is matter around us pure? |  |
Ans. Yes, matter around us can be classified as either pure substances or mixtures. Pure substances are made up of only one type of particle and have a fixed composition, while mixtures are made up of two or more substances that are physically combined and can be separated by physical means.
| 2. What are pure substances? | |
Ans. Pure substances are materials that are composed of only one type of particle or molecule. They have a fixed chemical composition and distinct physical properties. Examples of pure substances include elements and compounds.
| 3. How can mixtures be separated? | |
Ans. Mixtures can be separated by various physical methods depending on the properties of the substances involved. Some common separation techniques include filtration, distillation, evaporation, chromatography, and magnetism.
| 4. What is the difference between a compound and a mixture? | |
Ans. A compound is a pure substance that is made up of two or more different elements chemically combined in a fixed ratio. It has a specific chemical formula and its properties are different from the elements it is composed of. On the other hand, a mixture is a combination of two or more substances that are physically mixed together and can be separated by physical means.
| 5. Can impure substances be considered mixtures? | |
Ans. Yes, impure substances can be considered mixtures. An impure substance is a substance that contains other substances mixed with it, which may alter its properties. These impurities can be separated from the substance by physical means, indicating that it is a mixture rather than a pure substance.
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