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Is Matter Around Us Pure 007 Video Lecture - Class 11

FAQs on Is Matter Around Us Pure 007 Video Lecture - Class 11

1. What is the concept of matter in chemistry?

Ans. Matter refers to anything that occupies space and has mass. In chemistry, matter is classified into two types: pure substances and mixtures. Pure substances are further categorized into elements and compounds, while mixtures are composed of two or more substances that are physically combined but can be separated through physical methods.

2. What is the significance of purity in matter?

Ans. Purity is an important characteristic of matter as it determines the composition and quality of a substance. Pure substances have a definite and fixed composition, meaning they are made up of only one type of particle (either atoms or molecules). Understanding the purity of matter is crucial in various fields such as pharmaceuticals, food industry, and research, as impurities may affect the desired properties or effectiveness of a substance.

3. How can we distinguish between pure substances and mixtures?

Ans. Pure substances are characterized by having a fixed composition and distinct set of properties. They cannot be separated into other substances by physical methods. On the other hand, mixtures are composed of two or more substances that are physically combined and can be separated by physical methods such as filtration, evaporation, or distillation. Mixtures exhibit properties that are a combination of the properties of their components.

4. What are some examples of pure substances and mixtures in our daily life?

Ans. Examples of pure substances include elements such as oxygen, gold, and hydrogen, as well as compounds like water (H2O) and sodium chloride (NaCl). Mixtures, on the other hand, are commonly encountered in our daily lives. Some examples include air (a mixture of gases), saltwater (a mixture of salt and water), and coffee (a mixture of coffee beans and water).

5. How can we determine the purity of a substance in the laboratory?

Ans. There are various methods to determine the purity of a substance in the laboratory. One common technique is chromatography, which separates the components of a mixture based on their different affinities to a mobile phase and a stationary phase. Another method is spectroscopy, where the interaction of matter with electromagnetic radiation is used to identify and quantify the substances present in a sample. Additionally, techniques like melting point determination and elemental analysis can also be employed to assess the purity of a substance.

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Oct 17, 2025 Last updated

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