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Substance and its Nature Video Lecture | General Awareness for SSC CGL

FAQs on Substance and its Nature Video Lecture - General Awareness for SSC CGL

1. What is a substance in chemistry?

Ans. In chemistry, a substance is a form of matter that has a definite composition and distinct properties. It can be a single element, like oxygen or gold, or a compound, like water or sodium chloride. Substances are categorized based on their physical and chemical properties.

2. What are the different types of substances?

Ans. Substances can be classified into two main categories: pure substances and mixtures. Pure substances consist of only one type of particle and have uniform properties throughout, while mixtures contain two or more different substances that retain their individual properties. Mixtures can be homogeneous (uniform composition) or heterogeneous (non-uniform composition).

3. What is the difference between an element and a compound?

Ans. An element is a pure substance that cannot be broken down into simpler substances by chemical means; it consists of only one type of atom. A compound, on the other hand, is a substance formed when two or more elements chemically combine in fixed proportions. Compounds can be broken down into their constituent elements through chemical reactions.

4. How do the physical properties of a substance differ from its chemical properties?

Ans. Physical properties are characteristics that can be observed or measured without changing the substance's identity, such as color, melting point, and density. Chemical properties, however, describe how a substance interacts with other substances and how it changes during chemical reactions, such as reactivity, flammability, and acidity.

5. Why is understanding substances important in chemistry?

Ans. Understanding substances is crucial in chemistry because it helps scientists and students predict how different materials will behave in various environments and reactions. This knowledge is fundamental for applications in fields like medicine, engineering, environmental science, and materials science, enabling the development of new materials and technologies.

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Oct 06, 2025 Last updated

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