FAQs on Characteristics and Properties of Matter Video Lecture - Class 9
1. What are the characteristics of matter? |
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Ans. Matter has several characteristics, including mass, volume, density, and physical and chemical properties. Mass refers to the amount of matter in an object, while volume is the amount of space it occupies. Density is the mass per unit volume of a substance. Physical properties of matter include color, shape, size, and texture, while chemical properties describe how matter interacts with other substances through chemical reactions.
2. What are the properties of matter? |
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Ans. Matter has various properties that can be classified into two categories: physical properties and chemical properties. Physical properties include characteristics such as color, odor, density, melting point, boiling point, and solubility. Chemical properties, on the other hand, describe how matter behaves in the presence of other substances and can be observed through chemical reactions, such as flammability or reactivity with acids.
3. What is the difference between physical and chemical properties of matter? |
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Ans. Physical properties describe the characteristics of matter that can be observed or measured without changing its composition. These properties include color, shape, size, density, and boiling point, among others. Chemical properties, on the other hand, describe how matter interacts with other substances and can only be observed through chemical reactions. These properties involve the transformation of matter and may result in the formation of new substances.
4. How can the density of a substance be calculated? |
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Ans. The density of a substance can be calculated by dividing its mass by its volume. The formula for density is Density = Mass / Volume. The mass is usually measured in grams (g) and the volume in cubic centimeters (cm³) or milliliters (mL). The resulting value of density will have units of grams per cubic centimeter (g/cm³) or grams per milliliter (g/mL).
5. What are some examples of physical and chemical properties of matter? |
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Ans. Examples of physical properties include color (e.g., red, blue), odor (e.g., fragrant, pungent), density (e.g., light, heavy), boiling point (e.g., low, high), and solubility (e.g., soluble, insoluble). Examples of chemical properties include flammability (e.g., combustible, non-combustible), reactivity with acids (e.g., reacts vigorously, does not react), and ability to rust or corrode (e.g., rusts easily, does not rust).