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What are Chemical Changes? Video Lecture | Science Class 7

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FAQs on What are Chemical Changes? Video Lecture - Science Class 7

1. What are chemical changes?
Ans. Chemical changes refer to the process in which one or more substances combine or break apart to form new substances with different properties. These changes usually involve a chemical reaction, where the bonds between atoms are rearranged.
2. What are some examples of chemical changes?
Ans. Some examples of chemical changes include burning wood, rusting of iron, cooking food, digesting food in our body, and the souring of milk. In all these examples, new substances are formed with different properties than the original substances.
3. How can you distinguish between chemical and physical changes?
Ans. Physical changes involve a change in the physical properties of a substance, such as its shape, size, or state of matter, without forming new substances. On the other hand, chemical changes involve the formation of new substances with different properties. One way to distinguish between the two is by observing if the change is reversible or irreversible. Physical changes are usually reversible, while chemical changes are often irreversible.
4. Can you give an example of a chemical change that occurs in everyday life?
Ans. One example of a chemical change that occurs in everyday life is the process of baking a cake. When the cake batter is heated in the oven, a chemical reaction takes place between the ingredients, resulting in the formation of a new substance with a different texture, taste, and appearance.
5. Why are chemical changes important?
Ans. Chemical changes are important because they allow us to create new substances with desired properties for various purposes. They are essential in industries such as pharmaceuticals, agriculture, and manufacturing. Additionally, chemical changes also play a crucial role in biological processes, such as digestion and respiration. Understanding chemical changes helps us comprehend the world around us and develop new technologies and materials.
145 videos|326 docs|55 tests

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