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NCERT Solutions for Class 10 Science| Updated

Answer: i a and b. Answer: d Question. Tick the correct answer. Answer: a Question. Why should chemical equation be balanced? Answer: An equation having an equal number of atoms of each element ncert solutions for class 10th science chapter 1 an both the sides is called a balanced chemical equation.

According to this law, mass can neither be created nor destroyed. In other words, the total mass of reactants should be equal to the total mass of the products in a chemical equation.

Therefore, the total necrt atoms of each element participating in the reaction must be equal on both sides of the chemical equation i.

Hence, it is for the above reason that a chemical equation should be balanced. Give examples. Answer: Exothermic reactions: Those reactions ncegt which energy is released in the form of heat are called exothermic reactions. Examples - 1 All combustion reactions e. The decomposition of organic matters into ncert solutions for class 10th science chapter 1 an is an example of exothermic reaction. Endothermic reactions: Those reactions in which energy is absorbed are called endothermic reactions.

Examples -also, the reaction of photosynthesis - Question. Answer: For the sustenance of life we require energy. We obtain this energy from our food. In the process of digestion, food molecules get converted into simpler substances such as, glucose. Then glucose combine with oxygen and provide energy to our body. The whole process is known as respiration.

As because, energy is released during soultions process of respiration, so it is considered an exothermic reaction. Write equations for these reactions. Answer: Decomposition reactions are those reactions in which a compound is broken into two or more new compounds. Combination reactions are those reactions in which two substances are combined to form a new substance.

Answer: In ncert solutions for class 10th science chapter 1 an reactionone element from its salt is displaced by a more reactive element e. Sceince down the reaction involved. Answer: When copper is mixed in silver nitrate solution, it displaces the silver because copper is more reactive than silver. Explain by giving examples. Answer: The reactions in which a precipitate is formed are called precipitation reactions.

Examples: 1. Oxidation b. Reduction Answer: a Oxidation : The reactions in which gain of oxygen takes place are called oxidation. Examples - 1. When it is heated in air, it becomes black due to the deposit of copper oxide. Answer: We apply paint on iron articles to prevent them from corrosion. Paint prevents iron from coming in contact with air and moisture.

Thus, painting prevents rusting of iron articles. Answer: Nitrogen being an inert gas does not react easily with the oil and fat present in the food substances. But oxygen reacts easily with the food substances and makes them rancid. It is because of this reason that food items containing oil and fat are flushed with nitrogen gas before their packing to remove oxygen present ncert solutions for class 10th science chapter 1 an the pack.

Generally, metals get corroded more easily. For example, iron in the chaptet of moisture, reacts with oxygen air to form hydrated iron oxide also called Rust. Rancidity can be prevented by: 1.

Storing food in refrigerators or in air-tight containers. Flushing oil and fat containing food items with nitrogen tor their packing. By adding anti-oxidants. Chapter 1, Chemical Reactions and Equations.

The above reaction is an example of a. Answer: d. Answer: a. Exothermic reactions: Those reactions in which energy is released in the form of heat are called exothermic reactions. Examples. Combinations are generally exothermic in nature. For example. In above examples, both the reactions are same but show opposite directions, so decomposition reaction is called the opposite of combination reaction. In double displacement reactionexchange of ions takes place between two reactants to form new products.

In this reaction, BaSO4 is obtained as precipitate. Chwpter calcium carbonate is obtained as precipitate. Rancidity can be prevented by:. Next Prev Post. Previous Next Post. Anonymous June 23, at PM. Unknown April 13, at PM. Unknown May 15, at PM. June 17, at PM. Rahul Narisettti July 20, at AM.

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In human beings, the food eaten is broken down by various steps along the alimentary canal and the digested food is absorbed in the small intestine to be sent to all cells in the body. The methods to prevent rancidity are:. What happens when ferrous sulphate crystals are heated? Some major topics covered in this chapter are:. But, with help of technology, it can converted into Bio-gas, which is an efficient and pollution free fuel. A generator converts mechanical energy into electrical energy.

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