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Hence, in a chemical reaction, the total mass of reactants should be equal to the total mass of the products. It means that the total number of atoms of each element should be equal on both sides of a chemical equation. Hence, it is for this reason that chemical equations should be balanced.
Why is respiration considered an exothermic reaction? Energy in our body is obtained from the food we eat. During digestion, large molecules of food are broken down into simpler substances such as glucose. Glucose combines with oxygen in the cells and provides energy. The special name of this combustion reaction is respiration. Since energy is released in the whole process, it is an exothermic process. Why are decomposition reactions called the opposite of combination reactions?
Decomposition reactions are those in which a compound breaks down into two or more substances. These reactions require a source of energy to proceed. Thus, they are the exact opposite of combination reactions in which two or more substances combine to give a new substance with the release of energy. Why do we apply paint on iron articles?
Iron articles are painted because applying paints prevents them from rusting. When painted, the contact of iron articles from moisture and air is cut off.
Hence, rusting is prevented their presence is essential for rusting to take place. Oil and fat containing food items are flushed with nitrogen. Nitrogen is an inert gas at room temperature and does not easily react with oil and fat containing items. On the other hand, oxygen reacts with food substances and makes them rancid. Thus, bags used in packing food items are flushed with nitrogen gas to remove oxygen inside the pack.
When oxygen is not present inside the pack, rancidity of oil and fat containing food items is avoided. Olfactory indicators are substances which have different odour in acid and base solutions. For example, vanilla essence has characteristics pleasant smell in acid solution and no smell in alkali solution.
Tap water contains some impurities in the forms of salts. Due to presence of salts, it conducts electricity. Distilled water is free from all kinds of salts and hence does not conduct electricity.
When an acid is mixed with water, there is evolution of large amount of heat. Therefore, acid is slowly added to water. If on the other hand, water is added to acid, it might spill on your body and clothes due to explosion and evolution of sudden and large amount of heat. The rain water collected from city B is more acidic. Sugar present in chocolates and sweets gets broken to acids by bacteria present in the mouth.
This lowers the pH in the mouth. Tooth enamel is made up of calcium phosphate, which gets corroded when the pH in the mouth is below 5. To prevent tooth enamel from decay, toothpaste is used because it is alkaline and neutralises the acid produced in the mouth and helps to prevent lowering of pH in mouth. Bleaching powder is soluble in water. However, commercial samples of bleaching powder contains slaked lime that does not react with chlorine gas during the manufacture of bleaching powder.
The insoluble part of bleaching powder is this white solid, i. Question 1: What is a neutralization reaction? Give some examples. Answer 1: When the effect of a base is nullified by an acid and vice versa, it is called neutralization reaction.
Question 2: An alkali is an important base used for the laboratory work. Name the base and state how it can be prepared from common salt? What is this process called? Answer 2: An important alkali commonly needed for laboratory work is sodium hydroxide. It can be prepared from sodium chloride by the process of electrolysis. This is called chlor-alkali process. Electrolysis of aqueous solution of sodium chloride: When electricity is passed through an aqueous solution of sodium chloride commonly called brine, it decomposes into chloride and sodium.
Sodium is collected at the cathode where it reacts with water to form sodium hydroxide. Chlorine is formed at the anode and is collected as a gas. Question 1: a How does baking soda helps to make cakes and bread soft and spongy? OR Give reason: cake rise on adding baking powder. Answer 1: a On heating , sodium bicarbonate decomposes to produce carbon dioxide. This causes biscuits and cakes etc. The other constituents act as preservatives.
Question 2: Why does bleaching powder smell strongly of chlorine? Answer 2: Bleaching powder smells strongly of chlorine because it slowly reacts with carbon dioxide of air to evolve chlorine gas.
Define indicators. Name two natural indicators obtained from plants. What are antacids? What are olfactory indicators? Give an example. Tap water conducts electricity whereas distilled water does not. While diluting an acid, why is it recommended that the acid should be added to water and not water into the acid?
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