Explain the following terms with one example each corrosion and rancidity

Question: Explain the following terms with one example each corrosion and rancidity? Corrosion refers to the deterioration of materials, usually metals, due to a chemical reaction with their environment. One example of corrosion is the rusting of iron. When iron is exposed to oxygen and water, a chemical reaction occurs that causes the iron to slowly break down and form a reddish-brown coating of iron oxide. Rancidity refers to the spoilage of food due to the breakdown of fats and oils. One example of rancidity is when vegetable oil goes bad. When vegetable oil is exposed to air and light, the fats and oils in the oil start to break down and form unpleasant odors and flavors. The oil may become sticky or develop a rancid taste and smell.

Corrosion is defined as a process where materials, usually metals, deterioate as a result of a chemical reaction with air, moisture, chemicals, etc For example, iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide `4Fe +3O_(2)+nH_(2)O rarr 2Fe_(2)O_(3). nH_(2)O` Rancidity is the process of oxidation of fats oils that can be easily noticed by the change in taste and smell is known as rancidity For exampl, the taste and smell of butter changes when kept for long.

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Page 6 Q1 Why should a magnesium ribbon be cleaned before burning in air? Answer. Magnesium is a very reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned with sandpaper to remove this layer so that the underlying metal can be exposed to air. Q2 Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen Q3 Write a balanced chemical equation with state symbols for the following reactions. (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water. Page 10 Q1 A solution of a substance ‘X’ is used for whitewashing. (i) Name the substance ‘X’ and write its formula. (ii) Write the reaction of the substance ‘X’ named in (i) above with water. Answer. (i) The substance ‘X’ is calcium oxide. Its chemical formula is CaO. (ii) Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime). Q2 Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount col...

Question: Explain the following terms with one example each corrosion and rancidity? Corrosion refers to the deterioration of materials, usually metals, due to a chemical reaction with their environment. One example of corrosion is the rusting of iron. When iron is exposed to oxygen and water, a chemical reaction occurs that causes the iron to slowly break down and form a reddish-brown coating of iron oxide. Rancidity refers to the spoilage of food due to the breakdown of fats and oils. One example of rancidity is when vegetable oil goes bad. When vegetable oil is exposed to air and light, the fats and oils in the oil start to break down and form unpleasant odors and flavors. The oil may become sticky or develop a rancid taste and smell.

Corrosion is defined as a process where materials, usually metals, deterioate as a result of a chemical reaction with air, moisture, chemicals, etc For example, iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide `4Fe +3O_(2)+nH_(2)O rarr 2Fe_(2)O_(3). nH_(2)O` Rancidity is the process of oxidation of fats oils that can be easily noticed by the change in taste and smell is known as rancidity For exampl, the taste and smell of butter changes when kept for long.

Page 6 Q1 Why should a magnesium ribbon be cleaned before burning in air? Answer. Magnesium is a very reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned with sandpaper to remove this layer so that the underlying metal can be exposed to air. Q2 Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen Q3 Write a balanced chemical equation with state symbols for the following reactions. (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water. Page 10 Q1 A solution of a substance ‘X’ is used for whitewashing. (i) Name the substance ‘X’ and write its formula. (ii) Write the reaction of the substance ‘X’ named in (i) above with water. Answer. (i) The substance ‘X’ is calcium oxide. Its chemical formula is CaO. (ii) Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime). Q2 Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount col...