Ans. Answer: The balanced chemical equation for the reaction is: CuO + H 2 → Cu + H 2 O. Write the balanced equation for the following chemical reactions. Copper burns in air to combines with oxygen and form copper (II) oxide, a black oxide. Work out the following using chemical equation. Silver is a very noble metal and is often found in a native state combined with gold, tin, copper, and platinum. silver plating, nickel plating. (a) Mg (s) + Cl 2 (g) → MgCl 2 (s) (d) TiCl 4 (l) + Mg (s) → Ti (s) + MgCl 2 (s) The hydrogen sulfide reacts with the silver to form silver sulfide. The chemical reaction is. When a copper object is exposed to moist air for a long time, then copper reacts with water, carbon dioxide and oxygen present in moist air to form a green coating on the copper object. Your email address will not be published. In this Zinc forms a protective layer of zinc carbonate on the surface of iron.This prevents corrosion. The following is the reaction with its abundance of soluble sulfates and oxygen-consuming, decaying organic matter, sulfate-reducing bacteria utilizes available sulfates under anaerobicconditions to form hydrogen sulfides as a metabolic product. Example: stainless steel. It displaces hydrogen from water/steam, which is evolved or released as a gas. when magnesium ribbon remains exposed to moist air, A white layer of magnesium oxide is formed On its surface. The hydrogen sulfide reacts with the silver to form silver sulfide. In the reaction above, copper oxide is losing oxygen. Hence, this layer is first removed by rubbing with Sand paper before burning. Class 10 Chemistry Chapter 1 Important Questions with Answers Chemical Reactions and Equations. Chemical reactions are the processes in which new substances with new properties are formed. When copper reacts with moist air it produce a beautiful green layer which is 1:1 mixture of copper hydroxide and copper carbonate. The chemical equation is: 2Cu + H2O + CO2 + O2 → Cu (OH) 2 + CuCO3. This is achieved by the following methods: When fats and oils are oxidised, they become rancid and their smell and taste is changed. By coating with paints: Paint coated metal surfaces keep out air and moisture. Fe(OH)3 (s) dehydrates into Fe2O3. The equation for this would be 4Fe + 6H20 gives 2Fe2O3 + 6H2 are added to foods containing fats and oil. (ii) Moist air and acidic gases are not good for some metals. The metal burns in air to form zinc(II) oxide, a material that goes from white to yellow on prolonged heating. presence of moisture makes corrosion faster but it is not necessary condition. Zinc reacts with oxygen in moist air. The symbolic representation of a chemical reaction is called a chemical equation; The method of representing a chemical reaction with the help of symbols and formula of the substances involved in it is known as a chemical equation. Fig. Copper developing green coloured rust on exposure to moist air The reaction is as follows: 2Cu + … It is formed by the chemcial reaction of copper in moist air. CBSE Class 10 Science Book Chapter 1 “Chemical Reactions and Equations” Multiple Choice Questions ‌(MCQs‌) with Answers. When a copper is exposed to moist air for long, it acquires a dull green coating. The chemical equation. nH2O (s) or rust. This layer hinders the burning of magnesium. The green coating is mainly Copper (II) Carbonate CuCO3 caused by slow chemical reactions involving the copper metal and water and carbon dioxide. (iv) Name the reducing agent. By the process of Galvanization: This is a process of coating zinc on iron sheets by using electric current. This is called Rancidity. In addition, silver is not affected by dry or moist air that is free from ozone, halogens, ammonia, and sulfur compounds . Fig. Question 1. 2Cu + H 2 O + CO 2 + O 2 → Cu(OH) 2 + CuCO 3 Your email address will not be published. Iron articles are shiny when new, but get coated with a reddish brown powder called rust (Fe. nH2O. The green material is a mixture of copper hydroxide and copper carbonate. The green coating is mainly Copper (II) Carbonate CuCO3 caused by slow chemical reactions involving the copper metal and water and carbon dioxide. (iii) Manufactured chips usually flush bags of chips with nitrogen gas. The chemical formula for rust is Fe2O3. The copper wire glows red. Methods of preventing Corrosion or Rusting : Corrosion of metals is prevented by not allowing them to come in contact with moisture and O2. State the substance that is being oxidised and the one that is getting reduced. Usually substances which prevent oxidation (antioxidants like Nitrogen, B.H.T.) In case of tarnishing of silver articles, the metallic silver reacts with hydrogen sulphide or sulphur present in air and gets tarnished. The black coating on silver and the green coating on copper are other examples of corrosion. Although presence of moisture makes corrosion faster but it is not necessary condition. Chemical reactions for zinc. The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). Write a balanced chemical equation for this reaction. When hydrogen is passed over hot copper oxide, we get copper and water. When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. Copper forms a green deposit on its surface when exposed to air which is usually a mixture of copper carbonate and copper hydroxide. 2 Cu + H2O + CO2 + O2 → Cu (OH)2 + CuCO3. Copper forms a green deposit on its surface when exposed to air which is usually a mixture of copper carbonate and copper hydroxide. why register with www.thechemistryguru.com. 2Cu + H 2 O + CO 2 + O 2 -------- Cu(OH) 2 + CuCO3 Copper + Water + Carbon dioxide + Oxygen -------- Copper hydroxide + Copper Carbonate 4 Sodium reacts with the oxygen in air to form sodium oxide, and traces of yellowish sodium peroxide. The overall reaction proceeds in the same process as described earlier for iron: The green coating on copper metal called a Patina. Q2. 2 Cu + H2O + CO2 + O2  → Cu (OH)2 + CuCO3. Corrosion of Iron is also called Rusting of iron. Chemical Reactions and Equations Extra Questions Long Answer Type. Deposit on its surface when exposed to air which is getting reduced place on Mendeleev s. Prevents them from moisture and air → Cu ( OH ) 2 + CuCO3 a Very metal! In case of tarnishing of silver articles, the metal burns in air for a long time, acquires! 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