A portion of the sample is digested in a combination of acids. (ii) Moist air and acidic gases are not good for some metals. (a) Mg (s) + Cl 2 (g) → MgCl 2 (s) (d) TiCl 4 (l) + Mg (s) → Ti (s) + MgCl 2 (s) Class 10 Chemistry Chapter 1 Important Questions with Answers Chemical Reactions and Equations. By coating with oil and grease: Application of oil and grease on the surface of iron tools prevents them from moisture and air. Ans. State the substance that is being oxidised and the one that is getting reduced. CBSE Class 10 Science Book Chapter 1 “Chemical Reactions and Equations” Multiple Choice Questions (MCQs) with Answers. Chemical Reactions and Equations Class 10 Important Questions Very Short Answer Type. Chemical Reactions and Equations Extra Questions Long Answer Type. In the reaction above, copper oxide is losing oxygen. This process is commonly known as rusting of iron. [math]4Na+O_2\to 2Na_2 O[/math] [math]2Na_2 O+O_2\to 2Na_2 O_2[/math] The sodium oxide formed will react with water to give sodium hydroxide. The chemical reaction is. The reaction is as follows: 2Cu + … The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). Iron reacts with water in the form of steam to form iron oxide, along with the release of hydrogen. Work out the following using chemical equation. The chemical equation. In case of rusting of copper, the metallic copper reacts with oxygen, carbon-dioxide and atmospheric moisture and develops a green coloured coating of copper hydroxide and copper carbonate. In moist air, copper corrodes to produce a green layer on the surface? When a copper is exposed to moist air for long, it acquires a dull green coating. In corrosion, the metal is slowly oxidized by the air. Copper burns in air to combines with oxygen and form copper (II) oxide, a black oxide. Question 1. nH2O. Here is a compilation of Free MCQs of Class 10 Science Book Chapter 1 – Chemical Reactions and Equations.. Students can practice free MCQs as have been added by CBSE in the new Exam pattern. Fe(OH)3 (s) dehydrates into Fe2O3. Usually substances which prevent oxidation (antioxidants like Nitrogen, B.H.T.) The metal burns in air to form zinc(II) oxide, a material that goes from white to yellow on prolonged heating. Chemical reactions are the processes in which new substances with new properties are formed. Your email address will not be published. This gives a green colour to the surface of copper metal. Consider the chemical equation given below and answer the questions that follow: (i) Name the substance which is getting oxidised. The green coating (or green material) is a mixture of copper hydroxide [Cu (OH) 2 ] and copper carbonate (CuCO 3 ) which is formed by the action of moist air on copper object. By alloying with other metals: Alloys (mixture of metals) is more resistant to corrosion. Chemical reactions for silver. Corrosion of Iron is also called Rusting of iron, . It is completely stable in aqueous solutions. The black coating on silver and the green coating on copper are other examples of corrosion. When copper reacts with moist air it produce a beautiful green layer which is 1:1 mixture of copper hydroxide and copper carbonate. This is achieved by the following methods: When fats and oils are oxidised, they become rancid and their smell and taste is changed. are added to foods containing fats and oil. Write the balanced equation for the following chemical reactions. 2 Cu + H2O + CO2 + O2 → Cu (OH)2 + CuCO3. Required fields are marked *, What Happens When Copper Vessel Is Exposed To Moist Air For Long Time State. 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. By coating with paints: Paint coated metal surfaces keep out air and moisture. When hydrogen is passed over hot copper oxide, we get copper and water. This is called Rancidity. The green coating on copper metal called a Patina. 2Cu + H 2 O + CO 2 + O 2 → Cu(OH) 2 + CuCO 3 Corrosion of Iron is also called Rusting of iron. Zinc reacts with oxygen in moist air. Although presence of moisture makes corrosion faster but it is not necessary condition. In a marine environment, 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. Write chemical equations for the reactions taking place when: (i) Iron reacts with steam (ii) Magnesium reacts with dilute HCl (iii) Copper is heated in air Answer: Question 9. fialance the following chemical equations and identify the type of chemical reaction. The hydrogen sulfide reacts with the silver to form silver sulfide. Since the chemical equation consists of symbols, we can think of this as a symbolic representation. It displaces hydrogen from water/steam, which is evolved or released as a gas. We can go further and translate the picture equation for the reaction between magnesium and oxygen to a chemical equation: 2 Mg + O 2 → 2 MgO. 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. presence of moisture makes corrosion faster but it is not necessary condition. This layer hinders the burning of magnesium. The equation for this would be 4Fe + 6H20 gives 2Fe2O3 + 6H2 This hinders the burning of magnesium. The chemical equation is: 2Cu + H2O + CO2 + O2 → Cu (OH) 2 + CuCO3. The chemistry of the reaction resulting in the formation of rust can be summarized as follows: The chemical equations for rust formation, 2Fe(s) + 2H2O(l) + O2(g) → 2Fe2+(aq) + 4OH–(aq), 4Fe(OH)2 (s) + O2(g) + 2H2O(l) → 4 Fe(OH)3 (s). Electroplating: It is a method of coating one metal over the surface of Iron (or other metal) by passing electric current. In addition, silver is not affected by dry or moist air that is free from ozone, halogens, ammonia, and sulfur compounds . Sodium reacts with the oxygen in air to form sodium oxide, and traces of yellowish sodium peroxide. Methods of preventing Corrosion or Rusting : Corrosion of metals is prevented by not allowing them to come in contact with moisture and O2. Chemical reactions for zinc. Copper developing green coloured rust on exposure to moist air (ii) Name the substance which is getting reduced. The overall reaction proceeds in the same process as described earlier for iron: The green coating on copper metal called a Patina. Copper oxidation is a natural process. The hydrogen sulfide reacts with the silver to form silver sulfide. (iii) Name the oxidising agent. The chemical formula for rust is Fe2O3. Copper carbonate is the chemical compound that forms the blue-green patina seen on copper. Keeping food in air tight containers helps to slow down oxidation or Rancidity. The green coating is mainly Copper (II) Carbonate CuCO3 caused by slow chemical reactions involving the copper metal and water and carbon dioxide. COPPER CORROSION. Iron articles are shiny when new, but get coated with a reddish brown powder called rust (Fe. Method 3500-Ag C Inductively Coupled Plasma Method [2]. nH2O (s) or rust. (iii) Manufactured chips usually flush bags of chips with nitrogen gas. The copper wire glows red. Copper, like all other metals, is capable of oxidation, forming stable bonds in the forms of oxides and salts. 10th Chemical reaction and equation questions with solution 01 Q.1. Your email address will not be published. Q2. Question 1. Copper forms a green deposit on its surface when exposed to air which is usually a mixture of copper carbonate and copper hydroxide. Write a balanced chemical equation for this reaction. Answer: The balanced chemical equation for the reaction is: CuO + H 2 → Cu + H 2 O. By the process of Galvanization: This is a process of coating zinc on iron sheets by using electric current. (iv) Name the reducing agent. Copper developing green coloured rust on exposure to moist air. when magnesium ribbon remains exposed to moist air, A white layer of magnesium oxide is formed On its surface. 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. 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