Why should magnesium ribbon be cleaned

Note: Magnesium is the eighth most abundant element in the earth’s crust, and about 2% of it makes up the earth. Magnesium is chemically very active. When heated, it changes into many different compounds. Magnesium is used to make many different metals. Answer: When left open in the air, Magnesium reacts with atmospheric oxygen to form Magnesium Oxide (MgO). The MgO layer does not burn or slow down the burning process, and thus should be removed. So the Magnesium ribbon should be cleaned off with a sandpaper before burning, to remove impurities that may cause a reaction. Once cleaned, only pure Magnesium is present and can react without interference from other substances. Magnesium Magnesium is an alkaline Earth metal. Alkaline Earth metals are very reactive because they have just two electrons in their outer electron shell. Besides the fact that it has a high reactivity with oxygen and water, the element has the ability to start fires and cause explosions. This is why magnesium is used for military explosives and missile propellant. Air composed of nitrogen and oxygen. They are both important components of air. Remember that magnesium only reacts with oxygen in the air to form an oxide coating on its surface but it doesn’t react with the atmospheric nitrogen at all. This is because gaseous nitrogen is really inert and it doesn’t react with magnesium. Magnesium Ribbon The magnesium ribbon is a thin strip of magnesium alloy that produces intense heat and bright white light ...

Magnesium is an extremely 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 by sand paper for removing this layer so that the underlying metal can be exposed to air.

Magnesium ribbon should be cleaned before burning in air because Magnesium metal reacts with oxygen present in the atmosphere and forms a very stable compound i.e, Magnesium Oxide(MgO). In order to prevent further reactions with Oxygen, it is therefore required to clean the ribbon to remove the layer of MgO. NCERT solutions of related questions for Chemical Reactions and Equations • Write a balanced equation for the following chemical reactions. (i) Hydrogen+Chloride \(\rightarrow \) Hydrogen Chloride (ii) Barium Chloride+Aluminium Sulphate \(\rightarrow \) Barium Sulphate+Aluminium Chloride (iii) Sodium+Water \(\rightarrow \) Sodium hydroxide+Hydrogen • 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 solution of Sodium chloride. (ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce Sodium chloride solution and water. • 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. • Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas. • Why does the colour of copper sulphate solution change when an iron nail is dipped in it? • Give an example of a double displacement reaction other than t...

Q 1. Why should magnesium ribbon be cleaned before burning in air? SOLUTION: Ans : Magnesium ribbon is cleaned before burning so that coating of impurity (such as oxide) formed on its surface is removed and it becomes pure magnesium. Q 2. Write the balanced equations for the following chemical reactions. (a) Hydrogen + chlorine → hydrogen chloride (b) Barium chloride + aluminium sulphate → barium sulphate + aluminium chloride (c) Sodium + water → sodium hydroxide + hydrogen SOLUTION: Ans : Q 3. Write a balanced chemical equation with state symbols for the following reactions : (a) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (b) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water SOLUTION: Ans : Q 4. A solution of the substance X is used for white washing. (i) Name the substance X and write its formula. (ii) Write the reaction of the substance X with water. SOLUTION: Ans : (i) The substance X is calcium oxide (also called quick lime). Its formula is CaO. (ii) Q 5. Why is double the amount of gas collected in one of the test tubes in electrolysis of water than the amount collected in the other? Name the gas. SOLUTION: Ans : On electrolysis, water decomposes according to the reaction, Thus, water decomposes to give hydrogen and oxygen in the ratio 2 : 1 by volume. The double volume of the gas collected is h...

Since Magnesium is an reactive metal in the reactivity series, when it is exposed to oxygen it will form metal oxides. For example, when oxygen is mixed with one of these metals for an extended period of time, you will see rust form and a brownish color coat over it as a tint. With Magnesium, what will happen if exposed to oxygen for too long is create a white coating on the outside of it which will impede and effect the burning process. Thus, when sanded with sand paper, we are able to remove this extra layer that is impeding the burning, so that it can burn as if it weren't exposed to years of oxygen.

Magnesium ribbon should be cleaned before burning in air because Magnesium metal reacts with oxygen present in the atmosphere and forms a very stable compound i.e, Magnesium Oxide(MgO). In order to prevent further reactions with Oxygen, it is therefore required to clean the ribbon to remove the layer of MgO. NCERT solutions of related questions for Chemical Reactions and Equations • Write a balanced equation for the following chemical reactions. (i) Hydrogen+Chloride \(\rightarrow \) Hydrogen Chloride (ii) Barium Chloride+Aluminium Sulphate \(\rightarrow \) Barium Sulphate+Aluminium Chloride (iii) Sodium+Water \(\rightarrow \) Sodium hydroxide+Hydrogen • 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 solution of Sodium chloride. (ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce Sodium chloride solution and water. • 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. • Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas. • Why does the colour of copper sulphate solution change when an iron nail is dipped in it? • Give an example of a double displacement reaction other than t...

Note: Magnesium is the eighth most abundant element in the earth’s crust, and about 2% of it makes up the earth. Magnesium is chemically very active. When heated, it changes into many different compounds. Magnesium is used to make many different metals. Answer: When left open in the air, Magnesium reacts with atmospheric oxygen to form Magnesium Oxide (MgO). The MgO layer does not burn or slow down the burning process, and thus should be removed. So the Magnesium ribbon should be cleaned off with a sandpaper before burning, to remove impurities that may cause a reaction. Once cleaned, only pure Magnesium is present and can react without interference from other substances. Magnesium Magnesium is an alkaline Earth metal. Alkaline Earth metals are very reactive because they have just two electrons in their outer electron shell. Besides the fact that it has a high reactivity with oxygen and water, the element has the ability to start fires and cause explosions. This is why magnesium is used for military explosives and missile propellant. Air composed of nitrogen and oxygen. They are both important components of air. Remember that magnesium only reacts with oxygen in the air to form an oxide coating on its surface but it doesn’t react with the atmospheric nitrogen at all. This is because gaseous nitrogen is really inert and it doesn’t react with magnesium. Magnesium Ribbon The magnesium ribbon is a thin strip of magnesium alloy that produces intense heat and bright white light ...

Since Magnesium is an reactive metal in the reactivity series, when it is exposed to oxygen it will form metal oxides. For example, when oxygen is mixed with one of these metals for an extended period of time, you will see rust form and a brownish color coat over it as a tint. With Magnesium, what will happen if exposed to oxygen for too long is create a white coating on the outside of it which will impede and effect the burning process. Thus, when sanded with sand paper, we are able to remove this extra layer that is impeding the burning, so that it can burn as if it weren't exposed to years of oxygen.

Magnesium is an extremely 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 by sand paper for removing this layer so that the underlying metal can be exposed to air.

Q 1. Why should magnesium ribbon be cleaned before burning in air? SOLUTION: Ans : Magnesium ribbon is cleaned before burning so that coating of impurity (such as oxide) formed on its surface is removed and it becomes pure magnesium. Q 2. Write the balanced equations for the following chemical reactions. (a) Hydrogen + chlorine → hydrogen chloride (b) Barium chloride + aluminium sulphate → barium sulphate + aluminium chloride (c) Sodium + water → sodium hydroxide + hydrogen SOLUTION: Ans : Q 3. Write a balanced chemical equation with state symbols for the following reactions : (a) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (b) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water SOLUTION: Ans : Q 4. A solution of the substance X is used for white washing. (i) Name the substance X and write its formula. (ii) Write the reaction of the substance X with water. SOLUTION: Ans : (i) The substance X is calcium oxide (also called quick lime). Its formula is CaO. (ii) Q 5. Why is double the amount of gas collected in one of the test tubes in electrolysis of water than the amount collected in the other? Name the gas. SOLUTION: Ans : On electrolysis, water decomposes according to the reaction, Thus, water decomposes to give hydrogen and oxygen in the ratio 2 : 1 by volume. The double volume of the gas collected is h...