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Apparatus: Pairs of tongs or spatula, kn...

Apparatus: Pairs of tongs or spatula, knife, burner, etc.
Chemicals: Samples of aluminium, copper, iron, lead, magnesium, zinc and sodium.
Procedure: Hold the sample of each of the above metals at the top of the flame of a burner with the help of a pair of tongs, or a spatula

How does the surface of a metal appear on catching fire?

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The surface of a metal appears greyish black due to the formation of metal oxide.
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Apparatus: Pairs of tongs or spatula, knife, burner, etc. Chemicals: Samples of aluminium, copper, iron, lead, magnesium, zinc and sodium. Procedure: Hold the sample of each of the above metals at the top of the flame of a burner with the help of a pair of tongs, or a spatula Which metal catches fire readily?

Apparatus: Pairs of tongs or spatula, knife, burner, etc. Chemicals: Samples of aluminium, copper, iron, lead, magnesium, zinc and sodium. Procedure: Hold the sample of each of the above metals at the top of the flame of a burner with the help of a pair of tongs, or a spatula What is the colour of the flame while the metal is burning on the flame?

Apparatus: Metal spatula, burner, carbon electrodes, beaker, cell, lamp, press key, electrical wires, etc. Chemicals: Samples of sodium chloride, potassium iodide and barium chloride, water. Procedure: Observe the above samples. Place sample of one of the above salts on the spatula and heat it on the flame of the burner. Repeat the procedure using the other salts. As shown in the figure, assemble an electrolytic cell. Assemble an electrolytic cell by using a beaker and connecting the carbon electrodes to the positive and negative terminal of the cell. Dip the electrodes in solution of any one of the salts. Do you see the lamp glowing? Check this with all the other salts as well.

Apparatus: Bunsen burner, copper gauze, metal plate, etc. Chemicals : Ethanol, acetic acid, naphthalene Procedure: Place one of the above chemicals (3-4 drops or a pinch) on clean copper gauze at room temperature, hold it on a blue flame of the Bunsen burner and observe. Is smoke/soot seen to form due to combustion? Hold the metal plate on the flame when the substance is undergoing combustion. Does any diposit get collected on the plate? Which colour? Repeat the same procedure using other chemicals from the above list.

Apparatus: Big test tube, delivery tube fitted in a rubber cork, knife, candle, etc. Chemicals : Sodium metal, ethanol, magnesium ribbon, etc. Procedure : Take 10 mL ethanol in a big test tube. Cut Sodium metal into 2-3 pieces of a cereal grain size. Put the sodium pieces into the ethanol in the test tube and fix the gas delivery tube to the test tube. Take a burning candle near the outlet of the gas delivery tube and observe. Does magnesium metal react with ethanol?

Apparatus: Big test tube, delivery tube fitted in a rubber cork, knife, candle, etc. Chemicals : Sodium metal, ethanol, magnesium ribbon, etc. Procedure : Take 10 mL ethanol in a big test tube. Cut Sodium metal into 2-3 pieces of a cereal grain size. Put the sodium pieces into the ethanol in the test tube and fix the gas delivery tube to the test tube. Take a burning candle near the outlet of the gas delivery tube and observe. Repeat the above procedure using magnesium ribbon instead of sodium. Do you see gas bubble released from the piece of magnesium ribbon?

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