Physics, asked by sarithateacher9, 6 months ago




1.write the physical properties of metals ?
2.what is the chemical reaction
of magnesium and sulphur with oxygen (combustion reaction)?
3.Experimentally prove the reactivity
of metals of zinc, iron and
copper?
4.write
the uses of metals and uases
of Non-metals?
5.which gas makes
lighted match
stick is
brought?​

Answers

Answered by Anonymous
0

Answer:

1. Physical Properties of Metals

Some physical properties of metals are listed below.

  • Shiny (lustrous) in nature
  • Metal is a good conductor of electricity and heat
  • Density and melting point is in high
  • Mouldable (Malleable)
  • Ductile
  • At room temperature, it is in solid form except for mercury
  • Opaque

2. A chemical reaction is the change of a substance into a new one that has a different chemical identity.

3.Result and Conclusion:

Zinc displaces copper, and iron from their solutions. Zinc is more reactive than Cu and Fe metal. Iron displaces copper from its solution. Therefore, copper is less reactive than iron.

4.Uses of some common metals and non-metals are as follows.

Metals Iron is used for making automobiles, machinery, pipes, containers, nails, etc. Gold and silver are used for making jewellery. Copper is used for making electrical wires, cooking utensils, etc. Zinc is mainly used as a protective coating for iron. Aluminium is used for making electrical cables, packaging, cooking utensils, etc.

Non-metals Hydrogen is used for the synthesis of ammonia and methyl alcohol, in welding torches, etc. Sulphur is used in the manufacture of compounds like sulphuric acid and sulphates and in the production of matches, dyes, and gunpowder. Graphite is used in pencils, in zinc-carbon batteries, and in brake linings. Phosphorus is used in the fireworks industry and for making special glasses used in sodium lamps.

5.When the matchstick catches fire or is burnt, the heat released due to the burning of chemicals on the match head, partly decomposes the wood to form wood gas. The wood gas then catches fire and produces a flame.

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