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Metals and Non Metals

Metals and Non Metals
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Metals

  • Metals are defined as those materials which have the characteristics of being shiny, hard, ductile, fusible, malleable, etc.
  • Examples are iron, silver, gold, copper, aluminum, etc.

 

Science Class 8 Metals and Non-metals

Physical properties of metals

Malleability

  • This property of metals allows it to get beaten into thin sheets.
  • It is used in the silver foils which are used to decorate sweets and aluminium foils which are used to wrap food.

Science Class 8 Metals and Non-metals

Conductivity

  • Current and heat pass through the metals easily by conductivity.
  • Examples are nail, copper, iron rod, etc.

Science Class 8 Metals and Non-metals

Ductility

  • This property makes the metals drawn into the wires.

Science Class 8 Metals and Non-metals  

Sonorous

  • When metals are hit they produce ringing sounds due to this property.

Science Class 8 Metals and Non-metals  

Lustrous

  • When metals shine and are sufficient to reflect incident light, it becomes possible due to the lustrous property of metals.

Science Class 8 Metals and Non-metals  

Non - Metals

  • When metals do not possess such characteristics of metals then they are termed as Non-Metals.
  • Nonmetals are poor conductors of electricity and heat and are non-sonorous.
  • Examples are carbon, oxygen, sulphur, etc.

Science Class 8 Metals and Non-metals

Chemical Properties for metals and nonmetals

  1. Reaction with oxygen
  • For Metals

When oxygen and metals react, metallic oxides are formed.

  • For non-metals

Oxides are produced when non-metals react with oxygen

 2. Reaction with water

  • For metals

Line in case of sodium, some metals with water react vigorously. But some metals react slowly like in the case of iron.

  • For non-metals

Most of the non-metals do not react with water but still, there are some non-metals which react a little in the air like phosphorus. It is usually kept in water to prevent an explosion.

Application of metals

  • These are generally used in making automobiles, machines, cars, aeroplanes, satellites, etc.
  • Some metals are also used to make wires like copper, etc.
  • Ornaments like silver, gold, etc. are also made from metals.

Application of non-metals

  • A very important non-metal is oxygen which is necessary for the survival of all the living beings.
  • Nonmetals are also used as fertilizers to induce the growth of plants.
  • Nonmetals are used as antiseptic.
  • Crackers are made up of nonmetals.

 

Recap

  • Metals are defined as those materials which have the characteristics of being shiny, hard, ductile, fusible, malleable, etc.
  • Examples are iron, silver, gold, copper, aluminium, etc.
  • When metals do not possess such characteristics of metals then they are termed as Non-Metals.
  • Nonmetals are poor conductors of electricity and heat and are non-sonorous.
  • Examples are carbon, oxygen, sulphur, etc.

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Quiz for Metals and Non Metals

Q.1

Which of them can replace copper from it's salt solution?

a) Silver
b) Gold
c) Iron
d) Mercury

Q.2

Copper sulphate + Zinc ---------------------> ____________________ + copper

a) Zinc
b) Zinc Sulphate
c) Zinc hydroxide
d) Zinc-copper alloy

Q.3

Which of them can replace sodium from it's salt solution?

a)

Copper

b)

Aluminium

c)

Iron

d)

none of the above

Q.4

In displacement reaction, ___________________ reactive metal displaces ____________________ reactive metal from the salt solution.

a) More, Less
b) Less, More
c) Equally, Equally
d) No, No

Q.5

I) Copper is a metal II) Sulphur is a non-metal

a) Both I and II are false
b) Both I and II are true
c) I is true and II is false
d) I is false and II is true

Q.6

I) Metals react with water to give hydrogen II) Copper reacts with acid to give chlorine

a) Both I and II are false
b) Both I and II are true
c) I is true and II is false
d) I is false and II is true

Q.7

____________ Litmus changes colour to __________________ when put in acidic solution.

a) Red, Yellow
b) Green, Pink
c) Red, Blue
d) Blue, Red

Q.8

If we put a red litmus paper in acidic solution ,it _____________________

a) Doesn’t change colour
b) Burns itself
c) Becomes blue
d) Becomes pink

Q.9

Copper + Zinc sulphate ---------------> ________________ + ________________

a) Copper sulphate + Zinc
b) Copper-Zinc alloy + Water
c) Copper sulphate + Zinc sulphate
d) No reaction occurs

Q.10

Which of them is a poor conductor of electricity?

a) Copper
b) Lead
c) Silver
d) Aluminium

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