Metals and Non-metals Note Class 6

Page no. 294

Metals and Non-metals

Very Short questions

1. What is metal?
   A metal is a substance that is generally hard, shiny, and a good conductor of heat and electricity.
2. What is a non-metal?
   A non-metal is a substance that is generally dull and a poor conductor of heat and electricity.
3. Which property of non-metals makes them poor conductors of electricity?
   Insulating property of non-metals makes them poor conductors of electricity.
4. Write one physical property of non-metals.
   One physical property of non-metals is that they are poor conductor of heat and electricity.
5. What are metalloids?
   Metalloids are elements that have properties of both metals and non-metals.
6. Why is silicon called metalloid?
   Silicon is called a metalloid because it has properties of both metals and non-metals.
7. Name any two non-metals.
   Two non-metals are sulphur and oxygen.
8. Name any two metals.
   Two metals are iron and gold.
9. Write one property of metalloids?
   One property of metalloids is that they have metallic luster.

Short questions

1. Write down two properties of metals.
   The two properties of metals are:
   i) They are good conductor of heat and electricity.
   ii) They are malleable and ductile in nature.
2. Write down two properties of non-metals.
   The two properties of non-metals are:
   i) They are bad conductor of heat and electricity.
   ii) They are non-malleable and non-ductile in nature.
3. Differentiate between metals and non-metals.

   Metals	Non-metals
   They are good conductor of heat and electricity.	They are bad conductor of heat and electricity.
   They are malleable and ductile in nature.	They are non-malleable and non-ductile in nature.
   They have high density.	They have low density.

4. Write down the three characteristics of metals.
   The three characteristics of metals are:
   i) They are good conductor of heat and electricity.
   ii) They are malleable and ductile in nature.
   iii) They have high density.
5. Write two properties of metalloids.
   The two properties of metalloids are:
   i) They have metallic luster.
   ii) They are non-ductile in nature.
6. Write down name of the three metals that are used in making coins.
   The three metals that are used in making coins are gold, copper and silver.
7. Which of the following is a non-metal? Why?
   i) Iron     ii) Chlorine     iii) Silicon
   Chlorine is a non-metal because of the following reasons:
   • It is a poor conductor of heat and electricity.
   • It does not have metallic luster.

Long questions

3. Classify the metals, non-metals and metalloids from the given examples.
   Copper, iron, silicon, sulphur, iodine, arsenic, silver, phosphorus, gold, oxygen, germanium, aluminium

   Metals	Non-metals	Metalloids
   Copper, iron, silver, gold, aluminium	Sulphur, iodine, phosphorus, oxygen	Silicon, arsenic, germanium

6. Study the given figures and answer the following questions.
   
   i) ii)      iii)
   
   

   a) Identify one metal and one non-metal from the above figure.
   Metal: Fig(i) - Gold
   Non-metal: Fig(ii) - Sulphur

   b) Does the substance shown in figure (ii) conduct heat.
   The substance shown in fig (ii) [Sulphur] does not conduct heat.

   c) Write one difference between the substance shown in fig (i) and fig (ii).

   Fig (i) – Gold	Fig (ii) – Sulphur
   It is a good conductor of heat and electricity.	It is a poor conductor of heat and electricity.

   d) Write any two uses of the substance shown in fig (iii).
   The two uses of the substance shown in fig (iii) [Silicon] are:
   i) Silicon is used to make computer chips and electronic devices.
   ii) Silicon is used to make solar cells/panels.