Have you ever noticed the difference in the sound when an iron piece and wooden piece are dropped? Do you want to know why they sound different? Because iron and wood are entirely two different materials with different properties which are given in NCERT Solutions for Class 8 Science Chapter 4 Material Metals and Non metals. We have seen knife made of the iron piece but not with wood. Like this, only some materials are hard, lustrous, malleable, ductile, sonorous and good conductors of heat and electricity.
In NCERT Solutions for Class 8 Science Chapter 4 Material Metals and Non metals you will study the chemical and physical properties of all these metals and non-metals. You can make sound by hitting an iron piece but in the case of charcoal, you can not. Why? Because iron is metal and charcoal is non-metal. Note to be added here is mercury is a liquid metal. Throughout Class 8 Science Chapter 4 Material Metals and Non-metals, we are going to understand certain physical, chemical properties and reactions of metals and non-metals
4.1 Physical Properties of Metals and Non-metals
4.2 Chemical Properties of Metals and Non-metals
4.3 Uses of Metals and Non-metals
There are a variety of applications of metals, for example for conduction of current metallic wires are used, many cooking utensils are made of metals. For assignment try to list out such applications and which property of material helps for the applications. There are certain activities mentioned in NCERT chapter 4 of class 8 for the teacher to demonstrate it, do not try to do it yourself.
The main points of NCERT Solutions for Class 8 Science Chapter 4 Material Metals and Non metals are listed below
Metals are lustrous whereas non-metals are not.
Generally, metals are malleable and ductile. Non-metals are not malleable and not ductile.
Metals are good conductors of heat and electricity whereas non-metals are poor conductors.
Metals react with oxygen to produce metal oxides which are basic in nature. Non-metals react with oxygen to produce non- metallic oxides which are acidic in nature. Certain examples are given in NCERT Solutions for Class 8 Science Chapter 4 Material Metals and Non metals.
Some metals react with water to produce metal hydroxides and hydrogen gas. Generally, nonmetals do not react with water.
Metals react with acids and produce hydrogen gas and metal salts. Generally, non-metals do not react with acids.
Some metals react with bases to produce hydrogen gas
More reactive metals displace less reactive metals from their compounds in aqueous solutions.
After completing those activities ask your teacher to observe the result and come to a conclusion. The activities and exercises in Grade 8 Science Chapter 4 Materials Metals and non-metals are interesting.
So try to do all NCERT Solutions for Class 8 Science Chapter 4 Material Metals and Non-metals and observe the result. This will help you to make your studies better. Memorizing things will be easy trough doing the activities than repeatedly reading it.
And if you face any problem or if you want to understand any question in a better way then, we are providing the NCERT Solutions for Class 8 Science Chapter 4 Material Metals and Non metals below, as this will help you to score more marks in your exam.
Here is an activity from NCERT Class 8 Science Chapter 4 Material Metals and Non metals
1. Write the properties of metal responsible for following
a) when an iron piece is hit with a hammer a bell sound is heard
b) the sheet used to cover food are made of aluminum foil
c) Electric wires are made of Aluminium
d) knife is used for cutting
Q9. What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
Write word equations of the reactions involved.
Q6. Give reasons for the following.
(c) Copper cannot displace zinc from its salt solution.
Q11. One day Reeta went to a jeweller’s shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?