chapter 4 materials metals and non-metnotes in english pdf free download

 

 chapter 4 materials metals and non-metals notes in English pdf free download

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Class :-8

Subject:- विज्ञान (Science)

Chapter:- 4

Chapter name: Materials: Metals and non- metals

Question-1:Which of the following can be beaten into this sheets?

(a) Zinc    (b) Phosph0rus  (c) Sulphur   (d) Oxygen 

Answer-1: (a) Zinc

As Zinc is a metal and metal has property of malleability (can be converted in sheet by beating). Rest of these are non-metals.

Question-2: Which of the following statement is correct?

1. all metals are ductile 
2. All non-metals are ductile 
3. Generally, metals are ductile ✔️
4. some non-metals are ductile 

Question-3: Fill in the blanks-

1. Phosphorus is very _______ non-metal.
2. Metals are___________ conductors of  heat and ______
3. Iron is ______ reactive than copper.
4. Metals react with acids to products ________gas.

Answer-3:

1. reactive, 2. good, electricity, 3.more , 4.hydrogen

Question-4: Mark 'T' if statement is true and 'F' if it is false.

1. Generally non-metals react with acids (F)
2. Sodium is a very reactive metal (T)
3. Copper displaces zinc from zinc sulphate solution (F)
4. Coal can be drawn into wires. (F)

Question-5: Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties. 

S.No.	Properties	Metals	Non-metals
1	Appearance
2	Hardness
3	Malleability
4	Ductility
5	Heat Conduction
6	Conduction of electricity

Answer-5:

S.No.	Properties	Metals	Non-metals
1	Appearance	Lustrous	Dull
2	Hardness	Hard	Soft
3	Malleability	Malleable	Not malleable
4	Ductility	Ductile	Not Ductile
5	Heat Conduction	Good Conductor	Bad Conductor
6	Conduction of electricity	Good Conductor	Bad Conductor

Question-6: Give reasons for the following-

(a) Aluminum foils are used to wrap food items.

Answer-a: Aluminum foils are used to wrap food items because aluminum is highly malleable. It can be beaten into thin sheets. Moreover, it does not react with food.

(b)Immersion rods for heating liquids are made up of metallic substances.

Answer-b: Metals are good conductors of heat and electricity . Therefore, immersion rode's for heating liquids are made of metallic substances.

(c)Copper cannot displace zinc from its salt solution.

Answer-c:

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