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Byju's Answer
Standard VIII
Chemistry
Preparation of Hydrogen from Steam
Fill in the b...
Question

Fill in the blanks with the right words given within the brackets:

Metals are _________ while non-metals are ________ of heat.


A

Conductors

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B

Non-Conductors

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Solution

  • The heat conductivity of metals and non-metals is proportional to their electrical conductivity.
  • Metals are good conductors of heat and electricity as they have free or mobile electrons.
  • Non-metals are bad conductors or non-conductors of heat and electricity as they lack free or mobile electrons.

Metals are conductors while non-metals are non-conductors of heat.


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Q.

Fill in the blanks:

(a) Phosphorus is a very _________ non-metal.

(b) Metals are ________ conductors of heat and _________.

(c) Iron is ________ reactive than copper.

(d) Metals react with acids to produce _________ gas.

Q. Complete the incomplete statements with missing words:
(a) Metals are _________ while non-metals are ___________ poor conductors of heat.
(b) Metals are malleable while non-metals are ___________.
(c) Metals form positive ions while non-metals ___________.
(d) Non-metals form acidic oxides while metals form __________.
Q. Fill in the blanks with the correct words.
1. ................... (Mung beans/Wheat) is an example of cereals.
2. ................... (Lustre/Smoothness) refers to the shine of a material.
3. ................... (Metals/Non-metals) are good conductors of heat.
4. Baking a cake is an example of a ................... (physical/chemical) change.
5. Snake has a special structures called ................... (scales/cerci) which helps in crawling.
Q. Fill in the blanks with the proper word from the brackets.
(radiation, white, conduction, blue, convection, bad conductor, good conductor, black, reflection)

(a) Maximum heat is absorbed by a ................ coloured object.

(b) ...................... of heat does not require a medium.

(c) Conduction of heat takes place through a .......................... substance.

(d) The shining surface in a thermos flask decreases the outgoing heat by ......................... .

(e) Cooking utensils are made from metals due to their property of ................. .

(f) The earth receives heat from the sun by .................... .
Q.

Fill in the following balnks with suitable words:

(a) Metals are ........................... conductors of heat and ............................

(b) Most non-metals are ........................... conductors of heat and ...........................

(c) Phosphorous is a very ........................... non-metal.

(d) Metals react with acids to produce ........................... gas.

(e) Iron is more ........................... than copper.

(f) Metals form ........................... oxides whereas non-metals form ........................... oxides.

(g) Sulphur forms ........................... oxide whereas magnesium forms ........................... oxide.

(h) A non-metal is used to make an antiseptic solution called tincture ...........................

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