Metals And Non-metals

Question 1

What are metalloid?

Answer 1

Substances that show the characteristics of both metals and non-metals.
Si, Ge, As, Sb, Te

Question 2

Are metals electronegative or electropositive elements?

Answer 2

Electropositive, as they lose electrons and form +ve ions

Question 3

Are non-metals electronegative or electropositive elements?

Answer 3

Electronegative, as they gain electrons and form -ve ions

Question 4

When metals combine with oxygen, what is the nature of their oxides?

Answer 4

Basic Oxides

Question 5

What is the nature of the oxides when non-metals combine with oxygen?

Answer 5

Acidic or neutral oxides

Question 6

What metals react with water? What type?

Answer 6

Na, K, Mg, Al, And, Fe
Na and K react violently with cold water
Mg reacts with hot water
Al, Zn and Fe with steam

Question 7

What metals do not react with water?

Answer 7

Pb, Au, Ag, Cu

Question 8

Do non-metals react with water?

Answer 8

No, non-metals do not react with water to produce H2 gas

Question 9

H2 gas is liberated when metals react with what acid(s)?

Answer 9

HCl, H2SO4

Question 10

Reaction with what acid(s) makes a metal not evolve H2, but H2O?

Answer 10

HNO3

Question 11

Exception of metals, which produce H2, when reacting with HNO3?

Answer 11

Mg, Mn

Question 12

Non-metals reaction with acids

Answer 12

Non-metals do not displace H2 from acids, because, non-metals are electron acceptor and they cannot supply electrons to Hydrogen.

Question 13

Metals react with Cl2 to form what?

Answer 13

Ionic metal Chloride
Metals are electron donor
Chlorine is electron acceptor

Question 14

Non-metals react with chlorine to form?

Answer 14

Covalent chloride

Question 15

The liquid non-metal

Answer 15

Bromine

Question 16

A lustrous non-metal

Answer 16

Iodine

Question 17

Hardest natural known substance which is a non-metal

Answer 17

Diamond

Question 18

Non-metal which is a good conductor of electricity

Answer 18

Graphite

Question 19

Liquid metal

Answer 19

Mercury

Question 20

Metals with low melting point

Answer 20

Gallium and caesium

Question 21

Soft metals that can be cut easily

Answer 21

Li, Na, K

Question 22

Metals with low densities

Answer 22

Li, Na, K

Question 23

What are ionic compounds

Answer 23

Ionic compounds are 5hose compounds that are formed by the transfer of electrons from a metal to a non-metal

Question 24

Properties of ionic compounds

Answer 24

Physical nature - hard and solid, due to the strong force of attraction between oppositely charged ions.
Melting point and boiling point - they both are high, as more energy is needed to break the force of attraction between the oppositely charged ions.
Solubility - soluble in water but insoluble in organic solvent.
Conduction of electricity - They conduct electricity in solution or molten state as ions moved towards opposite electrodes.

Question 25

Ahat are minerals

Answer 25

The natural materials in which the metals occur in the form of its compounds

Question 26

What are ores?

Answer 26

Minerals from which metals can be extracted profitably and conveniently

Question 27

What are ores?

Answer 27

Minerals from which metals can be extracted profitably and conveniently

Question 28

What is metallurgy?

Answer 28

The extraction of metals from their ores and then refining them for use

Question 29

What are noble metals

Answer 29

Metals that do not corrode easily

Question 30

What is aquaregia?

Answer 30

A freshly prepared mixture of conc. HCl and conc. HNO3 in the ratio 3:1.
Aqua regia can dissolve all metals, even gold and platinum, which can not be dissolved by conc. HNO3 or conc. HCl alone.
Demerit of aquaregia- highly corrosive and fuming liquid.