CH4

Question 1

6 Elements of Group 18

Answer 1

Helium Neon Argon Krypton Xenon Radon

Question 2

2 Other Names for Group 18

Answer 2

Noble Gas
Inert Gas

Question 3

Why are -Elements of group 18- monoatomic gas?

Answer 3

Atoms have achieved stable duplet or octet electron arrangement
Atoms do not share, receive or donates electron with other atoms

Question 4

Change in size of atomic radius / atomic size going down group 18

Answer 4

Number of electrons increase
Number of shell occupied with electron increases
Atomic size of atom increase

Question 5

Change in melting/boiling point going down group 18

Answer 5

Size of atom increase
Forces of attraction between atoms become stronger
More heat energy is required to overcome forces of attraction
Melting/boiling point Increase

Question 6

2 Uses of Helium

Answer 6

Used to fill weather baloons
Used in oxygen tanks of diver

Question 7

Use of Neon

Answer 7

Used in advertising board light

Question 8

2 Uses of Argon

Answer 8

used to fill in electric bulbs
used to provide an inert atmosphere for high temperature welding

Question 9

2 Uses of Krypton

Answer 9

Used in Camera Flashlight
Used in Lasers for eye retina treatment

Question 10

2 Uses of Xenon

Answer 10

Used in lighthouse lamps
Used for anesthesia

Question 11

Use of Radon

Answer 11

Used to treat cancer

Question 12

6 Elements of Group 1

Answer 12

Lithium Sodium Potassium Rubidium Caesium Francium

Question 13

Another name for Group 1

Answer 13

Alkali Metals

Question 14

Change in size of atom going down group 1

Answer 14

Number of electrons Increase
Number of shells filled with electron increases
Size of atom increase

Question 15

Change in Melting/Boiling point going down group 1

Answer 15

Size of atom increases
Forces of attraction between atoms becomes weaker
Less heat energy is required to overcome forces of attraction
Melting/boiling Point decreases

Question 16

Comparison of Boiling/Melting Point of Group 1 Compared to other metal

Answer 16

Lower melting/boiling point compared to other metals

Question 17

4 Characteristics of Alkali Metals

Answer 17

Grey shiny surface at room temperature
Soft metals
Low Density
Float on water

Question 18

Change in reactivity going down group 1

Answer 18

Size of atom increases
Distance between nucleus of atom and valence electron becomes further
Forces of attraction between nucleus and valence electron become weaker
Valence electron is easier to donate
Reactivity increase

Question 19

Arrangement of Periodic Table Of Elements

Answer 19

ascending order of proton number

Question 20

3 Properties of Caesium and Rubidium

Answer 20

Burns easily
Usually combined with other elements
difficult to be isolated chemically

Question 21

Property of Francium

Answer 21

Unstable radioactive isotope with short half-life

Question 22

Product of reaction between Alkali metals and Chlorine gas

Answer 22

White solid of Metal Chloride

Question 23

Products of reaction between Alkali metals and Water

Answer 23

Alkaline Hydroxide solution and Hydrogen Gas

Question 24

Product of reaction between Alkali metals and Oxygen gas

Answer 24

Metal oxide

Question 25

Product of reaction between (Alkali) metal oxide and water

Answer 25

Alkaline Hydroxide solution

Question 26

Use of Lithium

Answer 26

Used in battery production

Question 27

Uses of Sodium

Answer 27

Used in Sodium Vapour Lamps

Question 28

Use of Potassium

Answer 28

Used in fertilisers

Question 29

6 Elements of Group 17

Answer 29

Fluorine Chlorine Bromine Iodine Astatine Tenessine

Question 30

Other name for group 17

Answer 30

Halogen

Question 31

Uses of Chlorine

Answer 31

Used as bleach

Question 32

Uses of bromine

Answer 32

Used as a substance in fire extinguisher

Question 33

Uses of Iodine

Answer 33

used as disinfectant

Question 34

Change of melting/boiling point going down group 17

Answer 34

Size of molecules increases Forces of attraction between molecules increases More heat energy is required to overcome forces of attraction between molecules Boiling point/ Melting point Increases

Question 35

Chlorine at room temperature

Answer 35

Greenish-yellow gas

Question 36

Bromine at room temperature

Answer 36

Reddish brown liquid

Question 37

Iodine at room temperature

Answer 37

Purplish Black Solid

Question 38

Products of reaction between halogens and Water

Answer 38

Acidic Solution

Question 39

Products of reaction between halogens and metal

Answer 39

Metal Halide

Question 40

Products of reaction between halogens and alkaline solution

Answer 40

Metal halide, Metal halate and Water

Question 41

Change in reactivity going down group 17

Answer 41

Size of atom increases Distance between nucleus and valence electron becomes further Forces of attraction between nucleus and electrons becomes weaker More difficult to receive electron Lower Reactivity

Question 42

2 General Properties of Halogen

Answer 42

Soluble in organic solvent Does not conduct heat nor electricity

Question 43

3 Properties of Fluorine Gas

Answer 43

light yellow poisonous gas very reactive and corrosive Cause a strong explosion when combined with Hydrogen Gas

Question 44

2 Properties of Astatine

Answer 44

rare radioactive element not chemically stable

Question 45

8 Elements of period 3

Answer 45

Sodium Magnesium Aluminium Silicon Phosphorus Sulphur Chlorine Argon

Question 46

Use of Magnesium

Answer 46

as a substance in lighter

Question 47

Use of aluminum

Answer 47

as a substance in can

Question 48

Use of Phosphorus

Answer 48

as a substance in firework

Question 49

Use of silicon

Answer 49

as fungicides

Question 50

Change in atomic size across period 3

Answer 50

Number of proton in the nucleus of the atom increase Charge of atom's nucleus increase Forces of attraction between nucleus and valence electrons becomes stronger Distance between Valence electron and nucleus becomes shorter Size of atom becomes smaller

Question 51

Change in Electronegativity across period 3

Answer 51

Number of proton in the nucleus of the atom increase Charge of atom's nucleus increase Forces of attraction between nucleus and electrons becomes stronger Ability of atom to receive electron increase atom easier to receive electrons electronegativity increase

Question 52

Metals Of Period 3

Answer 52

Sodium Magnesium Aluminium

Question 53

Metalloid / Semi-metals of period 3

Answer 53

Silicon

Question 54

Non metals of period 3

Answer 54

Phosphorus Sulphur Chlorine Argon

Question 55

Basic oxide of period 3

Answer 55

Sodium Oxide Magnesium Oxide

Question 56

Amphoteric Oxide of Period 3

Answer 56

Aluminium Oxide

Question 57

Acidic Oxide of Period 3

Answer 57

Silicon Oxide Phosporus Oxide Chlorine OXide

Question 58

Properties of Amphoteric oxide

Answer 58

React with both acid and alkaline to produce water and salt only

Question 59

Properties of Semi-metal

Answer 59

Have both properties of metal and non-metal Weak conductor of electricity

Question 60

Uses of semi-metal

Answer 60

Used as semiconductor in electronic microchip manufacture

Question 61

6 Physical properties of transition Metals

Answer 61

Solid with shiny surface malleable ductile high melting and boiling point high density Very hard compared to metal of group 1 & 2`

Question 62

4 Special Characteristics of Transition elements

Answer 62

form coloured ions or compound act as a catalyst that increase rate of reaction without change in chemical properties at the end of the reaction form complex ions have more than one oxidation number

Question 63

4 Transition Elements used in industries

Answer 63

* Iron-Haber Process-Ammonia * Platinum-Ostwald Process-Nitric Acid * Vanadium (v) Oxide-Contact process-Sulphuric Acid * Nickel or Platinum-Hydrogenation process on veggie oils-Margarine

Question 64

Uses of 1. Manganese 2. Iron 3. Titanium

Answer 64

1. Stained glass windows 2. bridges 3. Titanium