9. Periodic Table

Question 1

Physical properties of g1

Answer 1

Good conductor of heat and electricity
Soft
Low density
Low mp and bp

Question 2

Chemical properties of g1

Answer 2

very reactive
Burst into flames when heated with oxygen
Li - red, na- yellow, k - lilac
React with water to form g1 metal hydroxide and hydrogen
React with oxygen forming metal oxide
React with halogen to form a metal halide
Oxides can dissolve in water forming an alkaline solution of the metal hydroxide

Question 3

Alkali metal

Answer 3

Soft, mp and bp decrease down the group, get softer down the group, increase density down the group
Reactivity increased down the group
Have to be stored under oil to stop them from reacting with oxygen from the air
When cut, show a silvery surface that oxidise quickly

Question 4

Properties of g7

Answer 4

Formed color gases
Poisonous
Diatomic - 2 atoms in each molecules
Cl - green gas, br - reddish brown liquid, I -  greyish black solid
Brittle and crumbly in solid form
Don't conduct electricity

Question 5

G7 reaction with g1 metal

Answer 5

Halide salts formed when metals react with halogen

Reactivity of the halogen with Na decrease down the group

Question 6

Reaction of halogens with halide ions

Answer 6

More reactive halogen displaces a less reactive halogen from a solution of its halide
Displacement reaction

Question 7

Pattern of halogen

Answer 7

Size, mass, density and color darkness increase down the group
Reactivity decrease down the group bc it has to gain electron so the closer the electron is to the positive nucleus the more easily it will be gained

Question 8

Transition metal

Answer 8

High densities
High mp and forming coloured compound
Catalyst
Stronger and harder than g1 metal
Leas reactive than metals from other groups
Dont react with cold water, some react with steam

Question 9

Noble gases

Answer 9

Unreactive colorless gas
Monatonic
Density increases down the group
Bp increase down the group

Question 10

Uses of noble gases

Answer 10

He: weather balloon and airship bc it is lighter than air, inert (rather than H bc it is highly flammable)
Neon: advertising signs because it glows red when a high voltage is passed through
Argon: inert atmosphere in the extraction of titanium to stop the metal from oxidising
Argon: electric light bulb - prevent the filament burning