Group Chemistry

Question 1

what are the physical properties of group 1 metals?

Answer 1

• m.p and b.p decrease down the group due decrease in metallic bonding
• densities(low) but increase down the group
• become softer down the group
• good conductors of heat and electricity

Question 2

what are some chemical properties of group 1 metals?

Answer 2

• very reactive - have to be stored in oil to prevent reaction between air+h20
• reacts with non-metals to form an ionic compound
• more reactive down the group

Question 3

what is formed when group 1 metal undergoes combustion or tarnishing due to o2 reaction ?

Answer 3

simple oxides
eg:
2Li +O2 -> Li2O

Question 4

Why does the reactivity increases for group 1?

Answer 4

atomic radius increases
therefore the distance between the outer electron and the nucleus increases
the attraction therefore decreases
even if there Is an increase in nuclear charge

Question 5

Physical properties of Halogens - group 7?

Answer 5

-low m.p and b.p but increase down the group
- poor conductors of heat and electricity

Question 6

why do the m.p and b.p increase down the group for halogens?

Answer 6

the strength of intermolecular forces between molecules increases

as halogen molecules get larger down the group
more electrons
therefore IMF increases and more energy needed to break IMF forces

Question 7

What are the chemical properties of group 17?

Answer 7

reactivity of halogens decreases down the group
- more reactive halogen will displace less reactive halogen from solutions
eg: chlorine more reactive than bromine or iodine therefore will displace by oxidising or removing an electron

Question 7

What are the chemical properties of group 17?

Answer 7

reactivity of halogens decreases down the group
- more reactive halogen will displace less reactive halogen from solutions
eg: chlorine more reactive than bromine or iodine therefore will displace by oxidising or removing an electron

Question 8

Physical properties of the noble gases?

Answer 8

• very low m.p and b.p but increases down the group
• colourless gases at room temp
• densities increase down the group

Question 9

Why does the bp and mp increase down the group of group 18?

Answer 9

size of noble gases and e- present increase down the group
stronger IMF forces
more energy required

Question 10

Why do the densities increase for noble gases?

Answer 10

mass of atoms increase down the group

Question 11

What are chemical properties of group 8?

Answer 11

• complete outer shell - unreactive(inert)
• exist as single atoms