group 2

Question 1

atomic radius

Answer 1

increases down group
more shells of electrons bigger atom

Question 2

melting points down the group

Answer 2

decreases down the group
metallic bonding weaken as atomic size increases
more distance between positive ions and delocalised electrons
so electrostatic forces of attraction weaken

Question 3

ionisation energy first

Answer 3

energy needed to remove electrons from each atom in one mole of gaseous atoms

Question 4

second ionisation energy

Answer 4

enthalpy chance when one mole of gaseous ions with a single positive charge from one mole of gaseous ions with double positive charge

Question 5

trend of first and second ionisation energy dow the group

Answer 5

decrease down the group as the outermost electrons are held more weakly as they are successively further from the nucleus
more shielded from nucleus attraction by repulsive force of inner shell electrons

Question 6

reactivity of group 2 down the group

Answer 6

increased reactivity down group
as atomic radius increases and nuclear attraction decreases so easier to remove outer electrons

Question 7

group two and oxygen

Answer 7

burn in oxygen
mg burns with bright white flame

Question 8

group 2 and steam

Answer 8

eg mgo and h2

Question 9

group 2 and cold water

Answer 9

metal oh2 and h2

Question 10

would would you observe with hydroxides down the group

Answer 10

more fizzing
metal dissolves faster
solution heats up more
less ppt

Question 11

reaction of g2 and acid

Answer 11

salt and hydrogen

Question 12

magnesium oxide uses

Answer 12

partially soluble in water
ph9
used in medicine neutralise excess acid in stomach to treat constipation
safe as so weakly alkaline
Mg(OH)2 + 2HClMgCl2 + 2H2O

Question 13

calcium hydroxide uses

Answer 13

soluble in water kind of
naturalise acid soil
too much soil too alkaline to sustain crop growth
aq called limewater test 4 co2 turns cloud as white calcium carbonate produced
Ca(OH)2 (aq) + CO2 (g)  CaCO3 (s) + H2O(l)