group 2 Flashcards
what is the trend in firsdt ionisation enrgy in group 2 metals
energy decreases down the group - the further away they are from the nucleus the more shielding they will have= less attraction from the nucleus
what is the trend in reactivity
increases down the group
what is the general trend in melting point for group 2 metals
decreases down the group - with a blip at mg
why is there a blip in the melting point of Mg
the crystal stucture changes - the arrangment of the metallic ions
what type of bonding do group 2 elements have
metallic
do group 2 elements get oxidised or reduced
oxidised - to go to their 2+ state
what is the trend in solubility for group 2 hydroxides
decreases in solubility up the group
HD
what is the trend in solubilty for group 2 sulphates
increases up the group
what do group 2 metals react with water to make
a metal hydroxide and hydrogen gas
does magnesium hydroxide have a low or high solubility
LOW
is barium sulphate soluble or insoluble
insoluble
what is the test for sulphate ions
dilute hydrochloric acid
add barium chloride
add to unknown solution
white precipitate will form if positive
what is a barium meal used for
X-ray imaging
the barium meal is so insoluble that it will pass through and coats soft tissue to show up on the x-ray
it is a suspension of barium sulphate
what is the equation for the extraction of titanium
TiCl4(g) + 2Mg(l) —–>Ti(s) +2MgCl2(l)
what si the role of Mg in the extraction of Ti
it causes the TiCl4 to be reduced - it is the reducing agent.
