Group 2 Flashcards
Nam for group 2
alkaline earth
what state are group 2 metals typically found in
compounds bc they are reactive so do not occur naturally in their elemental state
That type of ‘agent’ are group 2 metals and why
reducing agent. bc they themselves are oxidized (lose 2 electrons) causing another species to be reduced
G2 metal + O2
Metal oxide (generally MO)
G2 + H2O
Alkaline hydroxide and hydrogen gas, general formula M(OH)2
G2 + dilute acid
Salt and hydrogen
Reactivity/ reducing agent trend in G2
Increases down group, so become stronger REDUCING agents
How many ionization energies does the formation of a G2 ion involve
2 bc a 2+ ion forms
trend in sum of 1st and 2nd ionization energies down G2 and interpret
decreases, less energy require to remove 2 electrons
Explain increase in reactivity down G2: 3 marks
Increase in atomic radius
Increase in inner shell shielding
So nuclear attraction decreases
describe the solubility of G2 hydroxide in water
slightly soluble
what forms when an aqueous solution of G2 hydroxide becomes saturated
white precipitate of metal hydroxide
How can you determine trend in solublilty
Test pH: The more OH- ions in solution, the more soluble the compound is
what is the relationship between solubility, pH and alkalinity of G2 metal hydroxides and group trend
As solubility increase, more OH ions in solution so pH increases meaning alkalinity has increased (down the group)
Use of G2 as bases in agriculture
Ca(OH)2 is added to fields as like to neutralise acidic soil
