Reactions of the Group 2 elements Flashcards
when magnesium burns in air, what is observed
a very bright flame and the formation of a white solid
the other Group 2 elements (not magnesium) react how when they burn in oxygen
more vigorously, with a very bright flame and the formation of a white solid
to start the reaction between a Group 2 element and oxygen, we have to add
heat, though a slow reaction occurs anyway whereby a oxide layer is formed on the surface
the general equation for oxidation reaction of Group 2 elements is
2M(s) + O2(g) = 2MO(s)
Group 2 elements combine with chlorine in the……..state
gaseous state
the observations you make when magnesium burns in a flask containing chlorine as is
black smoke rises out of the flask while a white layer of smoke stays at the bottom
the trend for group 2 metals reacting with chlorine down the group is
a increase in vigour of the reactions
the general equation for group 2 element reactions with chlorine are
M(s) + Cl2(g) = MCl2(s)
the products of group 2 oxidation are (in terms of ions)
M2+ ions and O2- ions
the products of group 2 reactions with chlorine are (in terms of ions)
M2+ and Cl- ions
the trend for the reactivity of group 2 metals with water is
an increase in vigour down the group (increase is effervescence
effervescence means
the bubbles produced when a group 2 metal rectcs with water (hydrogen)
the general equation for group 2 metal reactions with water is
M(s) + 2H2O(l) = M(OH)2(aq) + H2(g)
the products of group 2 metal reactions with water are (in terms of ions)
Hydrogen gas, and hydroxides containing OH- ions and M2+ ions
calcium hydroxide is a solid after its reaction with water, and not aqueous because
calcium hydroxide is only slightly soluble in water, so it forms a cloudy mixture
