Reactions of the Group 2 Elements Flashcards
what is needed in order to trigger the reaction between a group 2 element and oxygen
heat (energy)
despite heat being needed, what reaction would the metal still be going through in air anyway
a slow reaction between the element and oxygen in the air
what does this slow reaction form and what does it do
- a coating of oxide
- which helps prevents the element from further reacting
what is the trend in the reactivity of group 2 elements with oxygen down the group
the reactivity increases
given that barium would be the most reactive element, how does it need to be stored and why
- it is stored under oil
- this is to keep it from reacting with oxygen and water vapor in the air
what is the general equation for the reaction between these metals and oxygen, using M
2M(s) + O2(g) = 2MO(s)
what is done with group 2 elements and chlorine in order for them to react
the metal is heated in chlorine gas
what is the trend in the reactivity of the metals with chlorine down the group
the reactions become more vigorous
what is the general equation for the reaction between group 2 elements and chlorine, using M
M(s) + Cl2(g) = MCl2(s)
what observable event occurs when group 2 metals are placed into water and react with it
- effervescence
- bubbles of hydrogen gas would be produced
what is their trend in reactivity with water down the group
their reactivity increases
what is the general equation for the reaction between group 2 elements and water using M
M(s) + 2H2O(l) = M(OH)2(aq) + H2(g)
what state would calcium hydroxide be in and why
- a solid state (precipitate)
- because its insoluble in water
what is different about how magnesium reacts with steam
- the equation is Mg(s) + H2O(l) = MgO(s) + H2(g)
- it doesnt form a hydroxide but an oxide instead
if this reaction is done in a lab, what is done to the produced hydrogen and why
- it is burned as it leaves the ‘container’
- to prevent the escape of a highly flammable gas
