Module 3 - Group 2 Flashcards
What is a common name
given to group 2 metals?
Alkaline earth metals
What is the most reactive
metal of group 2?
Barium
List 3 physical properties of
group 2 metals
● High melting and boiling points
● Low density metals
● Form colourless (white) compounds
The highest energy electrons
of group 2 metals are in which
subshell?
S subshell
Does reactivity increase or
decrease down group 2?
Why?
● Increases
● Electrons are lost more easily because larger
atomic radius and more shielding.
● Less of a intermolecular attraction between the nucleus and electrons
What happens to the first
ionisation energy as you go
down group 2? Why?
Decreases because:
-Number of filled electron shells increases down the group →
increased shielding
-Increased atomic radius → weaker force between outer - -
-Electron and nucleus → less energy needed to remove
electron
What type of reaction is the
reaction between group 2
elements and oxygen?
Redox reaction
Write an equation for the
reaction of calcium and
oxygen
2Ca (s) + O2 (g) → 2CaO (s)
What are the products when
group 2 elements react with
water?
Hydroxide and hydrogen gas
Which group 2 element
doesn’t react with water?
Beryllium
Which group 2 element reacts
very slowly with water?
Magnesium
What type of reaction is the
reaction between group 2
metal and water?
Redox reaction
Write an equation for the
reaction of barium and
water
Ba (s) + 2H2O (l) → Ba(OH)₂ (aq) + H₂ (g)
What is oxidised and what is
reduced in a reaction between
group 2 metal and water?
Metal → oxidised
One hydrogen atom from each water →
reduced
What are the products when a
group 2 element reacts with an
dilute acid?
Salt and hydrogen gas
Write an equation for the
reaction of calcium and
hydrochloric acid
Ca (s) + 2HCl (aq) → CaCl2(s) + H₂ (g)
What is formed when group 2
oxides react with water?
Metal hydroxide
Write an equation for the
reaction between a group 2
oxide and water
MO (s) + H2O (l) → M(OH)2(aq)
What group 2 metal oxide is
insoluble in water?
Beryllium oxide
What is the trend in hydroxide
solubility down group 2?
Increases down the group
Mg(OH)₂ is slightly soluble
Ba(OH)₂ creates a strong alkaline solution
What is Ca(OH)2
used for?
Write an equation related to
one of its uses
Used to neutralise soil
Ca(OH)₂ (aq) +2HCl (aq) → 2H₂O (l) + CaCl₂ (aq)
What is Mg(OH)2
used for?
Milk of magnesia - antacid to treat indigestion,
heartburn, etc
What is calcium carbonate
used for?
Present in limestone and marble
Used in building construction
What is the drawback of using
calcium carbonate in
construction? Write a related
equation
Group 2 carbonates react with acid
CaCO3 (s) + 2HCl (aq) → CaCl2 (aq) + H2O (l) + CO2 (g)
