Module 3: Reactivity trends Flashcards
1
Q
Group 2 metals are known as …
A
Alkaline earth metals.
2
Q
Write an oxidation reaction with a group 2 metal.
A
Ca = Ca2+ + 2e-
Ca is oxidised. The group 2 element is called the reducing agent as it has reduced another species.
3
Q
All group 2 metals react with oxygen. Write an equation to show this.
A
2Mg (s) + O2 (g) = 2MgO (s)
4
Q
Group 2 metals react with water to form …
A
Metal hydroxide and hydrogen gas.
5
Q
Describe some uses of group 2 compounds.
A
Ca(OH)2 is used in agriculture to neutralise the acid in soils, forming neutral water.
Mg(OH)2 and CaCO3 is used to treat acid indigestion by neutralising HCL in stomach.
6
Q
Mg(OH)2 is …
A
Slightly soluble in water so fewer free
OH- ions are produced so lower pH.
7
Q
At RTP, all halogens exist as …
A
Diatomic molecules.
8
Q
A
