3.1.2 group 2 Flashcards
How do group 2 elements act as reducing agents?
Group 2 elements reduce another species in a redox reaction.
Leads to 2+ ions.
What is the trend of reactivity down group 2?
Reactivity increases down group 2.
What do group 2 elements react with to form metal oxides?
Group 2 elements react with oxygen to form a metal oxide.
In which something is reduced and oxidised.
What do group 2 elements react with to form an alkaline hydroxide?
Group 2 elements react with water to form an alkaline hydroxide and hydrogen gas.
What do group 2 elements form when reacted with dilute acids?
Group 2 elements react with dilute acid to form salt and hydrogen gas.
Why do ionisation energies decrease down group 2?
The ionisation energies decrease down the group because he attraction between the nucleus and the outer electrons decreases as a result of increasing atomic radius and increasing shielding.
What is the solubility of group 2 elements hydroxides?
The solubility of hydroxides in water increases down the group, so the resulting solutions contain more OH- (aq) ions and are more alkaline.
What is the reaction between group 2 oxides and water?
The oxides of group 2 elements react with water, releasing hydroxide ions and forming alkaline solutions of the metal hydroxide.
Only slightly soluble in water.
How can group 2 compounds be used in agriculture?
Calcium hydroxide (Ca(OH)2) is added to fields as lime by farmers to increase the pH of acidic soils.
How can group 2 compounds be used in medicine?
Often used as antacids for treating acid indigestion.
Neutralisation reaction between Mg(OH)2 and CaCO3.
