Module 3 Section 1 - Group 2 Elements

Question 1

What type of ions do group 2 elements form?

Answer 1

2+

Question 2

What is the trend in reactivity down group 2?

Answer 2

Reactivity increases down group 2

Question 3

Why does reactivity increase down group 2?

Answer 3

as you go down the group, atomic radius and shielding effect increases. This makes it easier for the atom to lose an electron.

Question 4

What does a reaction between group 2 and water produce?

Answer 4

Metal hydroxide and hydrogen

Question 5

Reaction between calcium and water

Answer 5

Ca(s) + 2H2O(l) ->. Ca(OH)2 (aq) + H2(g)

Question 6

What does the reaction between group 2 and oxygen produce?

Answer 6

Solid white oxides

Question 7

Reaction between calcium and oxygen

Answer 7

2Ca(s) + O2(g) -> 2CaO (s)

Question 8

What does a reaction between group 2 and dilute acid produce ?

Answer 8

Salt and hydrogen

Question 9

Reaction between calcium and dilute hydrochloric acid?

Answer 9

Ca(s) + 2HCl(aq) -> CaCl2(aq) + H2(g)

Question 10

What are group 2 oxides and hydroxides?

Answer 10

Bases. Most are soluble in water so are also alkalis. The oxides form more strongly alkaline solutions as you go down the group, because the hydroxides get more soluble.

Question 11

What is the main function of group 2 compounds

Answer 11

They neutralise acidity

Question 12

Common examples of compounds used for neutralising acids

Answer 12

1) calcium hydroxide (slaked lime, Ca(OH)2) is used in agriculture to neutralise acidic soils

2) Magnesium hydroxide (Mg(OH)2) and calcium carbonate (CaCO3) are used in some indigestion tablets as antacids.

Question 13

Reaction between Magnesium hydroxide and hydrochloric acid

Answer 13

Mg(OH)2(s) + 2HCl(aq) -> MgCl2(aq) + 2H20(l)