Paper 2 SPECIMEN (SET 1) - Q2
2) Magnesium and calcium are in group 2 of the periodic table. They are less reactive than the metals in group 1.
(a) Calcium reacts with water to form calcium hydroxide, Ca(OH)2, and hydrogen, H2.
(a) Calcium reacts with water to form calcium hydroxide, Ca(OH)2, and hydrogen, H2.
Describe what would be seen when a piece of calcium is dropped into a container of water.
(2)
(b) Magnesium reacts very slowly with cold water but it reacts faster with steam, H2O, and forms magnesium oxide, MgO, and hydrogen.
Write the balanced equation for the reaction between magnesium and steam. (2)
(c) The electronic configurations of magnesium and calcium are
magnesium 2.8.2
calcium 2.8.8.2
When magnesium and calcium react with water they form positive ions.
Suggest an explanation, in terms of their electronic configurations, why calcium is more reactive than magnesium. (2)
(d) A sample of calcium bromide contains 0.2g calcium and 0.8g bromine by mass.
Calculate the empirical formula of calcium bromide.
(relative atomic masses: Ca = 40, Br = 80) (3)
(b) Magnesium reacts very slowly with cold water but it reacts faster with steam, H2O, and forms magnesium oxide, MgO, and hydrogen.
Write the balanced equation for the reaction between magnesium and steam. (2)
(c) The electronic configurations of magnesium and calcium are
magnesium 2.8.2
calcium 2.8.8.2
When magnesium and calcium react with water they form positive ions.
Suggest an explanation, in terms of their electronic configurations, why calcium is more reactive than magnesium. (2)
(d) A sample of calcium bromide contains 0.2g calcium and 0.8g bromine by mass.
Calculate the empirical formula of calcium bromide.
(relative atomic masses: Ca = 40, Br = 80) (3)
empirical formula = ..............................................................
(Total for Question 2 = 9 marks)