8B.3 Reactions of group 2 elements

Question 1

what onservenstions are made when group 2 metals react with oxygen

Answer 1

1. a very bright flame

2. a formation of a white solid

Question 2

for the group 2 metal to react with oxygen do they require heat

Answer 2

heat is required but they can still react very slowly with the oxygen which would form a surface coating of oxide which would stop the element from further reacting

Question 3

what is the general formula for group 2 metals when they react with Oxygen

Answer 3

2M(s) + O2(g) —->2MO(s)

Question 4

what is the general formula for group 2 metals reacting with chlorine

Answer 4

M(s) + Cl2(g) —–> MCl2(s)

Question 5

how does the reaction of group 2 metal show their trends

Answer 5

1 reaction would oxygen more vigor down the group (brighter flame)

2. reaction would Cl more vigor
3. reaction with motor more vigor (more fizzing)

Question 6

what is the general equation of group 2 metals with water

Answer 6

M + 2H2O —-> M(OH)2 + H2

Question 7

what is the difference when calcium reacts with water

Answer 7

since it is more soluble the experiment goes cloudy as calcium hydroxide is formed as

Question 8

what is the reaction between magnesium and steam

Answer 8

as mg is heated by steam it would react very vigorously producing a lot of hydrogen gas and MgO which is a white solid

Question 9

what is the equation between Mg and H2O

Answer 9

Mg(s) + H2O(g) —-> MgO(s)+ H2(g)

Question 10

what is a safety precaution taken when reacting Mg with hydrogen

Answer 10

all of the gas (H2) of burned off to avoid having flammable gas into the labbotory

Question 11

what is the trend in group 2 metals

Answer 11

increase down the group