Group 2

1. Reactions

1.1. Reaction with Oxygen

1.1.1. forming white solid oxides

1.1.1.1. O2−(s)  +  H2O(l) --> 2OH−(aq)

1.2. Reaction with Water

1.2.1. Cold

1.2.1.1. Slowly

1.2.1.2. form a weakly alkaline solution

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

1.2.2. Hot

1.2.2.1. Vigorously

1.2.2.2. Produce metal oxide and hydrogen gas

1.2.2.2.1. Mg(s)  +  H2O(g) --> MgO(s)  +  H2(g)

1.3. Reaction of Group 2 carbonates with water and with dilute acids

1.3.1. forming a salt and water and giving off carbon dioxide gas

1.3.1.1. MgCO3(s)  +  H2SO4(aq) MgSO4(aq)  +  H2O(l)  +  CO2(g)

1.3.2. insoluble

2. Thermal Decomposition

2.1. Always use heat

2.1.1. Strongly

2.2. Carbonate

2.2.1. Metal carbonate --> Metal Oxide + CO2

2.2.1.1. MgCO3(s) --> MgO(s)  +  CO2(g)

2.3. Nitrate

2.3.1. Group 2 Nitrates -->Metal Oxide + NO2 + O2

2.3.1.1. 2Ca(NO3)2(s) --> 2CaO(s)  +  4NO2(g)  +  O2(g)

3. Element

3.1. Be

3.2. Mg

3.3. Ca

3.4. Sr

3.5. Ba

3.6. Ra(radioactive)

4. Properties

4.1. Radius

4.1.1. Increasing

4.2. Melting Point

4.2.1. Decreasing

4.3. Reactivity

4.3.1. Increasing

5. Some Uses

5.1. Make a building material

5.1.1. Cement

5.2. Neutralise acid

5.3. Fireworks