Trends in Group 2 properties and reactionsAQA A-Level Chemistry: Mind map

Exam questions on Trends in Group 2 properties and reactions

1. The first ionisation energies of four Group 2 elements (in kJ mol⁻¹) are: Mg 738, Ca 590, Sr 550, Ba 503.
   Explain why the atomic radius of barium is greater than the atomic radius of calcium.2 marks
2. The melting points of four Group 2 metals are: Mg 923 K, Ca 1115 K, Sr 1050 K, Ba 1000 K.
   Explain why barium has a lower melting point than calcium.2 marks
3. A teacher compares the reactions of Group 2 metals with water. Calcium reacts steadily with cold water. Magnesium shows only a few bubbles with cold water but burns brightly in steam.
   Write an equation, including state symbols, for the reaction of calcium with cold water. State and explain whether the resulting solution is acidic or alkaline.3 marks