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121083
The alkaline earth metals
Descrição
A level Chemistry (Reactions and elements) Mapa Mental sobre The alkaline earth metals, criado por mbaker25 em 03-06-2013.
Sem etiquetas
chemistry
reactions and elements
chemistry
reactions and elements
a level
Mapa Mental por
mbaker25
, atualizado more than 1 year ago
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Criado por
mbaker25
aproximadamente 11 anos atrás
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Resumo de Recurso
The alkaline earth metals
Loses two electron when they react
2+ ions
atomic radius increases down the group
Ionisation energy decreases down the group
Increased shielding
Valance electron is further away from the nucleus
Reactivity increases down the group
Low first and second ionisation energies
Melting points decrease down the group
Group 2 metallic structures, with the electrons of their outer shells being delocalised
Bigger ions=smaller charge/volume ratio
Electrons are more spread out
Except for magnesium
Crystal structure changes
Group 2 react with water
Be: doesn't react Mg: VERY slowly Ca: steadily Sr: fairly quickly Ba: rapidly
Solubility in hydroxide
Mg is least soluble
Barium is most soluble
Solubility in sulfate
Mg is most soluble
Barium is least soluble
Test for sulfate ions
Barium chloride is added to the solution
White precipitate of barium sulfate is formed
Group 2 compounds neutralise acidity
Calcium hydroxide neutralises acidic soils
Magnesium hydroxide is used in indigestion tablets
H+ +OH- --> H2O
Barium sulfate in barium meals
X-rays wont pass through barium sulfate
Insoluble
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