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342821
Group 1 Elements
Descrição
GCSE Chemistry Mapa Mental sobre Group 1 Elements, criado por jess99 em 09-11-2013.
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chemistry
gcse
chemistry
gcse
Mapa Mental por
jess99
, atualizado more than 1 year ago
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Criado por
jess99
quase 11 anos atrás
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Resumo de Recurso
Group 1 Elements
common name = alkali metals (they form alkali solutions when they react with water)
Reactivity increases as you go down the group
Physical Properties
soft enough to be cut by a knife
have to be stored in oil to stop them reacting with the water in air
shiny when freshly cut, tarnish on exposure to air due to a layer of oxide forming
melting and boiling points decrease down the group
float on water - density goes up down the group
conduct heat and electricity
Experiment: reacting Gp 1 elements with water
Lithium: fizzed but didn't melt, reasonably vigorous but nothing too exciting
Lithium+Water⇒Lithium Hydroxide+Hydrogen
2Li+2H₂O⇒2LiOH+H₂
Sodium: fizzed more than lithium, melted, more violent reaction than lithium, carried around by lots of Hydrogen, left a white trail
Potassium: produced a lila/purple flame (Hydrogen burns)
The pH of the solutions changed from neutral to alkali - the solution is a strong alkali
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