342821
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
- soft enough to
be cut by a knife
- 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
- 2Li+2H₂O⇒2LiOH+H₂
- Lithium+Water⇒Lithium Hydroxide+Hydrogen
- 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
- Lithium: fizzed but
didn't melt,
reasonably vigorous
but nothing too
exciting
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