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
1. soft enough to be cut by a knife
2. have to be stored in oil to stop them reacting with the water in air
3. shiny when freshly cut, tarnish on exposure to air due to a layer of oxide forming
4. melting and boiling points decrease down the group
5. float on water - density goes up down the group
6. conduct heat and electricity
Experiment: reacting Gp 1 elements with water
1. Lithium: fizzed but didn't melt, reasonably vigorous but nothing too exciting
  1. Lithium+Water⇒Lithium Hydroxide+Hydrogen
    1. 2Li+2H₂O⇒2LiOH+H₂
2. Sodium: fizzed more than lithium, melted, more violent reaction than lithium, carried around by lots of Hydrogen, left a white trail
3. Potassium: produced a lila/purple flame (Hydrogen burns)
4. The pH of the solutions changed from neutral to alkali - the solution is a strong alkali

Zusammenfassung der Ressource

	Erstellt von jess99 vor etwa 11 Jahre