Group 1 Alkali Metals Flashcards
Melting point ____ from Li-Fr
Decreases
The softness of the metals ____ as we go down the group
Increases
Reactivity ____ going down the group
Increases
Why does the reactivity increase going down the group 1 metals?
Metals ALWAYS lose an electron when reacting
The more energy levels there are the farther away the outer electron is from the nucleus. Therefore the electrostat. of attraction is weaker. The easier it is to lose an electron (the bigger the atom) the more reactive the element will be. Reactivity (and mass) increases down the group in the group 1 metals.
Metal + Water = ?
Metal hydroxide + Hydrogen
When reacting with water, all the metals have what reactions? (Li)
effervescing, floating on the water, forming a colourless solution, metal disappears, and temp of water increasing.
Properties of sodium when reacted with water:
Same as Li
melts and forms a sphere, if prevented from moving, ignites with a yellow/orange flame
Properties of potassium when reacted with water:
Same as Li
ignites with a lilac flame
LiCL
State and colour:
Observation in water:
Observation in flame:
White (s)
dissolves
turns flame red
Na2CO3
State and colour:
Observation in water:
Observation in flame:
White (s)
dissolves
burns flame orange-yellow
KCL
State and colour:
Observation in water:
Observation in flame:
White (s)
Dissolves
Lilac flame
Why are group 1 metals stored in oil?
They are highly reactive and are stored to prevent them reacting with the oxygen and water vapour in the air
density ___ going down the group
increases
metal hydroxides are an (alkaline/ base) solution, and have a (high/low) pH
They are an alkaline solution with a high pH
Upon adding UI (universal indicator), the water turns ___ if the alkali is produced
purple
