Alkali metals Flashcards
What group are alkali metals in?
1
What charge is on a ion of an alkali metal?
+1
Are alkali metal more reactive up or down the group?
Alkali metals become more reactive as you go down the group
What must alkali metals be stored under?
Oil
Whan an alkali metal reacts with water what two products are formed?
A metal hydroxide and hydrogen
e.g.
sodium and water ——> sodium hydroxide and hydrogen
Na + H2O ———–> NaOH + H2
What is the pH of the solution formed when an alkali metal reacts with water?
greater than 7 (alkali) - blue/purple
When an alkali reacts with oxygen what product is formed
A metal oxide
e.g.
lithium and oxygen ——> lithium oxide
Li + O2 —> Li2O
Describe the reaction of lithium (Li) with water
Floats, moves around the surface, hydrogen gas released
Describe the reaction of with potassium (K) with water
Floats, rapidly moves around the surface, hydrogen gas released catches fire
How do you test for hydrogen gas?
Squeaky pop test
What are the properties of alkali metals?
Soft (cut with a knife), dull (shiny when cut), low density
What is oxidation?
Addition of oxygen or loss of electrons
Remember:
OIL RIG
Oxidation is loss of electrons
Reduction is gain of electrons
