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2A Group 1 (alkali metals) (lithium (metal floats on water's surface,…
2A Group 1 (alkali metals)
lithium
metal floats on water's surface
Bubbles of gas, effervescence
Add universal indicator and solution formed goes purple colour
Sodium
Metal floats on water's surface
Bubbles of gas/ effervescence
Add universal indicator and solution formed goes purple coloured.
Potassium
Bubbles of gas/ effervescence (fastest production of gas)
Add universal indicator and solution formed goes purple colour
Metal floats on water's surface
What happens in group one
Chemical reactivity increase as you go down group 1
Reaction that occurs is the same it just gets stronger as you go down.
They all have hydroxide in there name because alkalis usually do. ( Lithium hydroxide, sodium hydroxide and Potassium hydroxide.
UI= blue/ purple. Red litmus= blue. Phenolphthalein = hot/bright pink.
Lithium + water = lithium hydroxide + hydrogen gas - swap this by changing the metal. (sodium + water = sodium hydroxide + hydrogen Gas
Flame test - element with the air and water
Na+ goes to orange/ yellow
K+ goes to lilac
li+ goes to red
Going down a group properties of elements vary. if you know properties further down the group you can predict properties of other unknown elements in the group.
When the outer electron reacts with the metals it is lost from the atom.
The difference between the structure of each atom going down the group, more shells, atoms get bigger so the outermost electrons is further away from the nucleus.
The positive nucleus attracts the negative electrons. The outer most electron is more easily lost if it is further from the attractive power of the nucleus. if the electron is lost more easily atom/element is more reactive.
Therefore the reactivity increases down group 1