2.2: Understand How the Differences between the Reactions of these Elements with Air and Water Provide Evidence for the Trend in Reactivity in Group 1

ALKALI  METALS: Group 1 Metals that commonly includes Lithium, Sodium and  Potassium

TREND OF REACTIVITY IN GROUP 1 METALS:

• The reactivity of Group 1 Metals will increase down the Group
• The reaction of Group 1 Metals with Air and Water becomes more vigorous as you go down the Group

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REACTION WITH AIR:

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ELEMENT	REACTION
LITHIUM	Burns with a Red flame
SODIUM	Burns with a Yellow / Orange flame
POTASSIUM	Burns with a Lilac-coloured flame

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REACTION WITH WATER:

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ELEMENT	REACTION
LITHIUM	Bubbles of gas
SODIUM	Bubbles of gas Melts into a shiny ball that dashes around the surface
POTASSIUM	Bubbles of gas Melts into a shiny ball that dashes around the surface Burns with a Lilac-coloured flame