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Contents
9F Patterns of Reactivity
Metals and water
Metals and oxygen
Metals and acid
Reactivity series and displacement
Summary activities
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Metals and water
The Romans used lead to make water pipes but didn't know
that lead reacts slowly with water and makes it poisonous!
Some metals react vigorously with water, some metals react
slowly and some do not react at all.
What is the best type of metal to use for water pipes?
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Metals and water ­ general equation
Potassium and sodium are metals that react vigorously with
water even when a small amount of each metal is used.
When a metal reacts with water, the products are a metal
hydroxide and hydrogen gas. What is the general equation
for the reaction of a metal with water?
metal water metal hydrogen
hydroxide
What is the test that a metal hydroxide is produced?
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Metals and water ­ equations
What are the products when each metal reacts with water?
What is the balanced symbol equation for each reaction?
lithium + water lithium + hydrogen
hydroxide
2Li + 2H2O 2LiOH + H2
sodium + water sodium + hydrogen
hydroxide
2Na + 2H2O 2NaOH + H2
potassium + water potassium + hydrogen
hydroxide
2K + 2H2O 2KOH + H2
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Metals and water ­ observations
James investigated how reactive some metals are when
they react with water and made these observations.
Metal Reaction with water
lithium Bubbles of gas are given off quite
quickly. When tested with universal
indicator the water is now alkaline.
sodium The sodium melts and skims over the
surface producing a stream of small
bubbles. Sometimes a yellow-orange
flame appeared.
potassium Potassium immediately produces a lilac
flame as it skims around the surface
making a fizzing noise.
Which of these metals is the most reactive with water?
Which of these metals is the least reactive with water?
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