C4d: The Group 1 Elements

This item studies the properties of the Group 1 elements. The item links the similarity of their properties to the position of the elements in the periodic table.

 

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Why are the group 1 elements known as the alkali metals?
Because they form alkaline solutions when they react with water.
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Why are the group 1 elements stored under oil?
Because they are very reactive with air and water, so they need to be kept away from them.
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What is formed during the reaction between Lithium/Sodium/Potassium and water?
Hydrogen is formed, An alkali is also formed which is the hydroxide of the metal.
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What happens to reactivity as you go down the group 1 elements?
Reactivity increases.
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What colour flame does potassium give when reacting with water?
A Lilac flame.
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What colour flame does sodium produce in the flame test?
Red
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What colour flame does lithium produce in the flame test?
Orange
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What colour flame does potassium produce in the flame test?
Lilac
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What is the general word equation for a metal reacting with water?
Metal + water = Metal hydroxide + Hydrogen
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Predict what will happen during the reaction between rubidium and water.
An explosion with sparks.
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Predict what will happen during the reaction between caesium and water.
Violent explosion due to rapid production of heat and hydrogen
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What happens during the reaction between potassium and water?
Ignites with sparks and a lilac flame, disappears very quickly
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What happens during the reaction between sodium and water?
Fizzes rapidly, melts into a ball and disappears quickly
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What happens during the reaction between lithium and water?
Fizzes steadily, gradually disappears
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What's the symbol for a hydroxide?
OH
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What's the symbol for a hydrogen?
H2
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What is Lithium's melting point?
181°C
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What is Sodium's melting point?
98°C
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What is Potassium's melting point?
63°C
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What is Rubidium's melting point?
39°C
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What is Caesium's melting point?
29°C
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Why do group 1 elements have similar properties?
Because of the electronic structure of their atoms. They all have one electron in their outer shell.
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Describe how to use a flame test.
A cleaned, moistened flame test wire is dipped into a solid sample of the compound and then put into a blue Bunsen flame. The flame colour indicates which alkali metal ion is present in the compound.
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How can you tell oxidation has occurred by it's ionic equation?
An electron is lost - becomes positive.
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Why does reactivity increase as you go down group 1?
Atoms are larger, outer shell further away from the nucleus, the attraction between the outer shell and nucleus is weaker, so the electron gets lost easier.
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What happens when an atom in group 1 reacts?
It forms an ion with a single positive charge. E.g. Na – e^– → Na^+. The ions formed have a stable electronic structure, like a noble gas from Group 0.
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Other cards in this set

Card 2

Front

Why are the group 1 elements stored under oil?

Back

Because they are very reactive with air and water, so they need to be kept away from them.

Card 3

Front

What is formed during the reaction between Lithium/Sodium/Potassium and water?

Back

Preview of the front of card 3

Card 4

Front

What happens to reactivity as you go down the group 1 elements?

Back

Preview of the front of card 4

Card 5

Front

What colour flame does potassium give when reacting with water?

Back

Preview of the front of card 5
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