Period 3 elements and thier oxides
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What happens to the radius across the period?
Atomic radius decreases
What happens to the first ionisation across the period?
First ionisation (generally) increases.
What happens to the melting point across the period?
Melting points generally increase then decrease.
What happens to the reactivity down group 2?
Group 2 increase in reactivity down the group.
What happens to the reactivity down group 7?
Group 7 decrease in reactivity down the group.
What is Acidified barium chloride used to test for?
Acidified barium chloride is used to test for sulfate ions, giving a white precipitate.
What is Acidified silver nitrate used to test for?
Acidified silver nitrate is used to test for halide ions a white precipitate for chloride, a cream for bromide and yellow for iodide.
How does sodium react with water?
Sodium reacts vigorously with water.
What happens with sodium reacts with water?
Observations it floats, moves on the surface, fizzes. Forms a silver ball and eventually disappears.
Give the equation for the reaction of sodium and water.
2Na + 2H2O -> 2NaOH + H2
Does sodium and water make an acidic or alkaline solution?
It forms an alkaline pH, the more sodium added the more alkaline.
How does Magnesium react with water?
Magnesium reacts very slowly with water.
Give the equation for the reaction of magnesium and water.
Mg + 2H2O -> Mg(OH)2+ H2
Does magnesium and water make an acidic or alkaline solution?
It has a very slightly alkaline pH.
How does magnesium react with steam?
It reacts vigorously with steam
Give the equation for the reaction of magnesium and steam.
Mg + H20(g) -> MgO + H2O
What would you see when magnesium burns?
Observations: The magnesium burns with a bright white light, white solid is formed (magnesium oxide)
Describe the bonding in sodium oxide
Sodium oxide is an ionic, basic oxide
Give the formula for sodium oxide
Its formula is Na2O
Describe the appearance of sodium oxide
It is a white solid.
Describe and explain the melting point of sodium oxide.
It has a high melting point due to its ionic lattice which has strong electrostatic forces of attraction which require lots of energy to break.
How is sodium oxide formed?
It is formed from the reaction between sodium and oxygen.
What do you see when sodium burns.
A yellow flame is observed and a white solid formed.
What do you have to do to get sodium to burn?
This happens spontaneously in air.