Because it takes lesss nearby to remove 1 electron than to lose 2 therefore more energy needed for magnesium to react, this is shown by the reactions with water
1 of 18
What happens when sodium reacts with cold water
Sodium react vigorurouly, forms a molten ball on the surface, fizzing and poeoscing H2 gas . This reaction produces sodium hydroxide, so creates a stormgly alakaline solurion pH(12-14)
2 of 18
Write the equation for reaction between sodium and cold water
Look in textbook
3 of 18
What happens when magnesium reacts with cold water
Magnesium reacts very slowly with cod wgee. It forms an weakly alaklaine solutoon(pH9-10) and a thin coating of magnesium huddoxide form on surface of metal
4 of 18
Why is the solution only weakly alkaline
Because magnesium hydroxide is not soluble in water therefore relatively few hydroxide ions are produced.
5 of 18
Write the equations for reaction between magnesium and cold water
Look in textbook
6 of 18
What do period 3 elects form when react with oxygen
Period 3 elects form oxides when they react with oxygen, usually oxidised to their highest oxidation state, same as group number
7 of 18
Bonding and structure of Na2O, MgO, Al2O3 ?
These are all metal oxides. Have high melting points becasue form giant ionic lattices. Strong forces of attraction between each ion means takes lots of heat nearby to break the bonds and melt them
8 of 18
Explain MgO
MgO ha shigher melting point than Na2O because Mg forms 2+ ions, so bonds more strongly than the 1+ Na+ ions in Na2O
9 of 18
ExplIn Al2O3?
Has lower melting point that expected becasue highly charges Al3+ ions distort the oxygens electron cloud making the bonds partially covalent
10 of 18
Explain SiO2
Has highest melting point out of other non metal oxides, becasue has a giant macromolecular structure, strong covalent bonds between atoms means more energy to break
11 of 18
Explain P4O10 and SO2
Have relatively low melting points becasue they form simple molecular structures. Molecules bound by weak intermolecular drives (dipole-dipole and van ded waal a) which take little energy to break
12 of 18
What are ionic oxides and what are covalent oxides
Ionic oxides are alkaline Covalent oxides are acidic
13 of 18
Why are ionic oxides of the metals Na and Mg alakaline
Both contain Oxide ions when they dissolve in water the o2- ions accept protons from the water molecules to form hydroxide ions. Solutions both alakaline but sodium hydroxide more soluble in water so form more alkaline solution that magnesium hydroxi
14 of 18
Why do simple covalent oxides of phosphorus and sulfur form acidic solutions?
All of th acids are strong pH0-2. They will dissociate(split into ions) in solution, forming hydrogen ions and a negative ions (sometimes called a conjugate base)
15 of 18
What does the giant covalent structure of silicon dioxide men's
Means it's insoluble in water. Hiwveer will react with abses or fork salts so classed as acidic
16 of 18
Explain alimuium oxide
Is partially ionic and partially covalentally bonded, also insoluble in water but reacts with acids and bases to form salts . CAN ACT AS ACID OR BASE SO CLASSED AS AMPHOTERIC
17 of 18
General neautralisation equation
Acid+Base--- Salt and water
18 of 18
Other cards in this set
Card 2
Front
What happens when sodium reacts with cold water
Back
Sodium react vigorurouly, forms a molten ball on the surface, fizzing and poeoscing H2 gas . This reaction produces sodium hydroxide, so creates a stormgly alakaline solurion pH(12-14)
Card 3
Front
Write the equation for reaction between sodium and cold water
Back
Card 4
Front
What happens when magnesium reacts with cold water
Comments
No comments have yet been made