C2 PPQ Mistakes
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Why is flourine the most reactive halogen
• Flourine is the smallest atom • With the smallest distance between outershell and nucleus • Flourine has the least shielding / greatest attraction between nucleus and outer shell • Flourine can gain electron more easily
Describe condesnation
• Heat the flask up to 100 • Wait for liquid with lower boiling point to evaporate • The cold water on the outsride of the leibig condenser condeses it
Why is chlorine more reactive than bromine
• when you go down a group the size of the atom increases • As there are more shells • There is more shielding between the negative outer electrons and the positive nucleus • makes it harder to gain electrons
observation of the reaction bteween potassium and water
• fizzing • flame • moves around • becomes smaller
why does calcium react more vigourously than magnesium
• Ca outershell electrons are further from the nucleus • so outer electrons are less strongly attracted • more sheilding • positve ion are more easily formed • electrons lost more easiliy
Magnesium, iron and copper are X Y or Z • use dilute HCl • to identify them
• Add same mass and sized particles of metal • to same volume + conc of acid • compare the rate of bubbling • copper will not bubble as it will not react • magnesium will bubble at a higher rate than iron
Why is it incorrect to say that the boiling point of one bromine molecule is 59C
boiling point is a bulk property