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Flashcards in period 3 Deck (39)
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1

appearance and physical properties of sodium

metallic
shiny
worst conductor

2

reaction of sodium with acid

Na + acid = H2 + salt

3

reaction with sodium with cold water

vigorous reaction, floats, fizzes, melts
due to - delta H
NaOH ph 13-14
2Na + 2 H2O = 2NaOH + H2

4

reaction of sodium with oxygen

bright yellow flame, forms white powder
2Na + 1/2O2 = Na2O

5

appearance and physical properties of magnesium

metallic
shiny
conducts electricity

6

reaction of Mg with cold water

very slow reaction
ph 10 Mg(OH)2
Mg + 2H2O = H2 + Mg(OH)2

7

reaction of Mg with steam

Mg + H2O = MgO + H2

8

reaction of Mg with oxygen

bright yellow flame, forms white powder
2Mg + O2 = 2MgO

9

appearance and physical properties of aluminium

metallic
shiny
best conductor

10

reaction of Al with cold water

no reaction

11

reaction of Al with oxygen

bright flame
forms white powder
4Al + 3O2 = 2Al2O3

12

why is Al considered unreactive

covered in Al2O3 which is unreactive

13

appearance and physical properties of silicone

semimetal (metalloid)
semiconductor

14

reaction of silicone with oxygen

Si + O2 = SiO2

15

appearance and physical properties of phosphorus

non-metal
low mp/bp
does not conduct
red as a crystal structure
white as P4

16

reaction of phosphorous in excess oxygen

4P + 5O2 = P4O10

17

reaction of phosphorous in limited oxygen

4P +3O2 = P4O6

18

appearance and physical properties of sulfur

non metal
low mp/bp
does not conduct electricity

19

reaction of sulfur with oxygen

colourless gas
S + O2 = SO2

20

different types of structure and bonding by period 3 oxides

Na ionic lattice
ionic lattice
ionic lattice with covalent character
giant covalent
simple covalent
S simple covalent

21

trend in melting point p3 oxides

increases along group fpr metals due to strong ionic bonding, Al2O3 is lower due to covalent character.
decreases with size for simple molecular molecules

22

which p3 oxides are basic

Na2O
MgO

23

Na oxide with water

Na2O + H2O = 2Na+ + 2OH-

24

Mg oxide with water

MgO + H2O = Mg2+ + 2OH- = Mg(OH)2

25

what are the products if Na2O and MgO react with acid

salt and water only

26

is aluminium oxide acidic or basic

amphoteric

27

aluminium oxide with HCl

Al2O3 + 6HCl = 3H2O + 2AlCl3

28

aluminium oxide with NaOH

Al2O3 + 2NaOH + 3H2O = 2NaAl(OH)4

29

in what conditions will silicon dioxide act as an acid

reacts as a weak acid in a strong base

30

silicon dioxide with hot conc NaOH

SiO2 + 2NaOH = H2) + Na2SiO3