2.4 Period 3 Properties Flashcards Preview

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Flashcards in 2.4 Period 3 Properties Deck (22):
1

Sodium

In Water

Vigorous reaction
pH= 13-14
Fizz
Effervescence
2Na + 2H2O → 2NaOH

2

Sodium

In Oxygen

White Solid
Yellow Flame
4Na + O2 → 2Na2O

3

Magnesium

In Water

Less Vigorous
Small Fizz
Mg + 2H2O → Mg(OH)2 + H2

4

Magnesium

In Oxygen

Bright White
2Mg + O2 → 2MgO

5

Aluminium

In Oxygen

White powder
White Flame
2Al + 3O2 → 2Al2O3

6

Silicon

In Water

White Powder
White Flame
Si + O2 → SiO2

7

Phosphorus

In Oxygen

Glowing Bright White
P4 + 5O2 → P4O10

8

Sulfur

In Oxygen

Choking Gas
S8 + 8O2 → 8SO2

9

Chlorine

In Water

Dissolves
Pale Green solution
Cl2 + H2O → HClO + HCl

HClO will kill bacteria

10

Trends in Melting Point of Period 3 Elements

Increases Na→ Al
1) Nuclei of atom is more +ve charged
2) Sea of e- is more -ve
3) Greater amount of attraction

Silicon
1) Giant covalent has many strong bonds to break

P4 → Cl2
1)P4 has weak VanDeWaals
2)S8 is larger than P4 so more VanDeWaals
3) Cl2 is very small so has weakest bonds

11

Sodium Oxide

In Water

Dissolves
pH= 13-14
Na2O + H2O → 2Na+ + 2OH-

12

Sodium Oxide

In Acid

Basic Oxide
Na2O + 2HCl → 2NaCl + H2O

13

Magnesium Oxide

In Water

Not very soluble but dissolves
pH =9
MgO + H2O → Mg(OH)2

14

Magnesium Oxide

In Acid

Basic Oxide

MgO + H2SO4 → MgSO4 + H2O

15

Aluminium Oxide

In Acid

Insoluble
Amphoteric
Al2O3 + 6HCl → 2AlCl3 + 3H2O

16

Aluminium Oxide

In Alkalis

Insoluble
Amphoteric
Al2O3 + NaOH +3H2O → 2NaAl(OH)4

17

Silicon Dioxide

In Alkalis

Insoluble
pH = 7
Weak Acid
SiO2 + 2NaOH → Na2SiO3 + H2O

18

Phosphorus Oxide
P4O10

In Water

Violently reacts
P4O10+ 6H2O → 4H3PO4

19

Phosphorus Oxide

In Alkali

Acidic Oxide
pH= 1-2
P4O10 + 12NaOH → 4Na3PO4 + 6H2O

20

Sulfur Dioxide

In Water

Not violent
SO3 + H2O → H2SO4

21

Sulfur Dioxide

In Alkali

SO3 + NaOH → NaHSO4
Strong Acidic Oxide
pH= 0-1

22

Trends in the melting points of Period 3 OXIDES

Giant Structure
1) Na2O → SiO2
2)High energy to break strong bonds

P4O10, SO2, SO3
1) simple molecular
2)energy to break VanDeWaals
3) varies with size, polarity, shape