2.4 Period 3 Properties Flashcards

1
Q

Sodium

In Water

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

Sodium

In Oxygen

A

White Solid
Yellow Flame
4Na + O2 → 2Na2O

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3
Q

Magnesium

In Water

A

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

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4
Q

Magnesium

In Oxygen

A

Bright White

2Mg + O2 → 2MgO

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5
Q

Aluminium

In Oxygen

A

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

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6
Q

Silicon

In Water

A

White Powder
White Flame
Si + O2 → SiO2

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7
Q

Phosphorus

In Oxygen

A

Glowing Bright White

P4 + 5O2 → P4O10

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8
Q

Sulfur

In Oxygen

A

Choking Gas

S8 + 8O2 → 8SO2

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9
Q

Chlorine

In Water

A

Dissolves
Pale Green solution
Cl2 + H2O → HClO + HCl

HClO will kill bacteria

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10
Q

Trends in Melting Point of Period 3 Elements

A

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

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11
Q

Sodium Oxide

In Water

A

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

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12
Q

Sodium Oxide

In Acid

A

Basic Oxide

Na2O + 2HCl → 2NaCl + H2O

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13
Q

Magnesium Oxide

In Water

A

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

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14
Q

Magnesium Oxide

In Acid

A

Basic Oxide

MgO + H2SO4 → MgSO4 + H2O

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15
Q

Aluminium Oxide

In Acid

A

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

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16
Q

Aluminium Oxide

In Alkalis

A

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

17
Q

Silicon Dioxide

In Alkalis

A

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

18
Q

Phosphorus Oxide
P4O10

In Water

A

Violently reacts

P4O10+ 6H2O → 4H3PO4

19
Q

Phosphorus Oxide

In Alkali

A

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

20
Q

Sulfur Dioxide

In Water

A

Not violent

SO3 + H2O → H2SO4

21
Q

Sulfur Dioxide

In Alkali

A

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

22
Q

Trends in the melting points of Period 3 OXIDES

A

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