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AQA - A Level - Inorganic Chemistry > 2.4 - Period 3 > Flashcards

2.4 - Period 3 Flashcards

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1
Q

Period 3 metal oxides are ____ compounds?

A

Basic

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2
Q

Equation: Reaction of Sulfur & Oxygen?

A

S₈ + 8O₂ |> 8SO₂

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3
Q

Exceptions of Period 3 elements that react exothermically with oxygen to form oxides?

A

Argon

Chlorine

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4
Q

Equation: Al₂O₃ & HCl

A

Al₂O₃ + 6HCl |> 2AlCl₃ + 3H₂O

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5
Q

Equation: Al₂O₃ & HNO₃

A

Al₂O₃ + 6HNO₃ |> 2Al(NO₃)₃ + 3H₂O

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6
Q

Equation: Al₂O₃ & NaOH

A

Al₂O₃ + 2NaOH + 3H₂O |> 2NaAl(OH)₄

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7
Q

Why are [Al(H₂O)₆]³⁺ ions Acidic?

A

charge on Al³⁺ ion causes electron density in water molecule to move closer to the metal ion & polarises the water molecule, breaking one of the bonds & donating a proton

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8
Q

Reaction of [Al(H₂O)₆]³⁺, H₂O & OH⁻

A

[Al(H₂O)₅OH]²⁺ + H₂O [Al(H₂O)₄(OH)₂]⁺ + H₃O⁺

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9
Q

Observations: Reaction of Sulfur & Oxygen

A

Blue Flame

Choking Gas

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10
Q

Observations: Reaction of Phosphorus & Oxygen

A

White Flame

White Fumes

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11
Q

Observations: Reaction of Silicon & Oxygen

A

v. slow

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12
Q

Observations: Reaction of Aluminium & Oxygen

A

v. slow

White Solid forms

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13
Q

Observations: Reaction of Silicon & Water

A

Does not React with Water

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14
Q

Period 3 ____ oxides are Basic

A

Metal

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15
Q

Why are the Period 3 Metal Oxides Basic?

A

Contain O²⁻ ions that react with water to form OH⁻

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16
Q

Equation: Reaction of MgO & H₂O?

A

MgO + H₂O |> Mg(OH)₂

17
Q

Equation: Reaction of Na₂O & H₂O?

A

Na₂O + H₂O |> 2NaOH

18
Q

pH of NaOH?

A

12-14

19
Q

NaOH: Strong or weak

A

Strong Base

20
Q

pH of Mg(OH)₂?

A

8-10

21
Q

Why does Mg(OH)₂ have a lower pH?

A

less OH⁻ in solution because Mg(OH)₂ is sparingly soluble

22
Q

H₂SO₃: Strong or weak

A

Weak Acid - Equilibrium lies to the left

23
Q

pH of H₂SO₃?

A

2-3

24
Q

pH of H₂SO₄?

A

0-2

25
Q

pH of H₃PO₄?

A

0-2

26
Q

H₃PO₄: Strong or weak

A

Strong Acid

AQA - A Level - Inorganic Chemistry (9 decks)

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