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Inorganic Chemistry > Group 2 > Flashcards

Group 2 Flashcards

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1
Q

What is group 2 also known as

A

Alkaline earth metals

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2
Q

What are the metals in group 2

A

Mg
Ca
Sr
Ba

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3
Q

What happens when magnesium reacts in water (steam)

A

Faster reaction
Extra energy
Magnesium oxide and hydrogen gas is produced

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4
Q

What happens when magnesium reacts in water(cold water)

A

Slower reaction
Magnesium hydroxide and hydrogen gas is produced

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5
Q

What is the solubility of group 2 metals in hydroxides

A

As you go down group 2 the more soluble it is

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6
Q

What is the least soluble group 2 hydroxide

A

Magnesium hydroxide which produces a white precipitate as it is insoluble

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7
Q

What is the most soluble group 2 hydroxide

A

Barium hydroxide as it is sparingly soluble

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8
Q

What is the solubility of group 2 in Sulfates

A

As you go down group 2 it becomes less soluble

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9
Q

What is the least soluble group 2 sulfates

A

Barium sulfate white precipitate as it is insoluble

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10
Q

What is the most soluble group 2 sulfate

A

Magnesium sulfate sparingly soluble

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11
Q

What is barium sulfate used for

A

Known as barium meal
Absorb x-rays as barium sulfate is insoluble so can be absorbed

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12
Q

What is magnesium hydroxide used for

A

Known as milk of magnesium /magnesia
Indigestion
Heartburn

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13
Q

What is calcium hydroxide used for

A

Neutralise acidic soil in agriculture

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14
Q

What is magnesium used for (extraction)

A

The extraction of titanium from titanium chloride
2Mg + TiCl4. ➡️ 2MgCl2 + Ti

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15
Q

Why is this extraction process costly

A

Equipment is expensive
Magnesium is expensive
High temperature used 1000 degrees
Batch process

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16
Q

Formula for hydroxides

A

Mg + 2H2O ➡️ Mg(OH)2 + H2

17
Q

What is observed when magnesium is put in water

A

White flame
White powder

18
Q

Formula for sulfates

A

Ba + H2SO4 ➡️ BaSO4 ➕H2

19
Q

Ionic equation for barium sulfate

A

Ba2+ ➕. SO4(2-). ➡️BaSO4

20
Q

Why is barium chloride acidified (test for sulfates)

A

The acid (HCL) reacts the carbonate impurities completely so a false positive result doesn’t happen

21
Q

Why is sulphuric acid not used to test for sulfate ions (test for sulfate ions)

A

As sulphuric acid already contains sulfate ions so it would be a false positive result

22
Q

What is observed when barium chloride reacts to form barium sulfate (test for sulfate ions)

A

White precipitate when sulfate ions are present

23
Q

Use of calcium carbonate / calcium oxide

A

To remove flue gas from sulphur oxide

24
Q

What happens are you go down group 2 in terms of atomic radius

A

Increases
Number of shells increase ,more shielding

25
Q

What happens as you go down group 2 in terms of reactivity

A

Increases
Increase in shielding ,easier to lose electrons from the outermost shell

26
Q

What happens as you go down group 2 in terms of melting point and boiling point

A

Decreases
Larger the ion,weaker force of electrostatic attraction between the nucleus and outer shell electrons
Greater distance to act on

27
Q

What happens as you go down group 2 in terms of ionisation energy

A

Decreases
Increase in number of shells,more shielding
Decrease in nuclear charge
Weaker force of attraction between the positive nucleus and outer shell electron

28
Q

Ionic equation for magnesium hydroxide

A

Mg(2+) ➕ 2OH(-). ➡️ Mg(OH)2

Inorganic Chemistry (2 decks)

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