Group 2 Flashcards

1
Q

Write an equation for the first ionisation energy of magnesium

A

Mg (g) → Mg+ (g) + e-

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2
Q

Explain why FIE increases as you go across period 3

A

First Ionisation energy increases across period 3 because of increased nuclear charge, decreased atomic radius and same electron shielding means more energy is needs to remove the first electron.

Dips at Al because: outer electron is in a 3p orbital, higher energy than 3s orbital → less energy needed to remove electron.

Dips at S because one 3p orbital contains two electrons → repulsion between paired electrons → less energy needed to remove one.

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3
Q

What happens to the first ionisation energy as you go down group 2? Why?

A

Decreases because: number of filled electron shells increases down the group → increased shielding, increased atomic radius → weaker force between outer electron and nucleus → less energy needed to remove electron.

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4
Q

How does reactivity with water change as you go down group 2?

A

Increases (Mg least → Ba most)

Because outer electrons further from nucleus and more electron shielding, so electrons are lost more easily.

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5
Q

Write an equation for the reaction of Barium and water

A

Ba (s) + 2H2O (l) → Ba(OH)₂ (aq) + H₂ (g)

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6
Q

Write an equation for the reaction of Magnesium and steam.

A

Mg (s) + H₂O (g) → MgO (s) + H₂ (g)

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7
Q

What is the trend in hydroxide solubility down group 2?

A

Increases down the group

Mg(OH)₂ is almost insoluble

Ba(OH)₂ creates a strong alkaline solution

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8
Q

What is the trend in sulphate solubility down group 2?

A

Decreases down group

MgSO₄ is soluble

BaSO₄ is insoluble

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9
Q

What is the trend in melting point down group 2? Why?

A

Decreases down group

Because sea of delocalised electrons is further from the positive charge of the nucleus → weaker metallic bonds / forces of attraction which take less energy to weaken

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10
Q

What is the trend in atomic radius down group 2?

A

Increases as there are more occupied electron shells down the group

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11
Q

Write the equations for the extraction of Titanium using Magnesium.

A

TiO₂ + 2Cl₂ + C → TiCl₄ + CO₂

TiCl₄ (l) + 2Mg (s) → 2MgCl₂ (s) + Ti (s)

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12
Q

What are flue gases?

A

Gases produced by power stations which are harmful to the environment

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13
Q

How can CaO or CaCO3 be used to remove flue gases? Write equations

A

CaCO₃ (s) + SO₂ (g) → CaSO₃ (s) + CO₂ (g)

CaO (s) + SO₂ (g) → CaSO₃ (s)

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14
Q

What is Ca(OH)2 used for? Write an equation related to one of its uses

A

Used to neutralise soil

Ca(OH)₂ (aq) +2HCl (aq) → 2H₂O (l) + CaCl₂ (aq)

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15
Q

What is Mg(OH)2 used for?

A

Milk of magnesia - antacid to treat indigestion, heartburn, wind etc.

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16
Q

What is a use of BaSO4? Why is it safe?

A

In barium meals to outline gut in X-rays

Ba²+ is toxic but is fine as barium sulphate is insoluble

17
Q

How can BaCl2 be used to test for sulfate ions?

A

Add to sample with HCl, white ppt will form if sulfate ions present.

Ba2+ + SO42- -> BaSO4