2.2 - Group 2 Metals Flashcards

1
Q

Write the first ionisation energy of magnesium.

A

Mg (g) -> Mg^+ (g) +e^-

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2
Q

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

A

It decreases:
- increase in shielding
- increase in atomic radius
- means that there are weaker forces between the outer electron and the nucleus
- so less energy is required to remove the electrons

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3
Q

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

A

Increases (Mg least -> Ba most) because outer electrons are further away from the nucleus and there is more electron shielding, so electrons are lost more easily.

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4
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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5
Q

What is the trend in sulphate solubility down group 2?

A
  • Decreases down the group
  • MgSO4 is soluble
  • BaSO4 is insoluble
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6
Q

What is the trend in MP down group 2?

A

Decreases down the group beacuse the sea of delocalised electrons are futher away from the positive nucleus so there are weaker metallic bonds/ forces of attraction which takes less energy to weaken.

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7
Q

What is the trend in atomic radius down group 2?

A
  • It increases as there more occupied electron shells down the group.
  • It increases down the group due to a greater atomic number.
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8
Q

What are flue gases?

A

Gases produced by power stations which are harmful to the environment.

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9
Q

What is Mg(OH)2 used for?

A

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

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10
Q

What is the 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.

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11
Q
A
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12
Q

Write an equation for the reaction of Barium and water.

A

Ba(s) + 2H20 (l) —>Ba(OH)2 (s) + H2 (g)

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13
Q

Write an equation for the reaction of magnesium and steam.

A

Mg (s) + H2O (g) —> MgO (s) + H2 (g)

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14
Q
A
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