Group 2 Flashcards

1
Q

trend in atomic radius down the group

A

increases
as more shells of electrons
so bigger atoms

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2
Q

trend in melting point down the group

A

decrease
size increases - metallic bonding weakens
so greater distance between positive ions + delocalised electrons
so electrostatic force weakens

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3
Q

trend in 1st ionisation energy

A
  • outer electrons = further from nucleus
  • outer electrons= more shielded + repelled by inner electrons
  • less attraction to nucleus
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4
Q

reactivity down the group with oxygen

A

inreases

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5
Q

G2… with O2

A

burns

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6
Q

Mg + o2 produces?

A
  • 2Mg + O2 👉 2MgO
  • a white flame
  • a solid with high mp due to ionic bonding
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7
Q

how does Mg react with o2 without a flame?

A

slowly

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8
Q

mg + steam produces?

A
  • magnesium oxide + hydrogen

- Mg burns with bright white flame

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9
Q

equation for mg + steam

A

Mg (s) + H2O (g) 👉 MgO (s) + H2(g)

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10
Q

mg + warm water produces?

A
  • magnesium hydroxide
  • slower reaction than with steam
  • no flame
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11
Q

equation for mg + water

A

Mg + 2 H2O 👉Mg(OH)2 + H2

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12
Q

other g2 metals react with …..water?

A

cold

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13
Q

g2 + water produces

A

hydroxides

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14
Q

does reactivity with water increase or decrease down the group?

A

increase

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15
Q

observations of reactions with water + intensity (4)

A
  • fizzing
    • more vigorous down the group
  • metal dissolving
    • faster down the group
  • solution heating up
    • more down the group
  • calcium has white ppt
    • less down the group
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16
Q

write the Ba + H20 with state symbols

A

Ba + 2 H2O (l) 👉 Ba(OH)2 (aq) + H2(g)

17
Q

if soluble, what do hydroxides make the water?

A

alkaline