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chem exam questions > group 2 > Flashcards

group 2 Flashcards

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1
Q

what is the name of group 2?

A

alkaline earth metals

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2
Q

which sub shell is outer electron in?

A

2s subshell

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3
Q

explain trend in reactivity DOWN group 2 (4)

A

P- more protons
S- more shells and more shielding
D- distance between nucleus and outer shell increases
S- strength of attraction decreases

easier to remove outer 2 electrons so reactivity INCREASES going DOWN group 2

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4
Q

why do group 2 metals have a high boiling point?

A
  • strong metallic bonds (strong electrostatic attraction between cations and delocalised electrons)
  • requires lots of energy to overcome
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5
Q

give the equation of Mg and oxygen

A

2Mg + O2 -> 2MgO

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6
Q

give the equation of Mg and steam and explain why Mg cannot react with water but with steam

A

Mg is too unreactive, needs steam as steam has more energy

Mg + H20 (g)-> MgO (s)+ H2

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7
Q

give equation of Ba and water

A

Ba + H20 -> Ba(OH)2 + H2

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8
Q

give 2 observations when metal reacts with water

A
  • solid disappears as it is used up
  • effervescence as hydrogen gas forms
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9
Q

Metal + Acid -> ?

A

salt + hydrogen

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10
Q

define salt

A

when H+ of an acid is replaced with a NH4+ ion or a metal ion

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11
Q

give the ion of ethanoic acid

A

CH3COO-

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12
Q

Metal oxide + water -> ?

A

metal hydroxide

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13
Q

compare pH of Mg(OH)2 and Ba(OH)2

A

Mg(OH)2- 9 insoluble
Ba(OH)2- 13 very soluble
Ba is more alkaline and contains more OH- ions so has a higher pH

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14
Q

acid + alkali -> ?

A

salt + water

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15
Q

acid + base -> ?

A

salt + water

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16
Q

acid + carbonate -> ?

A

salt + water + CO2

17
Q

give a use of group 2 element in agriculture

A

‘lime’ (calcium hydroxide) is used to neutralise soils

18
Q

give a use of group 2 elements in medicine

A

indigestion tablets
Mg(OH)2 or CaCO3
neutralise excess stomach acid which is HCL

chem exam questions (10 decks)

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