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OCR AS Alkaline Earth Metals GII Flashcards | StudBud
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OCR AS Alkaline Earth Metals GII
OCR AS Alkaline Earth Metals GII
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Group II, Periodic Table, oxidation numbers
Flashcards
16 cards
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Questions
16
Answers
1
definition? ‘The ability of an atom to attract electrons in a covalent bond’
A.Ionisation energy
B.Electron affinity
D.Electronegativity
C.Bond enthalpy
2
Complete the equation: SrO (s) + HCl (aq) ->
Sr(OH)2 + H2O
SrCl + H2O
SrCl2 + H2O
SrO + H2O
3
Explain the trend in ionisation energy
more protons
more electrons in outer shell
stronger london dispersion forces
greater distance from nucleus to outer shell
4
In this react, what happens to the strontium?
It is reduced
It is oxidised
It does not change oxidation state
5
Group 2 elements get more reactive down the group as the ionisation energies decrease
True
False
I'm not sure
6
Which factor is crucial in explaining this trend going down group 2?
smaller ions generally have stronger metallic bonding
more protons
larger ions generally have stronger metallic bonding
the charge on the cations increases
7
Definition? 'energy required to remove 1 mole of electrons from 1 mole of gaseous atoms'
1st ionisation energy
electronegativity
1st electron affinity
empirical formula
8
Why do Group 2 atoms get bigger?
They have less electronegativity
Their outer electrons are in s orbitals
There are more shells of electrons
They have more protons in the nucleus
9
When barium is added to water, you would observe?
The barium sinks
The barium catches fire
The barium floats
The barium whizzes around on the surface
10
Group 2 hydroxides become less soluble as you descend the group
True
False
11
As you descend group 2, the atoms…
Get smaller
Have more outer shell electrons
Get bigger
Have higher electronegativity
12
Electronegativity generally increases as you go across a period from left to right
True
False
13
True or False? Group II elements get less reactive down the group
false
true
14
What are the products formed when barium is added to water?
BaO + H2
Ba(OH)2 + H2
Ba(OH)2 + O2
BaO + O2
15
What type of reaction? Mg (s) + H
2
O (g) → MgO (s) + H
2
(g)
hydrolysis
precipitation
endothermic
redox
16
The melting points of group 2 elements depend on the strength of which type of bonding?
metallic
ionic
covalent
dipole to dipole attraction
