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CHEMISTRY
Inorganic
Group 2
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Created by
Alina Imran
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Cards (100)
What are the elements in Group 2 called?
Alkaline Earth Metals
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How many electrons do Group 2 elements have in their outermost shell?
Two
electrons
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What charge do Group 2 metals form when they become ions?
+2
charge
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Why do Group 2 metals become more reactive down the group?
It becomes easier to lose two
electrons
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What happens to the first and second ionization energies as you go down Group 2?
They
decrease
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What is the first ionization energy?
Energy needed to remove the first
outer electron
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What effect does increased shielding have on ionization energy?
It
decreases
ionization
energy
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How does the atomic radius change going down Group 2?
It increases
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What happens to the melting point of Group 2 elements as you go down the group?
It
decreases
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What is the anomaly in the melting point trend of Group 2 elements?
Magnesium
has a different melting point
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How does density change down Group 2?
Density
drops
then
increases
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What happens to the alkalinity of solutions formed from Group 2 hydroxides as you go down the group?
It increases
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What is the solubility trend of Group 2 hydroxides?
Increases going
down
the group
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What is the general formula for Group 2 hydroxides?
X
(OH)₂
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What happens to the solubility of Group 2 sulfates as you go down the group?
It
decreases
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What is the formula of the ion formed by radium (Ra)?
Ra²⁺
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What is the formula for radium oxide?
RaO
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How does the first ionization energy of radium compare to barium?
Radium's
is
lower
than
barium's
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Why is radium more reactive than barium?
Its
outermost
electrons are further away
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How does the pH of radium hydroxide solution compare to calcium hydroxide?
Radium hydroxide
has a
higher
pH
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What is the solubility of radium sulfate compared to strontium sulfate?
Radium sulfate is
less soluble
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What is the general equation for the reaction of Group 2 oxides with dilute hydrochloric acid?
XO
+ 2HCl →
XCl
+ H₂O
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What is formed when radium hydroxide solution is mixed with dilute sulfuric acid?
A white precipitate of
radium sulfate
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What do Group 2 elements react with?
Oxygen
,
water
, and
dilute
acids
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What color flame does barium produce when burned?
Green flame
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What is the general equation for the reaction of Group 2 metals with water?
M
+ 2H₂O →
M(OH)₂
+ H₂
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Which Group 2 metal does not react with water?
Beryllium
(Be)
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What is the reaction of magnesium with cold water?
Extremely
slow reaction
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How do the reactions of Group 2 metals with water and oxygen differ?
Water reactions produce
hydroxides
, oxygen produces oxides
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What is the general trend in the reactivity of Group 2 metals with dilute acids?
They react
vigorously
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What is the observation when magnesium reacts with dilute hydrochloric acid?
Bubbles of
hydrogen gas
are produced
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What happens to the reactivity of Group 2 metals with oxygen as you go down the group?
It increases
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What are the elements in Group 2 called?
Alkaline earth metals
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How many electrons are in the outermost principal quantum shell of Group 2 elements?
Two
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Why do Group 2 metals become more reactive going down the group?
It becomes easier to remove the
outer
two electrons as the
atomic radius
increases
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What happens to the atomic radius of Group 2 elements going down the group?
It increases
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What happens to the melting point of Group 2 elements going down the group?
It
decreases
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What happens to the density of Group 2 elements going down the group?
It
decreases
and then
increases
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Why do the solutions formed from the reaction of Group 2 oxides with water become more alkaline going down the group?
The solubility of the Group 2 hydroxides increases going down the group, increasing the concentration of OH- ions
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What happens to the solubility of Group 2 sulfates going down the group?
It
decreases
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