8B.3 Reactions of group 2 elements Flashcards

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1
Q

what onservenstions are made when group 2 metals react with oxygen

A
  1. a very bright flame

2. a formation of a white solid

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2
Q

for the group 2 metal to react with oxygen do they require heat

A

heat is required but they can still react very slowly with the oxygen which would form a surface coating of oxide which would stop the element from further reacting

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3
Q

what is the general formula for group 2 metals when they react with Oxygen

A

2M(s) + O2(g) —->2MO(s)

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4
Q

what is the general formula for group 2 metals reacting with chlorine

A

M(s) + Cl2(g) —–> MCl2(s)

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5
Q

how does the reaction of group 2 metal show their trends

A

1 reaction would oxygen more vigor down the group (brighter flame)

  1. reaction would Cl more vigor
  2. reaction with motor more vigor (more fizzing)
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6
Q

what is the general equation of group 2 metals with water

A

M + 2H2O —-> M(OH)2 + H2

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7
Q

what is the difference when calcium reacts with water

A

since it is more soluble the experiment goes cloudy as calcium hydroxide is formed as

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8
Q

what is the reaction between magnesium and steam

A

as mg is heated by steam it would react very vigorously producing a lot of hydrogen gas and MgO which is a white solid

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9
Q

what is the equation between Mg and H2O

A

Mg(s) + H2O(g) —-> MgO(s)+ H2(g)

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10
Q

what is a safety precaution taken when reacting Mg with hydrogen

A

all of the gas (H2) of burned off to avoid having flammable gas into the labbotory

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11
Q

what is the trend in group 2 metals

A

increase down the group

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