Properties Of Period 3 Elements Flashcards

1
Q

Sodium reaction w water

A

2Na(s) + 2H2O —-> 2NaOH + H2

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2
Q

Magnesium reaction w water

A

Mg(s) + 2H2O —-> Mg(OH)2 + H2

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3
Q

Sodium reaction w oxygen

A

2Na(s) + 1/2 O2 —-> Na2O

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4
Q

Magnesium reaction w oxygen

A

2Mg(s) + O2 (g) —-> 2MgO

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5
Q

Aluminium reaction w oxygen

A

4Al (s) + 3O2 (g) —-> 2Al2O3

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6
Q

Sodium oxide reaction w water at high high ph

A

Na2O(s) + H2O (l) ——> 2Na+ (aq) + 2OH-

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7
Q

Magnesium oxide reaction with water (ph 9-10)

A

MgO(s) + H2O(l) ——> Mg(OH)2 (aq)

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8
Q

Sodium oxide + sulfuric acid

A

Na2O (s) + H2SO4 (aq) —> Na2SO4(aq) + H2O

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9
Q

phosphorus reaction with oxygen

A

P4(s) + 5O2(g) —-> P4O10

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10
Q

why does Al2O3 have more covalent character than MgO

A

Al3+ ion smaller than Mg2+ ion
means Al3+ more polarising than Mg2+
this distorts elctron cloud around O2- ion more so that there is more elctron density shared between two ions

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11
Q

what does amphoteric mean

A

act as acid or base

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12
Q

does the size of the metal ion increase or decrease as you go across period 3

A

decrease
-inc strentgh of ions

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13
Q

phosphorus oxide reaction w water

A

P4O10 + 6H2O —-> 4H3PO4

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14
Q

what flame forms when you burn sodium in air and what else is produced

A

orange flame to produce white solid mixture of sodium iodide and sodium peroxide

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15
Q

colour flame when magnesium burns in oxygen

A

bright white flame

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