Period 3 Elements Flashcards

1
Q

Which is more reactive from Na and Mg? (1 mark)

A

⦾ Na (1)

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2
Q

Which has the higher melting point from Na and Mg?

1 mark

A

⦾ Mg (1)

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3
Q

Why is Sodium more reactive than Magnesium? (3 marks)

A

⦾ Na from group 1 and Mg from group 2 (1)
⦾ (so) Na loses 1e- to form Na+and Mg loses 2e- to form Mg2+ (1)
⦾ (therefore) less energy to lose 1e- than 2e- (1)

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4
Q

What can be observed when sodium reacts with cold water? (4 marks)

A

⦾ vigorously (1)
⦾ molten ball on surface (1)
⦾ (produces) H2 gas (1)
⦾ (and) strongly alkaline solution (1)

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5
Q

Why is an alkaline solution produced when sodium reacts with cold water? (1 mark)

A

⦾ NaOH produced (1)

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6
Q

What is the balanced equation for the reaction of sodium with cold water? (2 marks)

A

⦾ 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) (2)

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7
Q

What can be observed when magnesium reacts with cold water?

A

⦾ very slowly - not very soluble (1)
⦾ thin magnesium hydroxide coating on surface of metal (1)
⦾ (produces) H2 gas (1)
⦾ weakly alkaline (1)

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8
Q

What is the balanced equation for the reaction of magnesium with cold water? (2 marks)

A

⦾ Mg(s) + 2H2O(l) → Mg(OH)2(aq) + H2(g) (2)

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9
Q

What is produced when magnesium reacts with steam?

A

⦾ MgO(s) and H2(g) (1)

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10
Q

What is the balanced equation for the reaction of magbesium with cold water? (1 mark)

A

⦾ Mg(s) + H2O(g) → MgO(s) + H2(g) (1)

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11
Q

What do most period 3 elements form when they react with oxygen? (1 mark)

A

⦾ oxides

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