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Chemistry > Period 3 reactions > Flashcards

Period 3 reactions Flashcards

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1
Q

Reaction of sodium with water

A

Na(s) + 2H2O → 2NaOH(aq) + H2(g)

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2
Q

Reaction of magnesium with water

A

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

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3
Q

Reaction of magnesium with steam

A

Mg + H2O → MgO + H2

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4
Q

Reaction of sodium with oxygen

A

2Na + 1/2O2 → Na2O

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5
Q

Reaction of magesium and oxygen

A

2Mg + O2 → 2MgO

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6
Q

Reaction of aluminium with oxygen

A

4Al + 3O2 → 2Al2O3

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7
Q

Reaction of silicon with oxygen

A

Si + O2 → SiO2

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8
Q

Reaction of phosphorous with oxygen

A

4P + 5O2 → P4O10

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9
Q

Reaction of sulphur with oxygen

A

S + O2 → SO2

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10
Q

What is the type of reaction that all period 3 elements undergo in oxygen or water?

A

Redox

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11
Q

Observations in reaction of sodium and water

A

Sodium floats on the surface

fizzing

(heat energy released)

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12
Q

Name the main product formed when sodium reacts with water and give its pH value

A

Sodium hydroxide

13-14

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13
Q

Does Na or Mg react faster with water?

A

Na

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14
Q

Why are very few bubbles seen when magnesium reacts with water?

A

Mg is sparingly soluble

Not all of it dissolves so less hydrogen produced

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15
Q

Name the main product formed when Mg reacts with water and give its pH

A

Mg(OH)2

pH = 10

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16
Q

Why does Mg react faster with steam than water?

A

Higher temp so more kinetic energy

Fully dissociates in steam

17
Q

Are the reactions of period 3 with oxygen exothermic or endothermic?

A

Exothermic

18
Q

Observation when Na reacts with oxygen

A

Burns with bright yellow flame to form white sodium oxide

19
Q

Observation when Mg reacts with oxygen

A

Burns with bright white flame and produces white powder of MgO

20
Q

Why does aluminium appear to be unreactive with air?

A

coated with protective layer of aluminium oxide

Al2O3 is impermeable to air/water

21
Q

What are the conditions required fot the reaction of each type of phosphorous with oxygen?

A

red must be heated before it can react with oxygen

white ignites spontaneously in air

22
Q

Why are there 2 forms of phosphorous and what are they?

A

Red and white phosphorous

Allotropes (same element, dfferent arrangment of atoms)

23
Q

What colour is phosphorous pentoxide?

A

white

24
Q

What product is formed if phosphorous reacts in a limited supply of oxygen?

A

Phosphorous trioxide

P2O3

25
Q

Observation when sulpur reacts with oxygen

A

Blue flame, then produces colourless SO2

26
Q

Why is it difficult to obtain a pure sample of SO2

A

Reacts with oxygen in air to form SO3

(contact process)

27
Q

Why does sodium oxide react with water to form an alkaline solution?

A

Na2O + H2O → 2NaOH

O2- (oxide ion) reacts with water/ accepts a proton

Na2O acts as a base

H2O acts as an acid

28
Q

Ionic equation showing how Al2O3 reacts with HCl

A

Al2O3 + 6H+ → 2Al3+ + 3H2O

29
Q

Ionic equation showing how Al2O3 reacts with NaOH

A

Al2O3 + 2OH- + 3H2O → 2Al(OH)4-

30
Q

Equation for reaction of Na2O + P4O10 in theh absence of water

A

6Na2O + P4O10 → 4Na3PO4

Chemistry (22 decks)

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