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A Level Chemistry > Period 3 > Flashcards

Period 3 Flashcards

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1
Q

What is the equation for sodium reacting with water?

A

2Na(s) + 2H2O(l) -> 2NaOH(aq) + H2(g)

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2
Q

What is the observation for sodium reacting with water?

A

Orange flame

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3
Q

What is the equation for sodium reacting with oxygen?

A

4Na(s) + O2(g) -> 2Na2O(s)

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4
Q

What is the observation for sodium reacting with oxygen?

A

Bright yellow flame

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5
Q

What is the equation for magnesium reacting with water?

A

Mg(s) + H2O(g) -> MgO(s) + H2(g)

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6
Q

What is the observation for magnesium reacting with water?

A

Bubbles

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7
Q

What is the equation for magnesium reacting with oxygen?

A

2Mg(s) + O2(g) -> 2MgO(s)

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8
Q

What is the equation for aluminium reacting with water?

A

N/A

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9
Q

What is the equation for aluminium reacting with oxygen?

A

4Al(s) + 3O2(g) -> 2Al2O3 (s)

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10
Q

What is the observation for aluminium reacting with oxygen?

A

Bright white flame

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11
Q

What is the equation for silicon reacting with water?

A

N/A

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12
Q

What is the equation for silicon reacting with oxygen?

A

Si(s) + O2(g) -> SiO2(s)

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13
Q

What is the observation for silicon reacting with oxygen?

A

Bright white sparkles.

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14
Q

What is the equation for phosphorous reacting with water?

A

N/A

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15
Q

What is the equation for phosphorous reacting with oxygen?

A

4P(s) + 5O2(g) -> P4O10(s)

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16
Q

What is the observation for phosphorous reacting with oxygen?

A

Yellow or white flame

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17
Q

What is the equation for sulphur reacting with water?

A

N/A

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18
Q

What is the equation for sulphur reacting with oxygen?

A

S(s) + O2(g) -> SO2(g)
(can also form SO3)

19
Q

What is the observation for sulphur reacting with oxygen?

A

Blue flame

20
Q

What is the equation for chlorine reacting with water?

A

Cl2(aq) + H2O(l) -> HCl (aq) + HClO(aq)

21
Q

What is the observation for chlorine reacting with water?

A

Green solution

22
Q

What is the equation for chlorine reacting with oxygen?

A

N/A

23
Q

What is the equation for Na2O and water?

A

Na2O(s) + H2O(l) -> 2NaOH(aq)

24
Q

What is the solubility and pH of Na2O and water?

A

Completely soluble, 14

25
Q

What is the equation for MgO and water?

A

MgO(s) + H2O(l) -> Mg(OH)2(aq)

26
Q

What is the solubility and pH of MgO and water?

A

Slightly soluble, 8

27
Q

What is the equation for Al2O3 and water?

A

N/A

28
Q

What is the solubility and pH of Al2O3 and water?

A

Insoluble, 7

29
Q

What is the equation for SiO2 and water?

A

N/A

30
Q

What is the solubility and pH of SiO2 and water?

A

Insoluble, 7

31
Q

What is the equation for P4O10 and water?

A

P4O10(s) + 6H2O(l) -> 4H3PO4(aq) <=> H+ + H3PO4-

32
Q

What is the pH of P4O10 and water?

A

3

33
Q

What are the two equations for SO2(g) and water?

A

SO2(g) + H2O(l) -> H2SO3(aq) <=> H+ + H3PO4-
SO2(g) + H2O(l) -> H2SO4(aq)

34
Q

What is the equation for Na2O and H2SO4?

A

Na2O(s) + H2SO4(aq) -> Na2SO4(aq) + H2O(l)

35
Q

What is the equation for MgO and H2SO4?

A

MgO(s) + H2SO4(aq) -> MgSO4(aq) + H2O(l)

36
Q

What is the equation for P4O10 and NaOH?

A

P4O10(s) + 12NaOH -> 4Na3PO4(aq) + 6H2O(l)

37
Q

What is the equation for SO2 and NaOH?

A

SO2(g) + NaOH(aq) -> Na2SO3(aq) + H2O(l)

38
Q

What is the equation for SO3 and NaOH?

A

SO3(g) + 2NaOH(aq) -> Na2SO4(aq) + H2O(l)

39
Q

What is the equation for Al2O3 and H2SO4?

A

Al2O3(s) + 3H2SO4(aq) -> Al2(SO4)3(aq) + 3H2O(l)

40
Q

What is the equation for Al2O3 and NaOH?

A

Al2O3(s) + NaOH(aq) + 3H2O(l) -> 2NaAl(OH)4(aq)

41
Q

Define amphoteric. Which period three element is amphoteric, why?

A

Has acidic and basic properties, can react with acids and bases. Aluminium, has ionic and covalent character.

42
Q

Explain the trend in atomic radius across period three.

A

Radii decrease across the period because the nuclear charge increases and there is similar shielding. So the nucleus attracts the electrons more strongly and the radius decreases.

43
Q

Why do some oxides form alkaline solutions?

A

Because they produce hydroxide ions, more soluble more alkaline.

A Level Chemistry (26 decks)

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