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s-block Flashcards

1
Q

Write the products of Li with Oxygen gas

A

Li2O

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2
Q

Write the products of Na with Oxygen gas

A

Na2O

Na2O2 (excess oxygen)

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3
Q

Write the products of K with Oxygen gas

A

K2O

K2O2

KO2

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4
Q

Write the products of Rb with Oxygen gas

A

Rb2O

Rb2O2

RbO2

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5
Q

Write the products of Cs with Oxygen gas

A

Cs2O

Cs2O2

CsO2

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6
Q

What’s the only element that reacts with nitrogen gas in first group?

A

Li

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7
Q

Write the reactions of Li with N2 gas

A

Li —> Li3N

Li3N +3H20 —> 3LiOH + NH3

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8
Q

How do 1st group elements react with hydrogen gas?

A

Li –> LiH
Na –> NaH
K –> KH
Cs – CsH
Rb –> RbH

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9
Q

What’s the nature of group 1 hydrides?

A

Ionic

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10
Q

How do group 1 hydrides react w water?

A

They react vigorously

NaH + H2O –> NaOH + H2

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11
Q

Write the reactions of group 1 metals with cold water?

A

Na + H20 —> NaOH + H2

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12
Q

Write the nature of the reactions of group1 metals reacting w cold water

A

Li –> Gently
Na –> Vigorously
K –> Vigorously w/ ignition
Rb/Cs –> Explosively

Na, K, Rb, Cs show exothermic reactions

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13
Q

How do the group 1 oxides react with water?

A

Li2O + H2O –> LiOH
Na2O + H20 –> NaOH
K2O + H2O –> KOH

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14
Q

Explain the variation of the base strength of first group metals down the group

A

increases

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15
Q

What’s the reaction of group 1 peroxides w water?

A

Na2O2 + H2O –> NaOH + H2O2

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16
Q

What’s the reaction of 1st group superoxide w water?

A

KO2 + H2O –> KOH + H202 + O2

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17
Q

Describe the reaction of acids with group 1 metals

A

Forms the salt and hydrogen gas

Na + HCl —> NaCl + H2

Li + H2SO4 –> Na2SO4 + H2

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18
Q

Describe the reactions of group 1 metal hydroxides with CO2

A

NaOH + CO2 –> Na2CO3 + H2O

Na2CO3 + CO2 + H20 –> NaHCO3

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19
Q

Write the products of Be with oxygen gas

A

BeO

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20
Q

Write the products of Mg with oxygen gas

A

MgO

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21
Q

Write the products of Ca with oxygen gas

A

CaO

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22
Q

Write the products of Sr with oxygen gas

A

SrO

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23
Q

Write the products of Ba with oxygen gas

A

BaO

BaO2

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24
Q

Write the reactions of group 2 elements with nitrogen gas

A

M + N2 —> M3N2 (yellow)

M3N2 + H20 –> M(OH)2 + NH3

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25
Which group 2 element doesn't react with Hydrogen gas?
Be
26
Do all group 2 elements react w hydrogen gas?
No. Be doesn't
27
Write the products of group 2 metals reacting w hydrogen gas
Mg + H2 --> MgH2 ( at high pressure) Ca + H2 --> CaH2 (at high temp.) Sr + H2 --> SrH2 (at high temp.) Ba + H2 --> BaH2 (at high temp.) Then: CaH2 + H20 --> Ca(OH)2 + 2H2 (not violent as group 1)
28
Write the nature of the group 2 metallic hydrides
They're all ionic solids. Ionic character increases down the group
29
Describe the reactivity of Be with water
Be doesn't react with room temperature water, cold water or hot water It reacts with steam as: Be + H2O --> BeO + H2
30
Describe the reactivity of Mg with water
Doesn't react with cold water or room temperature water Reacts SLOWLY with hot water Mg + 2H2O ---> Mg(OH)2 + H2 Reacts with steam
31
Describe the reactivity of Ca/Sr/Ba with water
Readily reacts with water Ca + H20 --> Ca(OH)2 + H2 Reacts with steam
32
How does reactivity of group 2 metals with water vary?
it increases down the group
33
Write reactions of group 2 metals with dilute acids
Do not act as oxidizing agents Mg + HCl --> MgCl + H2
34
Write reactions of group 2 metals with concentrated acids
They show oxidizing properties with H2SO4 and HNO2 Mg + H2SO4 --> MgSO4 + SO2 + 2H20 Mg + HNO3 --> Mg(NO3)2 + NO2 + H20 They don't show oxidizing properties w HCl Mg + HCl --> MgCl + H2
35
How do group 1 hydroxides decompose?
LiOH ---> Li2O + H2O NaOH --> do not decompose KOH --> do not decompose RbOH --> do not decompose
36
How do group 2 hydroxides decompose?
Be(OH)2 --> BeO + H2O Mg(OH)2 --> MgO + H2O Ca(OH)2 --> CaO + H2O Sr(OH)2 --> SrO + H2O Ba(OH)2 --> BaO + H20
37
What's the only group 1 hydroxide that decomposes?
LiOH
38
How do group 1 carbonates decompose?
Li2CO3 --> Li2O + CO2 Na2CO3 --> do not decompose K2CO3 --> do not decompose Rb2CO3 --> do not decompose Cs2CO3 --> do not decompose
39
What's the only group 1 carbonate that can decompose?
Li2CO3
40
How do group 2 carbonates decompose?
BeCO3 --> BeO + CO2 MgCO3 --> MgO + CO2 CaCO3 --> CaO + CO2 SrCO3 --> SrO + CO2 BaCO3 --> BaO + CO2
41
Describe the physical nature of group 1 bicarbonates
LiHCO3 --> Aqueous solution NaHCO3 --> solid KHCO3 --> solid RBHCO3 --> solid
42
Describe the decomposition of bicarbonates of group 1
LiHCO3 ---> Li2CO3 + CO2 + H20 NaHCO3 ---> Na2CO3 + CO2 + H20 Li2CO3 is a water insoluble white precipitate The rest of the carbonates are water soluble solids
43
Describe the physical nature of the carbonates of group 1
Li2CO3 is a water insoluble white precipitate The rest of the carbonates are water soluble solids
44
Describe the physical nature of the carbonates of group 2
They are all water insoluble precipitates
45
Describe the decomposition of bicarbonates of group 2
Be(HCO3)2 ---> BeCO3 + CO2 + H20
46
Describe the physical nature of group 2 bicarbonates
They are aqueous solutions
47
Describe the decomposition of group 1 nitrates
LiNO3 --> Li2O + NO2 + O2 (reddish brown NO2 evolves) NaNO3 ---> NaNO2 + O2 KNO3 ---> KNO3 + O2 RbNO3 ---> RBNO3 + O2
48
Describe the decomposition of group 2 nitrates
Be(NO3)2 ---> BeO + NO2 + O2
49
What are s block elements?
elements which fill the last electron to a s-subshell
50
Give alternate names for group I and group II elements
Group I --> alkali metals Group II --> alkali earth metals
51
Metallic character of s block elements
H is a non-metal The rest are metals
52
common electronic configuration of group 1
ns1
53
Which group 1 elements do not reach a stable octet?
H and Li
54
Valency of group 1
always 1
55
Oxidation state of group 1
+1 and 0 (H can also have -1)
56
Natural resources containing group 1 metals
NaCl - rock salt Na2B4O7. 10.H2O ---> borax (primary standard substance) KCl - sylvite KCl. MgCl2. 6H2O - Carnallite
57
metallic character of group 11 elements
all are metals Be is an amphoteric metal
58
valency and oxidation no.
+2
59
natural sources containing group II elements
CaCO3 - calcite. limestone MgCO3 - magnesite CaCO3. MgCO3 - dolomite KCl. MgCl2. 6H2O - Carnallite CaSO4. 2H2O - Gypsum 3Ca3(PO4)2. CaF2 - Fluroapatite 3Ca3(PO4)2. CaCl2 - Chlorapatite
60
color of Li with flame test
Crimson red
61
color of Na with flame test
Yellow
62
color of K with flame test
Lilac / violet
63
color of Rb with flame test
Red-violet
64
color of Cs with flame test
Blue - violet
65
color of Mg with flame test
-
66
color of Be with flame test
-
67
color of Ca with flame test
orange red
68
color of Sr with flame test
crimson red
69
color of ba with flame test
yellowish green

Inorganic (9 decks)

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