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C- First 2 > Group 2 > Flashcards

Group 2 Flashcards

1
Q

Colour of Li flame test??

A

Red!! (Li - Lipstick)

❤️💋💄❤️💋💄

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2
Q

Flame test for K colour??

A

Purple (LilaK)

💜💜💜

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3
Q

Flame test colour for Mg?

A

Colourless!! (Magic Mg)

✨✨✨

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4
Q

Flame test colour for Sr??

A

Red!! (Sr RRR red)

❤️❤️❤️

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5
Q

Flame test colour for Na??

A

Yellow!! 💛☀️💛☀️

Sodium sunshine yellow

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6
Q

Flame test colour for Cs??

A

Blue 🌊💙🌊💙

Sea is blue Caesium

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7
Q

Flame test colour for Ba??

A

Green 🍏💚🐑💚

Baaaaa green grass

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8
Q

Flame test colour for Ca?

A

Red ❤️💉❤️

Ca in bones surrounded by RED blood

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9
Q

How to do a flame test??

A 
Nichrome wire (can us Pt. but £££) inert metals!!
💜💛💚💙

c.HCl (dipped and cleaned)
💜💛💚💙

Non-luminous flame
💜💛💚💙

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10
Q

Trend of ionisation energy down group 2??

A

Decreases!

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11
Q

Explain the trend of ionisation energy down group 2?

A

Bigger atoms,
More shielding,
Easier to remove putter electrons,
Further from the +ve nucleus

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12
Q

The trend in solubility of sulfates down group 2??

A

Decreases!!!

aq
|
V
(s) e.g. BaSO4 (very insoluble barium meal used in veterinary!)

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13
Q

Trend in solubility of hydroxides down group 2??

A 
Solubility increased!! 
Down group (s) >> (aq)
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14
Q

Solubility of SO4 ________ and solubility of OH _______ down group 2??

A

SO4 decreases!!! (BaSO4)

OH increases (they are opposites)

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15
Q

Trend in thermal stability down group 2??

A

Thermal stability increases down group 2!!!

The test tube melted!!

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16
Q

Why does thermal stability increase down group 2???

A

Be/Mg are stronger cations than Ba/Sr….. (They are smaller bigger nuclear attraction) This makes them more polarising to the anion!

A stretched elastic band is easier to break than a relaxed band !!

17
Q

Explanation for how colours are produced in a flame test??

A

Heat energy absorbed from the flame excites electrons to higher energy levels - as e-s fall to lower energy levels energy is emitted in the visible light spectrum - we see colours!!!

18
Q

How easily nitrates decompose can be tested by measuring ??? (2)

A

1) how long it takes until oxygen is produced (to relight a glowing splint)
✨✨✨✨
OR…
2) how long until brown gas (NO2) is produced. This needs to be done in a fine cupboard - NO2 is toxic !!!

19
Q

How easily carbonates decompose can be tested my measuring???

A

How long it takes for carbon dioxide to be produced.

Test with lime water - which is saturated sol. CaOH. Turns cloudy with CO2!!

20
Q

Group 2, nitrates decompose to form……

A

Oxygen + nitrogen dioxide + oxide !!

2M(NO3)2 (s). &raquo_space; 2MO (s). + 4NO2 (g) + O2 (g)

21
Q

Group 2 carbonates decompose to form….??

A

The oxide and Carbon Dioxide!!

MCO3 (s). &raquo_space;> MO (s) + CO2 (g)

22
Q

Group 1 ONE 1!!!!!

Trend of thermal stability of carbonates???

A

They are thermally stable - you can’t heat them enough with Bunsen burner to decompose them!!!

(Except Li2CO3)
Li2O and CO2

23
Q

All group 1 carbonates are thermal stable except which element???

A

Li!!!! Li2CO3

To form Li2O and CO2

24
Q

Group 1 ONE 1!!!

Nitrates decompose to form??

A

Nitrite and oxygen!!!!

2MNO3 (s) &raquo_space;> 2MNO2 (s) + O2(g)

✨✨✨expect Li!!!
LiNO3 > Li2O, NO2, O2

25
Q

Group 1 thermal stability compared to Group 2 thermal stability???

A

Group 2 are LESS thermally stable than group 1!!
✨✨✨
Greater the charge on the cation, the greater the distortion and the less stable the carbonate/nitrate ion. Group 2 have 2+ compared to 1+ charge of group 1 cations!!

26
Q

Thermal stability increases down groups 1 and 2….why??

A

Carbonates and nitrates are large anions and can be made unstable by the presence of a +ve charged ion.
✨✨✨
The cation polarises the anion, distorting it!
✨✨✨
The greatest the distortion the more unstable the anion.
✨✨✨
Larger cations cause less distortion than smaller cations.
✨✨✨
Down the group cation size increases!!!

27
Q

Thermal decomposition = ?

A

When a substance breaks down when heated!!!

Don’t add any extra oxygen into your equations!!! Just a heated arrow 💁

C- First 2 (3 decks)

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