Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry > Halogens > Flashcards

Halogens Flashcards

You may prefer our related Brainscape-certified flashcards:
Chemistry 101 flashcards AP® Chemistry flashcards Periodic Table flashcards Organic Chemistry 101 flashcards
1
Q

What colour is F2 at room temp?

A

Yellow gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What colour is Cl2 at room temp?

A

Yellow-green gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What colour is Br2 at room temp?

A

Red-Brown Liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What colour is I2 at room temp?

A

Grey-black solid (violet/purple vapour heated)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is sol of Cl2 like in water?

A

Soluble forming a green/ col sol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is sol of Cl2 like in hexane?

A

Soluble forming a col sol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is sol of Br2 like in water?

A

Soluble forming yellow/orange/brown sol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is sol of Br2 like in hexane?

A

Soluble forming a red sol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is sol of I2 like in water?

A

Virtually insoluble- but any sol formed is yellow/brown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is sol of I2 like in hexane?

A

Soluble forming a violet/purple sol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is disproportionation?

A

Where one species oxidised and reduced in the same r

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

State the equ of NaOh in Cl- cold and dilute:

A

2NAOH+CL2-> NACL+NACLO+H20

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

State the equ of NaOh in Cl- HOT AND CONC:

A

3CL2+6NAOH-> 5NACL+ NACLO3+ 3H2O

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is formed in both r with NaOh sol?

A

Yellow and green gas dis to form colourless sol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Why does ox ability of halogens decrease down group?

A

B/c atomic no increases
Oxidising agent gains e and becomes reduced
Halogen atom gains e in outer en level to complete en level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Why is F2 easier oxidised than Cl2?

A

Completes en level closer to nucleus than e. than completes outer en level in CL2
E. that F2 gains has stronger attr to nucleus b/c closer to nucleus than for a Cl2 atom
E gained by F2 not subject to as much shielding by inner e. b/c fewer e between e gained and nucleus

17
Q

Why does the reducing ability of halides increase down group?

A

Increases as atomic number increases
Reducing agent loses e and becomes oxidised- donates e
Halide ions loses e from outer en level

18
Q

Why is I2 more readily reduced than Br2?

A

E. lost by I- ion comes from en level further from e than would be lost by Br- ion
E that I- ion loses has weaker attr to nucleus b/c further from nucl compared with other halide ions
E lost by I- ion is subj to greater shielding by inner e than other halide ions b/c more e between e lost and nucleus

19
Q

What are the obs of equ:
NaF + H2SO4-> NaHSO4 + HF

A

Misty fumes
Heat released
Gas produced
S dis.
Pungent smell (HF)

20
Q

What are the obs of equ:
NaCl + H2SO4-> NaHSO4 + HCl

A

Misty fumes (HCl)
Heat rel
Gas prod
S dis
Pungent smell (HCl)

21
Q

What are the obs for equs:
NaBr+H2SO4-> NaHSO4 + HBr
2HBr + H2SO4-> Br2+SO2+2H2O

A

Misty fumes (HBr)
Heat released
Gas produced
S dis
Red- brown vapour
Pungent smell (HBr/ SO2/ Br2)

22
Q

What are the obs of sodium iodide with sulfuric acid?

A

Misty fumes
Heat released
Gas produced’
S dis
Purple vapour and grey-black s (I2)
Pungent smell (HI, SO2, I2)
Rotten eggs smell (H2S)
Yellow s (S)

23
Q

How do you test for halide ion Cl-?

A

Test using glass rod dipped in conc NH3 sol- white smoke given off (HCl)

24
Q

How do you test for Br- ions?

A

Gives Br2 vapour with conc H2SO4 acid-> red-brown fumes

25
Q

How do you test for I- ions?

A

Iodide vapour w conc H2SO4-> purple fumes/ grey-black s formed

26
Q

What are the obs when halides react with phosphoric acid?

A

Misty fumes of hydr halides

27
Q

What do Cl2 and ozone both have in common (adv)?

A

Both kill microorg

28
Q

What is the adv of using Cl2?

A

Cheaper
Prov residual protection- still in water when reaches consumer
More soluble in water than ozone

29
Q

What are the disadv of using CL2?

A

Cannot kill some microorg
Leave chem in water
Unpleasant taste
Toxic to human -> v low quant needed

30
Q

What are the adv of ozone?

A

Kills more dif types of microorg than Cl2
Breakdown pr. is o2
No residual chem in water
Removes metals and organic particles from water
No unpleasant taste

31
Q

What is the disadv of ozone?

A

More exp
No residual prot against microorg
Less sol in water than Cl2 so req special mixing techniques

Chemistry (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions