WorksheetsOCR Chemistry A - 'The Halogens' 3.1.3
Total questions: 17
Worksheet time: 11mins
How do the halogens exist in their standard state?
as monoatomic molecules
as diatomic molecules
as a giant covalent lattice
From fluorine to iodine, the boiling points of the halogens
decrease down the group BECAUSE fluorine is the most reactive halogen
decrease down the group BECAUSE fluorine is the most electronegative halogen
increase down the group BECAUSE iodine has the most electrons
increases down the group BECAUSE iodine has the largest atomic radius
What is the electronic configuration of Chlorine? Written in the form 1s2 2s2 2...
(a)
How many electrons does a halogen have in its outer shell and what charge ion does it form?
2, +2
6, -2
7, -1
1, +1
What intermolecular forces are present for halogen molecules?
permanent dipole-dipole
hydrogen bonding
induced dipole-dipole
ionic
In a halogen-halide displacement reaction ________ can replace ____________. Tick all that apply
iodine, bromide
bromine, iodide
bromine, chloride
chlorine, bromide
chlorine, iodide
Down the group reactivity of the halogens (a) ?
In a redox reaction is chlorine, Cl2, oxidised or reduced?
(a)
When Cl2(aq) reacts with iodide ions (aq) what is observed?
colour change to pale green from Cl2 (aq) formation
no change observed
colour change to orange from Br2 (aq) formation
colour change to violet from I2 (aq) formation
Fill in the blanks:
In the halogens, going down the group, atomic radius _________. More inner shells causes shielding to __________. ____ nuclear attraction to capture an electron from another species. Reactivity ___________.
decreases, decrease, more, increases
increases, decrease, less, increases
increases, increase, less, decreases
decreases, increase, more, decreases
Which of the following are examples of a disproportionate reaction
Cl2(aq) + H2O(l) --> HClO(aq) + HCl(aq)
Cl2(aq) + 2Na(s) --> 2NaCl(aq)
Cl2(aq) + 2NaOH(s) --> NaClO(aq) + NaCl(aq) + H2O(l)
Cl2(aq) + 2Br-(aq) --> 2Cl-(aq) + Br2(aq)
What are the disadvantages of using chlorine in water treatment?
formation of organic hydrocarbons that can decay vegetation
chlorine gas is toxic
formation of chlorinated hydrocarbons which are carcinogens
chlorine is a respiratory irritant
formation of toxic salts
Which aqueous metal ion do aqueous halide ions react with to form precipitates
Ag+(aq)
Au+(aq)
Hg+(aq)
Pb+(aq)
What is the best explanation for the trend in boiling points down the halogens group?
The covalent bonds become stronger
The hydrogen bonds become stronger
The permanent dipole-dipole interactions become stronger
The induced dipole-dipole interactions (London forces) increase
Which silver compound is insoluble in conentrated NH3(aq)?
AgNO3
AgCl
AgBr
AgI
Which statement about the reactions of halogens with halide ions is correct?
A
B
C
D
Which reaction shows chlorine only being oxidised
A
B
C
D
