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level: Level 1 of Chapter 12

Questions and Answers List

level questions: Level 1 of Chapter 12

Question	Answer
Chlorine undergoes disproportion in water:	Cl₂(aq) + H₂O(1) → HCL(aq) + HCLO(aq)
Chlorine undergoes disproportion in water:	Cl₂(aq) + H₂O(1) → HCL(aq) + HCLO(aq)
Chlorine undergoes disproportion in water:	Cl₂(aq) + H₂O(1) → HCL(aq) + HCLO(aq)
Group 17 of the Periodic Table is also known as....	halogens
What is the electron configuration of fluorine (F)	1s² 2s² 2p⁵
What is the electron configuration of chlorine (Cl)	1s² 2s² 2p⁶ 3s² 3p⁵
What is the electron configuration of bromine (Br)	1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵
What is the electron configuration of Iodine (I)	1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁵
Group 17 elements are all ........... At room temperature, they exist as ......... molecules. There are ......... bond between the 2 atoms in each molecule	Non-metals Diatomic molecules single covalent bond
Melting and boiling points of the halogens (increase / decrease ) going down the group.	Increase
The boiling point data gives us an idea of the ........... of halogens	volatility
There are only weak van der Waals' forces between their diatomic molecule, caused by ..... . These forces increase as the ..........in the molecules increases with increasing atomic number	Caused by instaneous dipole-induced dipole forces
The colours of halogens get (lighter/ darker ) going down the group?	Darker
Halogens need to what, to achieve the stable electronic configuration of a noble gas atoms to the right of them in the Periodic Table	Halogens atoms need to gain just one more electron
Why are halogen elements oxidising agents	When a halogen reacts with a metal atom, the halogen atom gains one electron
Halogens get (more/less) reactive going down Group 17	less
What is electronegativity	Electronegativity is the ability of a covalent bonded atom to attract the bonding pair of electrons towards itself
A more reactive halogen can displace a ........ halogen from a .......of the less reactive halogen	Less reactive halogen halide solution
Does the oxidising power of the halogens decrease or increase going down Group 17	Decreases
How are hydrogen halides form	The halogens form hydrogen halides when combined with hydrogen gas
Are hydrogen halides more or less thermally stable going down Group 17	Less
Bond energies decrease or increase going down Group 17	decrease
Does a longer bond require more energy to break or not	No
Element chlorine undergoes a type of redox reaction called ............ when it reacts with alkali. What is a simple explanation of this?	Disproportionation Self-reduction / oxidation' reaction
Why do we add chloride to water	By adding a small amount of chlorine to a water supply will kill bacteria and make the water safer to drink
Chlorine undergoes disproportion in water:	Cl₂(aq) + H₂O(1) → HCL(aq) + HCLO(aq)