4.2 Group 7 Elements
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give the name for group 7
halogens
true or false: halogens are diatomic molecules
true
colour change of I2 + and KBr (+give dispalcement)
No change (stays brown) [1] because Br is more reactive than I [2]
colour change of I2 + and KCl (+give dispalcement)
No change (stays brown) [1] because Cl is more reactive than I [2]
color change of Br2 + KI (+give displacement)
Yellow –> brown [1] Bromine displaces iodine [2]
colour change of Br2 + KCl (+ give displacement)
no change (stays yellow) [1] because Cl is more reactive than Br
colour change of Cl2 + KI (+give displacement)
colourless –> brown [1] because Cl displaces iodine [2]
colour change of Cl2 + KBr (+ give displacement)
Colourless –> yellow [1] because Cl displaces Br [2]
what colour does phlenolphthalein go in HCl (aq)
colourless
what colour does methyl orange go in HCl (aq)
red
what colour does damp blue litmus paper go in HCl (aq)
red
what colour does damp red litmus paper go in HCl (aq)
stays red
what colour does dry blue litmus paper go in HCl (aq)
red
what colour does dry litmus paper go in HCl (aq)
stays red
what colour does universal indicator go in HCl (aq)
red
what colour does phlenolphalein go in HCl (aq)
stays colourless
what colour does methyl orange go when HCl (g) is added
yellow
what colour does damp blue litmus paper go when HCl (g) is added
red
what colour does damp red litmus paper go when HCl (g) is added
stays red
what colour does dry blue litmus paper go when HCl (g) is added
stays blue
what colour does unviersal indicator paper go when HCl (g) is added
green
what is the pH of HCl (g)
7
why is it inadvisable to use pure liquid bromine
because it is highly toxic and corrosive
in the equation 2KBr + Cl2 –> 2KCl + Br which ion or molecule has been reduced
Cl2 molecule, because it gains an electron