Transcript halogens - kreducate

Quiz on the halogens
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1. Which group of the
Periodic Table are the
halogens in ?
Group 7
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2. Fluorine is the first
halogen in the Periodic
Table. Name the next three
in the group
Chlorine
Bromine
Iodine
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3. What colour is chlorine
gas?
Yellow / green
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4. Which halogen is purple ?
iodine ( though the solid can look
more grey than purple; the solution
and gas are distinctly purple)
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5. What colour is bromine
liquid?
red
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6. The boiling point of
chlorine is -34oC. What state
is it in a room temperature?
- and explain your answer
It is a gas. Room temperature is
above its boiling point, so if you
imagine heating it up from a very
low temperature, it boils (ie turns
into a gas) before it reaches room
temperature
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7. How many electrons do all
halogens have in their outer
shell ?
7
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8. Explain why halogens react
violently with Group 1 elements
Each halogen atom needs one electron
to complete its outer shell. Each Group 1
atom needs to get rid of one electron to
complete its outer shell : a perfect
match!
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9. Which is more reactive :
fluorine (atomic number 9 )
or chlorine ( atomic number
17) ?
Fluorine is the most
reactive halogen
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10. What - if anything happens when you mix
chlorine water with sodium
bromide solution ?
The yellow colour of the chlorine water is
replaced by a red/brown colour. You now
have bromine water and sodium chloride
solution
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11. What - if anything happens when you mix
iodine water with sodium
bromide solution ?
Nothing happens because the iodine is less
reactive so it does not displace the
bromine from the sodium bromide
compound
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12. Explain why fluorine is
the most reactive of the
halogens
There is only one complete inner
shell and this does not provide
much shielding of the positive
charge on the nucleus. This means
there is a strong attraction for an
electron to join the atom
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