1. Quiz on the halogens

2. Using the quiz …
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3. 1. Which group of the Periodic Table are the halogens in ?
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4. 2. Fluorine is the first halogen in the Periodic Table
2. Fluorine is the first halogen in the Periodic Table. Name the next three in the group
Chlorine
Bromine
Iodine
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5. 3. What colour is chlorine gas?
Yellow / green
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6. 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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7. 5. What colour is bromine liquid?
red
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8. 6. The boiling point of chlorine is -34oC
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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9. 7. How many electrons do all halogens have in their outer shell ?
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10. 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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11. Fluorine is the most reactive halogen
9. Which is more reactive : fluorine (atomic number 9 ) or chlorine ( atomic number 17) ?
Fluorine is the most reactive halogen
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12. 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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13. 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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14. 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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15. That was the last question. I hope you got all the answers correct !
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