C3e Halogens (Mf Es Attempt)

1,057 views
999 views

Published on

Published in: Education, Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,057
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
29
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

C3e Halogens (Mf Es Attempt)

  1. 1. C3e Group 7 – The Halogens • Group 7 elements are known as the ______________________. • They include: • Physical appearances at room temperature: Halogen Formula Colour and Physical State Use • Chlorine • Bromine Iodine • What physical appearance would you predict for: Fluorine – Astatine (As) - Sodium Chloride, NaCl
  2. 2. A very common compound of chlorine is sodium chloride. You need to learn it’s formula, __________, and 3 important uses: 1. 2. 3. Chemical Reactions of the halogens The Reaction of the halogens with alkali metals: The halogens react _______________ with the alkali metals e.g. sodium + chlorine sodium chloride 2Na Cl2 2NaCl sodium + bromine sodium + iodine Fluorine and Astatine are also in group 7; can you predict how they would react with sodium? Displacement Reactions
  3. 3. The reaction of potassium bromide with chlorine is an example of a _____________ reaction: Potassium bromide + chlorine bromine + potassium chloride • We call this a _______________ reaction because bromine has been displaced and replaced by ______________ • This happens because chlorine is ___________ reactive than bromine • A less reactive halogen cannot displace one which is _______ reactive Investigating Displacement Reactions The halogens can be placed in order of reactivity by investigating these displacement reactions. You will now carry out this investigation and record the results in the table below: Analysis Write word and symbol equations for the successful displacement reactions:
  4. 4. Conclusion • The halogen which displaced the most was ______________ • The halogen which displaced the least was ______________ • The most reactive halogen tested was _____________ and the least reactive was _______________ • The halogens get ___________ reactive down the group Using this information, put a tick or a cross if your think that there would be displacement in the following situations: Potassium iodide + fluorine Potassium chloride + fluorine Potassium fluoride + chlorine Potassium bromide + astatine (At) Electronic Structure of the Halogens The halogens all react in a similar way because of the similarities in their electronic structure: • The chlorine, bromine and iodine are all in group ___ so they have ___ electrons in their outer shell • To achieve a full outer shell they need to _______ an electron from a __________ atom and become a _____________ ion
  5. 5. Complete the following table: Halogen Atom Electron structure Ion Electron structure Fluorine F 2,7 F- 2,8 Chlorine Cl Cl- Bromine Br 2,8,18,7 Br- Reduction (Remember OIL RIG) • When atoms gain an electron to become ____________ ions we say they have been _____________ e.g. Chlorine- Cl2 + 2e- 2Cl- Bromine- Br + Iodine-

×