Naming Ionic Compounds 🔗
- Ions can join together to form compounds.
- They join in such a way that their charges cancel out and the resulting compound is neutral (we will practise this later).
- To name an ionic compound:
- Identify the two ions that make up the compound
- Write the name of each ion in that same order
- Hint: The positive ion (metal) will always come first
- Hint 2: It is important to include the (II) or (III) if it is part of the ion name.
Whakawai 🔗
- $CaCO_{3}$
- $Ca^{2+}$ and $CO_{3}^{2-}$ ions $\rightarrow$ Calcium Carbonate
- $MgSO_{4}$
- Magnesium Sulfate
- $Fe(OH)_{2}$
- Iron (II) Hydroxide
- $Fe(OH)_{3}$
- Iron (III) Hydroxide
More Whakawai 🔗
- Collect a sheet from the front.
- This sheet includes every variation of ionic compounds that you should see this year!
- Answer 20 today, but you should be able to do all of them before we have a test.
Forming Ionic Compounds 🔗
When Ions Have Equal Charges 🔗
- Some ionic formulae are easy to generate
- This occurs when they have equal and opposite charges. E.g.
- Potassium Chloride: $K^{+}$ and $Cl^{-1}$.
- Simply remove the charges and join them together: $KCl$.
- Magnesium Sulfate: $Mg^{2+} + SO_{4}^{2-} \rightarrow MgSO_{4}$
- Notice how the charge is removed, but we keep it $O_{4}$! That is because the 4 tells us how many oxygen atoms there is!
Whakawai / Practise 🔗
Make these simple ionic compounds:
- Hydrogen Chloride
- Calcium Sulfide
- Aluminium Phosphate
- Ammonium Hydrogen Carbonate
- Potassium Hydroxide
- Iron (II) Oxide
- Zinc Sulphate
- Iron (III) Nitride
Akoranga 13 Mahi Tuatahi 🔗
Form these simple ionic compounds:
- Copper Sulfate
- Sodium Nitrate
- Potassium Chloride
- Aluminium Nitride
- Iron (III) Phosphate
Te Whāinga Ako 🔗
- Be able to form complicated ions using swap-and-drop
Write the date and te whāinga ako in your book
When the Charges are Unequal 🔗
Swap and Drop!
- Remove the sign from the charges (+/-)
- Swap the numbers between the ions
- Drop them down to the bottom
| Lithium Oxide | Aluminium Hydroxide | Ammonium Sulphate | |
|---|---|---|---|
| Charges | |||
| Swap | |||
| Drop | |||
| Compound |
Whakawai / Practise 🔗
Make these more complicated ionic compounds:
- Hydrogen Sulphate
- Lithium Oxide
- Calcium Carbonate
- Lead Phosphate
- Lead Nitride
- Lead Nitrate
Task/Ngohe 🔗
- Education Perfect on Ions and Compounds
- Make notes in your book of any new information you find that you think you should know!