SC5 - Ionic Bonding ✓ Flashcards Preview

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Flashcards in SC5 - Ionic Bonding ✓ Deck (9)
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1

SC5a - When ionically bonding, what happens to:

  • Metals
  • Non-metals

  • Metals loose an electron(s) as they are closer to 0/8 electrons in their outermost shell and so its easier to loose electrons
  • Non-metals are closer to 8/8 electrons in theri outermost shell and so it is easier for them to gain electrons

2

SC5a - What is the type of attraction in an ionic bond?

Electrostatic forces of attraction

3

SC5b - How do you work out the ionic formula of an atom and a compound?

  • An atom's ionic formula will depend on the numbe rof electrons in its outer shell.
  • If it has to loose electrons to gain a full outer shell, it will be positive by that much.
  • If it has to gain electrons it will be negative by that much.
  • In a compound, the charges of the ionic compound of an element need to cancel out.
  • e.g Mg 2+ and O 2+ will form MgO while Na+ and S2+ will form Na2S

4

SC5b - What is an ionic lattice structure?

When billons of ions are packed together in a regular structure.

5

SC5b - What are the main 5 polyatomic ions?

  • Ammonium, NH4+
  • Hydroxide, OH- 
  • Nitrate, NO3-
  • Carbonate, CO32-
  • Sulfate, SO42-

6

SC5c - Are the melting and boiling points of Ionic compounds high/low and why?

They are high as they have strong electrostatic forces of attraction which require a lot of energy to overcome and break

7

SC5c - Are ionic compounds electrically conductive and why/why not?

For a substance to be conductive it must contain particles that are:

  1. Charged 
  2. Free to move

So Ionic compounds can conduct electricity when they are aqueous or molten.

8

SC5a - What is a cation and an anion?

  • Cation: A positively charged ion (A metal which has lost an electron) Anion
  • A negatively charged ion (A non-metal which has gained an electron)

CAT-ions are PAWS-ative (Thank you Mr. Moore #gonebutnotforgotten)

9

SC5c - How does an aqueous ionic compound conduct electricity?

The negative ions flow to the anode(+) and the positive ions flow to the cathode(-). electrons do not flow.