Bonding and structure Flashcards
Define ionic bond
The strong electrostatic force of attraction between 2 oppositely charged ions
What is the trend in ionic radius down a group
Increases
Define isoelectronic ions
Ions of different atoms with the same number of electrons
What is the trend of isoelectronic ions
Decreases as the atomic number increases
What compounds do ionic compounds form
Giant ionic lattice
Why are giant ionic lattices formed
Because each ion is electrostatically attracted in all directions
How do ionic compounds behave in water
Ionic Compounds are soluable in water but not in non-polar solvents. This tells us that the particles are charged. The ions are pulled apart by polar molecules like water, but not by non-polar molecules.
What are the trends of ionic compounds in terms of conducting electricity.
Ionic compounds dont conduct electricity when they’re solid - but theydo when they’re moleten or dissolved. This supports the idea that there are ions fixed in position by strong ionic bonds in a solid, but are free to move and carry charge as a liquid or solution.
Are ionic compounds malleable, and if not why?
Ionic compounds are not malleable and cannot be shaped. This is because the ions would repel if they were attempted to be puller over eachother for example. The repulsion would be very strong so are brittle so they will break when they stretched or hammered. This supports the lattice model.
What happens when you electrolyse a green solution of copper (II) chromate (IV) on a piece of wet filter paper.
The filter papet turns blue at the cathode and yellow at the anode
What colour is copper (II) ions in solutions
Blue
What colour are chromate (IV) ions in solutions
Yellow
What colour is copper (II) chromate (VI) in solution
Green
Define covalent bonding
The strong electrostatic attraction between 2 positive nuclei and the shared electrons in the bond. A covalent bond is formed when two atoms share electrons.
