Past Paper Questions Flashcards
What colour is [Mn(H2O)6]2+ ?
Pink
What colour is [Ni(H2O)6]2+
Green
What colour is [Co(H2O)6]2+
Pink
What colour is [V(H2O)6]3+?
Green
What colour is [Ni(NH3)6]2+?
Blue
Define the term ligand.
An ion or molecule with a lone pair of electrons which forms a co-ordinate bond with a metal atom or ion in a complex.
Why does the co-ordination number change when hexaaquacopper(II) ions react with conc. hydrochloric acid?
The chloride ion is bigger than the water ion.
Define Standard Electrode Potential
Potential difference when a half-cell is connected to a hydrogen electrode under standard conditions.
Why do azo dyes have colours?
The extensive delocalisation of electrons brings the energy levels closer together. This causes the dye to absorb some of the visible light so the dye becomes coloured as it removed from the light.
What is a α-amino acid?
An acid where the amine group and carboxylic acid group are attached to the same carbon atom.
What makes something optically active?
It contains a carbon atom with four different groups directly bonded to the carbon atom.
Name a chemical used to make a salt bridge.
Potassium Chloride
How do you make a salt bridge from paper in a laboratory?
Soak a strip of filter paper in a solution of potassium chloride.
Name two reasons for using a salt bridge in an electrochemical cell.
To complete the circuit.
Maintain the bala d por anions and cations.
What is meant by the term condensation polymer?
Polymers formed by the elimination of small molecules such as water or hydrogen chloride when monomers join together.
