Electromagnetic Radiation And Atomic Spectra Flashcards
How many meters are in 1nm?
10^-9m
What is a photon?
Particles with a fixed quantity of EM radiation
What is a dative covalent bond?
Both electrons in the covalent bond are donated by one of the atoms.
Describe why many transition metals complexes are coloured.
Absorption of visible light causes electrons to move from low energy d orbitals to higher energy d orbitals. The TM complex colour is the complementary colour of the colour that has been absorbed.
What is an indicator?
A weak acid that has a colour gor the weak acid and a different colour for conjugate base used in acid-base titrations.
Indicator for pH of equilibrium point 7
Bromothymol blue
// for pH 5
Methyl red
// pH 9
Phenolpthalein
Choosing an indicator for a weak/weak titration
Too gradual to detect, N/A
When is the colour change of an indicator assumed to be distinguishable?
When these differ by a factor of 10.
What is the units of k when the order of the reaction is 0
Mol l-1 s-1
What is the units of k when the order of the reaction is 1
S-1
What is the units of k when the order of the reaction is 2
L mol-1 s-1
What is the units of k when the order of the reaction is 3
L2 mol-2 s-1
What is meant by „accurately weigh approximately“?
The accurate mass must be recorded but it does not need to be the exact amount.
How is the filter in colorimetry chosen?
Filter is the complementary colour to the colour of solution.
How would you prepare a series of standard solutions to be used in colorimetry?
Use a standard stock solution and accurately measure the required volume into a standard flask. Make to mark with solvent (usually distilled water). Repeat to make series of dilutions.
