Past Papers Flashcards
What many elements bind to a octahedral complex ion
6
How many bonds does a bidentate ligand has
2
What technique does purify and identify a compound
Distillation
The absorption of radiation in the radio frequency region causes H nuclei to adopt a high frequency state aligned against a strong magnetic field.
Explain how this leads to peaks in an NMR spectrum corresponding to the different H environments
Hydrogen nuclei flip with magnetic field
Different wavelengths
OR
Different energy gaps between high and low states
State a reason why different bonds absorb different wave numbers of infrared radiation
Different strengths of bonds
State what is meant by a weak acid
Partially disassociated into ions in an aqueous solution
The sodium salt of Heuke acid formed a new reaction mixture during the first step is treated with dilute hydrochloric acid. A white precipitate of puke acid is formed.
Explain why adding hydrogen ions in the salt of the weak acid results in the formation of undisassociated weak acid molecules
Hydrogen ions react with the conjugate base
What causes d orbital splitting in octahedral complex 
Repulsion from Electrons
State the aufbau principal
Electrons fill orbitals in order of increasing energy
State one difference between bonding molecular orbital and an anti-bonding molecular orbital 
Anti-bonding high energy or anti-bonding unfilled and bonding filled 
Explain why cis and trans isomerism can exist in some compounds with carbon to carbon double bonds 
Lack of rotation at the double bond
Two different groups attached to each carbon atom
Describe fully how weighing by difference Work
Weigh the empty container
weigh the container with the sample 
State what is meant by nucleophilic
Negatively charged ions or neutral molecules that are electron rich
What is meant by an antagonist?
Binds to receptor and prevents the response
Sate second law of thermodynamics
The entropy of a reaction system and its surroundings increases for a spontaneous process
