#Question
1How many grains of sand are there in the world? 
2A container with liquid nitrogen is left in a laboratory, and its temperature is being recorded over a long period. The recorded temperature shows variations. Why? 
3Why don’t fish freeze? 
4Write down an organic reaction you have studied at school and explain its mechanism. 
5Explain the bonding in benzene. 
6Why does the boiling point of water rise as salt is dissolved in it? 
7Why do you think chemistry will change your life and the life of those around you? 
8How would you measure pH of a solution if I told you how many hydrogen ions there were in it? 
9How many molecules there were in the glass of water on the table? 
10What is ‘turning you on’ in chemistry at the moment? 
11Derive a Henderson equation. 
12Tell me about your life, from the beginning to what made you sit in that chair 
13Tell me about these eggs? 
14How does a glow-stick work? 
15How would you measure pH if I told you how many hydrogen ions there were? 
16What makes some chemicals explosive? 
17How many atoms are there in a brussel sprout? 
18Why is life X enantiomer-based rather than Y? 
19What is the concentration of water? 
20Why is there salt in the sea?
21Shown a block of iron. Asked to name it, explain why it rusts, how to stop it rusting.
22Explain the bonding in benzene.
23What makes drugs physiologically active?
24Why does the boiling point of water rise as salt is dissolved in it?
25Visualisation of 3D molecular models when given a molecular formula. In addition, rotation, and symmetry of 3D models.
26How many molecules there were in the glass of water on the table?  Comments
27Last bit was on a Pressure/Volume phase diagram, included in the IB syllabus but not on the A-Level so I found this quite easy without the interviewers knowing how. Had to discuss the triple point, which area was which phase and some of the unique properties of water linked to this.
28Then they threw a periodic table with only 6 periods at me. Had to draw some Lewis structures of various molecules, speculate that the element with three valence electrons would be the basis for life in this universe and then deduced that life would then be flat - formation of triganol planar molecules rather than tetrahedral.
29They asked me what I'd been doing recently [in chemistry] (ie what do you want to talk about). I said looking at links between physical and organic - using kinetics to determine mechanisms etc. They rather liked equilibria - so I had to come up with an organic equilibrium - esterfication. Had to draw its mechanism and the hydrolsis mechanism. Found this quite hard becuase I did IB which has very little organic chemistry.
30I was questioned about NaCl, we spoke about the lattice, why it has a high melting point, why its so strong etc
31I was presented with a blank graph, I was told to sketch the curve of this equation (V(r) = A/r^12 – B/r^6)) and then to interpret the graph and differentiate the equation and label minimum points
32I was questioned about rates of reactions
33I was questioned about nucleophillic substitution and told to draw out mechanisms and label them, and then I had to build up on it and compare why certain molecules was a better nucleophile then the other
34He asked me about alcohols, aldehydes and ketones and the way in which they can be distinguished between each other both chemically and physically
35Write some oxidation of alcohols equations down on a piece of paper
36There are 3 doors in a line and behind one of the doors is a sports car which you can win. Initially you go and stand behind the middle door and choose it. At this point someone opens the left hand door and you see that there is no car behind it. To maximise your chance of winning the car do you stay behind the middle door and choose it or do you move to the door to the right and choose that?
37About shapes of molecules. Firstly NH3, then BH3, then NH3BH3, then N3B3H6.
38I was asked to draw the mechanism of bromination of cyclohexene, and about geometrical and optical isomers of that molecule. 
39I was asked to determine the number of water molecules in a given cup of 180ml, stating my assumptions (temperature & pressure, dissociation, ions, relative mass of O=16, H=1 etc.). 
40I was given an equation and told to draw it, with it ending up being the equation for an energy curve relating to internuclear separation. I was then asked to differentiate and suggest what the curve would look like for different diatomic elements.
41Does it take longer for an egg to boil up a mountain?
42They asked about IR and UV waves and the greenhouse effect.
43They asked how many molecules in a glass of water qu
44Had to draw phosphoric acid in inorganic
45Questions about cis-trans and optical isomers
46Question about a mass on a spring and if you took a picture where was it most likely to be in relation to x (a line that he drew) 
47Why the value of E(cell) can vary
48Drawing graphs of reversible reactions
49Kinetic theory of reaction and the Arrhenius equation/graphs. 
50How large a balloon would I need to hold 13.2 Tonnes of Carbon Dioxide? (Volume + radius)
51Write out the equation for the complete combustion of graphite.
52Draw an energy-diagram and explain where the reaction is endo- or exothermic. Thus, deduce whether it is the reactants or the products that are most stable.
53Explain activation energy.
54Can a reaction have no activation energy?
55Suggest a reaction with no activation energy and explain why it doesn’t have one.
56Draw a graph of the potential energy change as the two atoms approach one another. Add to the same axes a graph to show kinetic energy change as the two atoms approach each other. From these graphs, explain why the atoms will never react in these circumstances. Suggest a method of making the atoms react.
57Select your favourite organic mechanism and we’ll talk about it.
58Explain the carbon-double-bond-oxygen in terms of two bonds (ie, pi and sigma bonds).
59React an acyl chloride with ammonia. What would I get if I reacted one with a carboxylic acid? What would I get if I reacted one with an alcohol? What would I get if I reacted one with an ester?
60Draw oxygen, simply, as it exists in the air.
61How many ‘outer’ electrons does oxygen have and in which orbitals do they appear?
62How do electrons exist?
63Which two forms can they take?
64If they act like a wave, what would happen with the following: (He proceeded to draw a sin-curve, and labelled it amplitude. He then drew another, identical curve, beneath it. He labelled the curve, when above the axes, with a plus and with a ‘minus-sign’ when below the axes.) If two electrons act like this, next to eachother, what type of interference occurs?
65How might this interference affect bonding? (He then drew another pair of axes, this time with two different sin-curves, where they were reflections of eachother in the x-axis).
66Draw the energy levels for the orbitals in oxygen and fill them in, with the electrons available to two bonding atoms. Thus, deduce why oxygen has a double bond.
67The graph of sin(x)/x
68Estimate the mass of a sugar lump
69Electron counting 
70Le Chatelier’s principle
71Shearing in crystals
72About chirality, what is it, examples, chirality in biological systems, differentiating between enantiomers
73Aldehydes/ketones, test to distinguish, mechanism of oxidation, where does the oxygen come from when aldehyde is oxidised
74Trnsition metals - why their coloured and then talked about why are things coloured in general,
75Chemical industry related questions covering electrolysis, The Bosch Haber process and Hall Herlout process
76General nucleophiles and electrophiles and deciding which species is which
77Mechanisms - various
78Acidicity and use of the PH = -log[H+] equation for water (knowing PH of water is 7)
79Balancing half-equations involving iodine
80Molecule attraction and repulsion (the fact that molecules will attract to a certain extent and will then repel). Graph sketching for this (like a bucket-graph).
81If I’ve got an alkane and I’d like to know more about it, what should I do?
82Draw and explain the mechanism of ethene’s polymerisation
83How and why are the structure for CO2 and SiO2 different?
84Why are some objects opaque and some transparant?
85Explain the trend in ionisation potentials as you go across a period.
86What metals play an important role in Biology?
87The mechanism for esterification between a carboxylic acid and an alcohol…
88Asked about the ideal gas equation
89Work through some basic equations and scetch a graph of V=(A/r^12)-(B/r^6). 
90Acid strength
91The shape of complex ions and why this occurs, as well as colour formation in complex ions
92Chiral carbons and organic mechanisms
93Find the number of H+ ions in 1ml of water