Chemistry Is Weird, Brain Chemistry Is Weirder: Part One

Despite the fact that most of us were exposed to the subject in high school, I’d wager that 99.99% of us don’t give a passing moments thought to the reality in our world, the reality which makes you, you – chemistry. Yet, even if you did chemistry in high school, you probably never gave a passing moments thought to how weird chemistry really is. Weirdness aside, chemistry works. We all rely on that, except when it comes to the chemistry that rules the roost of that brain thingy of yours.

Chemistry is really weird if you stop and think about it. The basics from the ground up, those fundamental constituents, protons, neutrons and electrons, have the properties of charge, mass and spin and presumably exist in a solid state at STP (standard temperature and pressure) or at any other temperature and pressure. In other words, they have none of the general properties, apart from mass, associated with any of the general properties associated with the chemical elements.

Given those elementary particles, if you start to pile them up, well charge plus charge equals a greater or lesser overall charge; mass plus mass equals more mass; spin plus spin – well I’m not sure spin is a property that can be added or subtracted.

If it could be so arranged, but we’ll make it so since this is a thought experiment, a baseball-sized collection of electrons or neutrons or protons at STP would obviously have mass, and a lot of electric charge in the case of protons and electrons. But what would the colour be? What would it taste like? What would it smell like? What would it feel like? These are unanswered and probably unanswerable questions. However, I get the impression that somehow a proton (for example) isn’t sweet or salty; red or green; rubbery or hard like steel. I’ve oft wondered what a spoonful of neutrons would taste like – presumably they wouldn’t poison you.

But assemble these fundamentals in various combinations and all of a sudden you do get all of the chemical elements with their associated colours and tastes and so on. That’s a bit weird for starters.

How many atoms of gold (for example but any other element would do) have to come together or be assembled before you have the properties of gold? It surely has to be more than one atom worth surely. Is one atom of gold a solid, liquid or gas? Surely an atom of gold has properties greater than the sum of its individual electron, neutron and proton constituents.

But even weirder is when you start to combine the various elements with associated properties into molecules that have properties totally unlike the parent elements. You have hydrogen and oxygen as dry gases at STP that make water which is wet and liquid at STP. Silicon is a solid at STP and Carbon is a solid at STP, and Oxygen is a gas at STP, but Carbon Dioxide is a gas at STP whereas Silicon Dioxide (sand) is a solid at STP, yet Carbon and Silicon are like mother and daughter in terms of similarity. Then you have Chlorine, a poisonous yellow gas at STP, and Sodium, which is a solid shiny metal at STP, and volatile enough such that if you swallow any you will really do yourself a very serious mischief. However, Sodium Chloride is just pure table salt and a compound your body requires to survive and thrive!

Carbon isn’t a poison even though you wouldn’t live very long on just a diet of diamonds or coal, pure Oxygen you can breathe, but you’d die in a pure Carbon Dioxide environment, or even in a pure Carbon Monoxide environment. Neither Carbon Dioxide nor Carbon Monoxide is very nutritious, although both Carbon and Oxygen form the chemical backbone of many, probably all foods.

All of chemistry is deterministic and predictable, both inorganic and organic, with the apparent exception of brain chemistry, which I’ll get to shortly.

You’d think chemistry would be straightforward, but chemistry can act in rather weird, even unpredictable ways. I mean, if you have an atom of Sodium and an atom of Chlorine, you get a straight-forward molecule of table salt (salty - although the question needs asking, how many molecules do you need before you get the property of saltiness). If you have two atoms of Hydrogen and one atom of Oxygen you get, in a straightforward fashion, a molecule of water at STP (wet – although the question needs asking, how many molecules do you need before you get the property of wetness). Combine Carbon, Oxygen and Hydrogen in a certain way and you get sugar (sweet – although the question needs asking, how many molecules do you collectively need before you get the property of wetness). Another arrangement can give you chlorophyll (green – although the question needs asking, how many molecules do you need before you get the property of greenness).

Now how is this weird? Well, the basic constituents, protons, electrons and neutrons aren’t salty, wet, sweet or green. Sodium and Chlorine atoms aren’t salty; table salt is salty. Oxygen and Hydrogen atoms aren’t wet at STP; water is wet at STP. Carbon, Oxygen and Hydrogen atoms aren’t sweet; sugar is sweet. The constituent atoms comprising the chlorophyll molecule (Carbon, Oxygen, Hydrogen, Nitrogen and Magnesium) aren’t green; chlorophyll is green.

So how do the properties of saltiness, wetness, sweetness, greenness, arise from those constituents that don’t have those properties? It’s not quite as strange as getting something from nothing or something happening for no reason at all, but nevertheless IMHO something’s screwy somewhere. And enigmas like these all lead back to that most fundamental of all issues – what is reality?

Or take another case – Carbon. You’d think Carbon is Carbon is Carbon, but no. Carbon can be charcoal or coal; Carbon can be graphite; Carbon can be a diamond. The various properties of these substances, all just Carbon, drastically differ. Chemistry is indeed weird.

Let’s re-ask the question: How do properties (like charge, spin, mass or presumably being either a solid liquid or gas depending on how you vary temperature and pressure) that all matter (like the fundamental particles, the building blocks of atoms/elements, in turn the building blocks of molecules/compounds) has, morph into properties that only some kinds of matter have, like sweetness, transparentness, hardness, colour, malleability, etc. or properties drastically different from their constituents – like two gases (at STP) making a liquid (at STP).

I’ll just note here that while the fundamental particles, the atoms/elements and molecules/compounds have specific properties, composites like humans do not. The human body for example is collectively a solid, a liquid and a gas. Actually I don’t even tend to think of the human body as an organism but rather a colony composed of billions of micro-organisms, both the cells that make you up as well as all those other microbes that your body plays host to. But that’s an aside.

To be continued...