Time and money

I will probably settle with this watch from Ventura...


...since I don't have enough money to buy...


Actually, I don't even know how much the first watch costs, might not even afford it.

Ok, just checked the price for the first watch: $2000 US!! I can only wonder how much the Cartier costs. That's it! I will rely on the sun to keep track of time from now on!

Sigh... time > money

Gold is not forever with aqua regia

Concentrated hydrochloric acid or nitric acid alone cannot dissolve gold.

Aqua regia, a mixture of hydrochloric acid and nitric acid, can dissolve gold because each of its two component acids carries out a different function. The nitric acid is a good oxidising agent. Chloride ions from the hydrochloric acid from coordination complexes with the gold ions, removing them from solution. Reducing the concentration of the Au3+ ions shifts the equilibrium towards the oxidised form.

Nitric acid/hydrochloric acid with gold on either side, aqua regia with gold in the centre

Au(s) + 3NO3-(aq) + 6H+(aq) ---> Au3+(aq) + 3NO2(g) + 3H2O(l)

Au3+ (aq) + 4Cl-(a) ---> AuCl4-(aq)

Calories and so on

How much is 200 calories actually? Well, it's about 800 joules. What is a joule?

As a rough guide, 1 joule is the amount of energy required to lift a one kilogram object up by a height of 10 centimetres on the surface of the Earth.

Or

The energy required to lift a small apple (102 g) one meter against Earth's gravity.

Or

In chemical energy stored in food.

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Goodies: Celery (Apium graveolens dulce)
It is sometimes grouped as a low-calorie fibre bulk food. Not only does eating it will result in very few calories (actually negative, because digesting it requires more energy than the celery contains), it has a lot of vitamin C and fibre.


Baddies: Bacon (Sus scrofa domesticus)
Ewww.... I hate bacon. Not only does it tastes gross, it is full of fats: saturated, and worse unsaturated. Out of unsaturated fats, there are cis and trans fats (cis-trans or geometric isomerism - if you take chemistry).

cis

trans

Now it's the trans fats that we all talk about. Even your grandparents know what they are. Trans fats are bad for you! And indeed they are. It's all down to geometric isomerism. The C=C double bond in the trans isomer of the fat cause its rigidity and high density and make them hard to remove out of your body. I say they stay in your body forever (well a very long time)!

Anyways, some biology, some chemistry, some physics for you. What a happy post!