Why salt dissolves in water

Why does any substance DISSOLVE into another?!

In the case of SALT and quite possibly most other cases, the water molecule (H2O) literally pulls apart the sugar molecule (NaCl).

POLARITY! Some molecules have a greater POLARITY than others and H2O is a prime example, the Oxygen atom is HOLDING the bulk of the ELECTRONS within the molecule so we'd say that the Oxygen is the NEGATIVE end (because Electrons are NEGATIVELY charged), therefore the Hydrogen ends are POSITIVELY charged because there are LESS Electrons present.

An NaCl molecule is the same, the negative end is the Chlorine and the positive end is the Sodium.

Due to the fact that there's typically more water (water could dissolve into salt if there was more salt than water), we'll look at it from the this perspective.

The positive Sodium is ATTRACTED to the negative Oxygen and the negative Chlorine is attracted to the positive Hydrogen.

That's fundamentally it, the polar forces of the water molecule, due to strength and volume, rip apart the salt molecules.

Thanks

Adam X

Why blowing on soup cools it down

Lets take it to the molecular level!

You pour your soup into a bowl, chuck it in the microwave for 2-3 mins, wait for the ping then you take it out.

It's HOT!

It's too hot for you to eat immediately but you have 2 choices:

Wait for it to cool

Blow on it

Blowing on soup works in a similar way to an air-con system. 

The molecules that comprise the soup are JIGGLING because they're HOT and have lots of ENERGY. Some molecules will have EVAPORATED because they had enough energy to escape the liquid state. 

There comes a point where the molecules stop evaporating but they're still hot, too hot for you to consume even. We've reached a point of zero evaporation. Therefore we need evaporation to start again so we need to ENCOURAGE these hot molecules to leave the soup by literally blowing them away!

The HOT MOLECULES are taking away the HEAT with them, leaving behind a COOLER and more edible soup.

The AIR-CON reference is fundamentally because that works by BLOWING sweat off your skin, cooling you down :-)

Thanks

Adam X

Lack of posts

I fully aim to get posting again ASAP, I've set myself a 2 minute challenge to write as many new facts as I can remember! Here goes:

Snakes "use" only 1 lung, saves space when eating!

The Moon was only 14,000 miles from Earth when it first formed.

There is 400 million litres of WATER on our Moon!

A distance further away from you is easier to get to the LONGER it takes - SPECIAL RELATIVITY

Oil companies spend 1/2 a TRILLION DOLLARS every 2 years looking for OIL. If we harnessed he Suns energy, eventually we wouldn't have to spend anything.