HS1 Physics1 Arranging Atoms

Intermolecular Forces

"Well we can model the case of a lonely electron, but that's not so nice. Life, and physics are more interesting when we consider interactions."

-- One of my college professors.

A Desolate Universe

* desolate - bleak, empty, barren.

Image a universe where there are only 5 atoms.

If the atoms are all of the same type and they must be connected in a line, how many molecules is it possible to make?

A Brighter Universe

So there are still only 5 atoms, but this time each is of a different kind. If they must be connected in a line, how many different types of molecules could you make?

We're Lucky to Have Patterns

Changes in Temperature

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Energy, Temperature & Motion

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Changes of State

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Linear vs. Plateaued

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Intermolecular Bonds

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It takes energy to separate atoms.

Vending Machine Coke

If you ever find yourself stateside and you look at the display on a vending machine, you'll notice Coke is advertised as being 32° F, that's 0° C.

How is it possible to see liquid Coke at 0° Celsius? Wouldn't it freeze?

Practice Problem

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l_{fusion} = 0.334\ \dfrac{kJ}{kg}\\ l_{vapor} = 2.260\ \dfrac{kJ}{kg}\\ Q = m \cdot l

How much energy does it take to boil a 100g ice cube?

(The ice cube starts at 0°C)

Practice Problem

How much energy does it take to boil a 100g ice cube?

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c_{ice} = 2.108\ \dfrac{kJ}{kgC}\\ c_{water} = 4.187\ \dfrac{kJ}{kgC}\\ c_{steam} = 1.996\ \dfrac{kJ}{kgC}\\ Q = m \cdot c \Delta T