More Gas Problems
Tro Problem 5.48
A 1.0 L container of liquid nitrogen is kept in a closet measuring 1.0 m by 1.0 m by 2.0 m. Assuming that the container is completely full, that the temperature is 25.0 C, and that the atmospheric pressure is 1.0 a
When moles are not moles and atmospheres are not atmospheres
Chemists are Pragmatists
Most gas phase reactions occur in sealed flasks you've got to keep the reactants from escaping!
That means that, typically, the volume is fixed
Beyond Simply Energy
2 H2 + O2 -> 2 H2O
Given a chemical reaction: 1. Does it happen? 2. How fast does it happen? 3. Is it an equilibrium reaction? 4. How does it compare with a competing reaction? (If I mix H2, O2 and N2, what do I g
Beyond Lewis Dot Structures
Molecular Structure & Bonding
A molecular structure, unlike a simple molecular formula, indicates the exact 3D nature of the molecule. It indicates which atoms are bonded to which atoms, and the 3-D orien
How fast is it?
Kinetics is all about the rate at which a reaction occurs. How fast are the reactants turned into products?
Consider a general reaction:
Kinetics is all about the rate at which a reaction occurs. How fast
Practical uses of solutions
A colligative property is a property that depends ONLY on the amount of the substance present NOT on the identity of the substance. In other words, it doesn't matter if it is sa
Properties of Solutions
It's all about the interactions.
What do you need in order to have a solution?
A solvent and a solute. What's the difference between a "solvent" and a "solute?
There's more of the solvent than the solute.
Why do we care so
Ideal Gas Law
Solids, liquids and gases
There are 3 main states of matter: Solids Liquids Gases
Each of the 3 have properties that are unique, but there is a gradual transition from one state of matter to the other.
Love & Hate in the Molecular Realm
If I put 2 molecules into a sealed flask, what could happen?
They ignore each other. They LOVE each other they're attracted to each other They HATE each other they repel each othe
Bonds and Molecules
What holds molecules together?
Bonds Bonds are made up of?
Electrons How do the electrons hold atoms together?
Ionic Bonds attraction between ions of opposite charges
Covalent Bonds sharing of
Putting it all together
One more example:
What's the Lewis Dot Structure for SeO2?
1st question: What's the total # of valence electrons?
Dot structure for SeO2
18 total valence electrons.
Next question: What's the cent
Calorimetry of Chemistry
In our earlier discussions of calorimetry, we used physical sources of heat (hot metal slug). It is also possible to use chemical sources of heat (like hot packs and cold packs).
The energy change
Energy, heat: Uses and implications
Energy is actually like pornography: easy to recognize but hard to define.
Energy is sometimes defined as the capacity to do work. Work is the result of a force acting over a distance. Ener