Assignment #13

NH3, BH3, CH4, CO, N2, O2, and CO2
all have a overall negative charge based on their electronegativity so they will still to a positive surface. NH3 will stick together in relation to each other the strongest because their electronegativities are the furthest apart based on the periodic table. How is this aligned from lowest to highest??
NH3, BH3, CH4, CO2, CO, N2, O2.

Which molecules would be expected to dissolve in water??
NH3,

Assignment #12

1) This picture basically explains it all, cold air is more dense because with warm air the gas particles will expand more (higher volume). Using the density=mass/volume this means that density and volume are inversely proportional. So an increase in volume (warm air) will cause a decrease in density and therefore be less dense. However the warm air particles are moving more because an increase in temperature will cause the molecules to move around more (more kinetic energy).

2) The amount of water vapor in the air effects the density of the air. Water vapor is a light gas when it is compared to Oxygen and Nitrogen, this means that when water vapor increases the amount of of oxygen and nitrogen will decrease. This causes the density to decrease. This means that moist air will be less dense than dry air because it has more water vapor.

Assignment #10

Energy densities from lowest to highest:

Lithium-ion Battery: .72 MJ per kilogram
Ethanol: 30 MJ per kilogram
Gasoline: 47.2 MJ per kilogram
CNG: 53.6 MJ per kilogram

Assignment #11

The shapes og molecules are very important in their reactivity with the human body.  Post a 3D image of caffiene and cocaine and show how the shapes of these two molecules are quite similar.

 this is a Caffeine molecule

this is a Cocaine molecule

As you can see they have blue, red and black atoms in their molecules. Meaning they are made of the same type of elements. 

Assignment #9

"I started with 2.0 g of salicylic acid and 5 g of acetic anhydride and I got 2.1 g of acetylsalicylic acid (aspirin).  1) What is my theoretical yield and my percent yield?"

-first you are going to find which one is your limiting reagent by converting each mass (salicylic acid and acetic anhydride) into moles of aspirin. Which ever one produces the smallest amount of moles will be the limiting reagent.
2.0 g C7H6O3 --> .014 mol aspirin
5.0 g C4H6O3 --> .049 mol aspirin
So the limiting reagent will be C7H6O3. Now you will use this to calculate how much grams of aspirin will be produced. This will be your "theoretical yield" After this is found you will divide the actually yield you produced by what you should have produced to get your percent yield.
2.1 g / 3.77 g = .557

The percent yield will be 55.7%

Assignment #9

1)Today in class we discussed limiting reagents.  On your blog, describe the process you used to determine how many quarter pound hamburgers could be made.
-For this problem we had to first decide what our limiting reagent was (the agent that would cuz us to have to make the least amount of hamburgers). We decided that this would be the bacon because we only had enough bacon to make exactly 35 hamburgers. We had enough hamburger to make 40 hamburgers but because we didn't have enough bacon we would have to make only 35 hamburgers.

2)For the following reaction determine which reagent is limiting and how much of the product can be made:
2H₂+ O₂ → 2H₂O
Begin with 8.5 g of hydrogen (H₂) and 40.2 g of oxygen (O₂).
-O2 will be the limiting reagent for this chemical reaction
the process is starting with 8.5 g of hydrogen and determining what amount of oxygen this will produce. Since it produced67.324 g of oxygen that is way more than 40.2 g of oxygen (which is what you begin with). So that is the limiting reagent.

Assignment #8

1) REDOX
-2C8H18 + 25O2 --> 16CO2 + 18H20
This is the reaction of what happens when you drive your car, this is interesting to me because driving my car is something I do almost everyday.

2)PPT
-CaCO3 + H2OSO4 --> CaSO4 + H2O + CO2
This is acid rain on a marble statue. I thought it was interesting that a solid formed from acid rain falling on a statue.

3)Gas Forming
-CaCO3 + H2OSO4 --> CaSO4 + H2O + CO2
This is the same once as up above (acid rain on a marble statue) But it can also be a gas forming reaction because CO2 is formed from the acid rain and marble.

4)Acid-Base
-HCl + NaOH --> H2) + NaCl
I couldnt find an everyday acid-base reaction so I just chose a normal one in our chem book to show that an acid and a base will always form some type of salt and water.