Daily Post 30/4/12

On your blog describe how the following molecules stick to a positive surface. Describe two things: 1. How much do they stick in relation to each other, and 2. How is it aligned.

NH₃, BH₃, CH₄, CO, N₂, O₂, and CO₂.

(Image created by me)

As shown by the image, NH₃ and CO have a strong particle charge, and BH₃, CH₄, N₂, O₂, and CO₂ have a weak particle charge.

Also, list which molecules of this group you would expect to dissolve in water.

CO, NH₃

Daily Post 25/4/12

Draw / Explain pictures of hot air and cold air. Which one is more dense? Which one is moving faster?















(Images created by me)

Which one is more dense?
If pressure is held constant, hot air will have a larger volume than cold air. Assuming that there is the same amount of molecules of hot and cold air, the density of hot air will be less than the density of cold air. Density = kg/m3

Which is moving more?
Hot air is moving more than cold air because temperature acts like a speedometer. The higher the temperature, the faster the speed of the molecules.

Which is more dense: Dry air or Humid air? Why?

At the molecular level and at the same temperature, dry air is more dense than humid air because dry air contains heavier molecules. If one sample was taken of each air, both samples would have the same amount of molecules in them. The water molecules in the humid air would have replaced some of the nitrogen or oxygen molecules. As a result, humid air would be less dense because waters molecules are lighter than nitrogen and oxygen molecules.