Lewis Structure Lab
We did a lab where we went into the library to work out lewis structures on white board tables. We had to find the structure, shape, polarity, bonding and non bonding pairs, hybridization, and VSEPR formula for different molecules. Some of the molecules included BeH2 and PCl5.
Polar Bonds
In this lesson, we learned about polarity and the different kinds of bonds. In order for a molecule to be polar, the bonds must be polar which means that the electranegativity needs to be be more on one side of the bond than the other. This section was a little confusing for me, so why not post more links.
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Resonance
In this lesson, we learned about structure and resonance. In a nutshell, resonance is when a lewis structure can be drawn in multiple different ways for the same molecule. The shape change is displayed by a double headed arrow between the two structures.
We also checked out the shapes of molecules. When there is a structure with no non-bonding pairs, we have 5 different regions the structure can be. Depending on the number of bonds, it can be linear, trigonal planar, tetrahedral, trigonal bipyramid, and octahedral. If there are non-bonding pairs, the shape can be a asymmetrical form which will also be polar.
For more info check out this link here. Also check the one out under the photo.
We also checked out the shapes of molecules. When there is a structure with no non-bonding pairs, we have 5 different regions the structure can be. Depending on the number of bonds, it can be linear, trigonal planar, tetrahedral, trigonal bipyramid, and octahedral. If there are non-bonding pairs, the shape can be a asymmetrical form which will also be polar.
For more info check out this link here. Also check the one out under the photo.
Lewis Formulas
We started our new unit about chemical bonding. Its mostly about the relationships between electrons. Our lesson was about lewis formulas which is used to display chemical structure of molecules. There is a certain equation you use taking the sum of the electrons you have and what you need to find the amount of bonds in the structure. We also learned about bonding and non-bonding electrons. For some more info, check out this link here. Also check out the link under the photo.
Electron Structure Quiz
We did our electron structure test today. It wasn't too bad, but I'll probably do bad like the rest of the test. I didn't study the ionization level section too much so that stumped me on the test. I knew most of everything else, but we'll wait until I see my grade. I liked the frequency and energy questions because that was what I was an expert on. It was physics all over again!
Element Properties
We were given a sheet with different riddles about element properties and we were to place them on the S and P sections of the periodic table. It was pretty easy and it spells out a phrase.
We then did another based on periodic trends. This was much harder. We used density for some of the graph and then ionization levels for the rest of it. For more info on periodic trends, check out this link here.
Analysis of Cr and Co
This was an interesting lab. We used a device I've never heard of before called a spectrophotometer. We started by using a tube of water to set the device to 0% transmittance. Then we place the blue tube in there, which is Cr, and the the red tube, which is Co. We measured the absorbance of light and the %T of light.
Quantum Numbers
We had a new lesson today about quantum numbers. Every element is assigned to a specific quantum number which identifies it by energy levels and electron structure. There are things called orbitals which take over certain parts of the periodic table. Check out the link under the photo under the picture.
Flame Test Lab
This lab we did was very cool. We took different metals and held them up in a flame to see what color the flame was. We then used the wavelength of that color to find frequency then used frequency to find the energy per mole of the light. Some of the metals glowed green and pink which were very cool.
This is a picture of our Bunsen Burner set up and us putting LiNO4 into the flame, causing a hot pink flame.
Electronic Structure
We started our new unit today and it so far is much easier than the last two units. It is about electronic structure. We first learned how light is electronic energy that is carried through space. All electronic energy can be characterized by waves. A couple relationships arise from this concept. The two we learned were wave speed = frequency x wavelength and energy = planck's constant x frequency. Check out the link under the picture and the link here for more info.
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