Lab 8

Prompt:Post a picture of your setup. Describe the biggest challenge you had while playing, and one thing that you learned through playing.

The biggest challenge I had while playing the game was really just remembering which section was which. When I was saying the equations out loud I would often say the wrong section on accident because I was trying to go to fast, but once I slowed down some it was alright. I also struggle remembering the f section and the transition to get there. The game really helped me to learn the amount of elections that can go in each section, and it helped me to be more comfortable with electron configuration in general.

Lab 6

The purpose of this lab was to combine the compounds sodium hydrogen carbonate and hydrochloric acid, and then evaporate the liquid so you are only left with salt. This lab helped increase my understanding of mass-mass equations and in understanding chemical equations in general.

#1. We determined that  NaHCO3 was the limiting factor. We determined this by concluding that we would need more of this to have a higher yield, but solely increasing the acid amount would not increase our yield.

#2. We determined our theoretical yield to be 1.39 grams. We determined this by first starting through a number of conversions that can be seen in the photo below.

#3. We determined the mass of our remaining solid product to be 1.24 grams. We did this in the steps shown in the picture below.

#4. Our percent yield was 89.2%, which we found by dividing out actual remaining solid product mass(1.24g,) by the theoretical yield(1.39g.).  Error in our percent yield was most likely due to popping of the solution which lost some of the NaCl which would have altered our data.

Lab 5B

Before Picture

After Picture

#1.  The mass of hydrate we used was 1 gram.

#2. The mass of water lost was about .32 grams.

#3. The percentage of water in the hydrate was 32%

#4.  Our percent error was 11%. This is likely due to measurement errors or not having the water fully evaporated. Our water coefficient is probably lower than the correct number

#5 a. .0178 moles of water evaporated

     b. .013 moles of anhydrate that remained in the evaporating dish.

     c. The ratio of anhydrate moles to water moles was 1.37:1

     d. We calculated the empirical formula to be 1 CuSO4 + 1 H20. We did this because they were the nearest hole numbers from the ratio we calculated in step C. 

Lab 5A

The purpose of this lab was to identify a mystery substance from limited data. It helped me to get used to conversions involving moles which I have little prior experience with. With both bags we were only given the weight and another variable. With the first bag we calculated the weight of each atom as we were given moles also and by getting the amu we were able to determine the compound. The second bag was slightly harder as we were given the weight and the number of atoms so we had to do a little more converting.  We had bag "A6" which was Sodium Sulfate and bag "B3" which was Potassium Sulfate.

Lab 4A

Prompt: Post a photo of your well plate(s) after you’ve completed the reactions. Include Question #2 and #3 in your post by writing a the complete molecular equations for 1-10 and net ionic equations only for any chemical reaction in which a solid precipitate has formed. You may do this by writing it on a separate sheet of paper and posting a photo. Describe what surprised you or challenged you most during this lab.


Complete Molecular Equations for #'s 1-10:

 Picture of Well Plate:

 Net Ionic Equations for chemical reactions where a precipitate was formed:

The thing I was surprised most about this lab was that only 6/10 of the equations yielded a chemical reaction. I haven't taken much chemistry so I had kind of assumed that when any two chemicals combined some sort of reaction should take place. The thing I found most challenging was trying to figure out which of the products was the solid and which was aqueous as that was a new concept to me.

Lab 3

Prompt:Summarize the goal of the activity. Post a photo of your finished puzzle. Describe the biggest challenge while completing this activity. Share what you believed your biggest contribution to the group was.

The goal of this activity was to complete a puzzle matching equations and their names. The goal was also to help us get better at naming compounds and identifying compounds by their equation .The equations were a mix between type I, II, and III compounds. I think the biggest challenge was getting used to how the names and equations worked, and then trying to find the corresponding triangle. I think my biggest contribution was helping identify the polyatomic names. I was also in charge of finding the potassium pieces and matching those together.

Lab 2B

Prompt: Summarize the purpose of the lab. Report your average atomic mass for Candium and answer the four concluding questions from your lab manual in your post.

Summary: The goal of this lab was to go through a number of steps to find the average atomic mass for the element Candium. This was achieved by counting the different isotopes(regular m&m's, peanut m&m's, and pretzel m&m's) and then averaging their individual masses. The average atomic mass for our sample of Candium was 1.413 amu.

1. Our atomic mass would be different because our sample sizes would have different numbers of each of the isotopes. Because the calculation for average atomic mass is based on the percentage of each isotope, if you had different percentages of the isotope your atomic mass number would be different.

2. If larger samples were used the difference between my sample and other group's samples would be smaller. When sample size is increased, your result is more accurate and representative of the correct value.

3. No. The average atomic mass is an average of all the isotopes, so it is not the exact weight of any of the isotopes, so if you weighed an isotope it would most likely not be the average atomic mass.

4.