Links That I Found Helpful

Useful Links

1. Video explaining percent composition and empirical formulas
2. Explains empirical formulas good
3. Explains mole conversions
4. Explains conversions like you're a toddler
5. Explains the combustion problems
6. Explains percent composition

Chemical Composition Unit Test

When your test grade finally hits you

Today I took the unit test. I heard from previous hours it was hard, but I frankly found it to be only somewhat challenging. The only problem with that test was that it was very time consuming. As soon as I got my test I took off and finished the test in no time. Only on 1 I couldn't figure it out until I came back to it and re-read it and figured it out. Although there was somethings on the unit test we didn't even cover I think I was still able to figure it out using a different equation. Overall I can see how people had trouble with it because it was very troublesome.

Chloride Lab

Chloride

We mixed hydrochloric acid with zinc and measured the results. We calculated the ratio of the 2 element. We drove off the chlorine gas from the mixture with a heat plate. That left zinc chloride behind. I found the lab to pretty easy and entertaining except for the fact that the chlorine gas smelled terrible. The pre-lab I didn't expect to do good on and I apparently pulled through and passed it. This just shows how much I am going to have to study for the test over chemical composition.

Before Heating

After Heating

Hydrate Lab

Lab

We took a hydrate compound and drove the water off by heating it with a Bunsen burner. The lab itself was pretty easy and I understood the purpose and the lesson of it. The only thing I found to be a little difficult was the pre-lab. I got the procedure question so I found it to be easy. I calculated the math question for the practice and got the correct answer, but I didn't fully understand every single step which is what I found tricky. Overall the lab/pre-lab were pretty easy, but I feel like the test will be much more complicated. I see quite a bit of studying in my future.

Driving off water & hydrated crystal

Thoughts About The Pre-test

Question Mark

I don't think I've ever had to take a test where I knew absolutely nothing. This was a first. I knew the unit mole and that's it, the rest was completely blank. I tried on the first 5-10 questions, but after that I knew there was no point, when I would try I could never get anything close to the options. I would always get calculations that were just way far off from the numbers. I saw everyone else finishing and so I thought I was getting caught behind so maybe I need to pick things up, but when I looked closer they were just filling in random bubbles because I can only assume they were in the same situation as me. I'm sure there were some people that were familiar with the content. I now know I have my fair share of studying to do this unit!