Unit Test

Studying:
For this Unit what I really need to do is do A LOT of practice problems. I think another thing that will help me is reading through the textbook and taking notes along the way. That way, I get the definitions down so I don't get confused between terms. Then, I can do the practice problems in the textbook to go along with the material I read. Hopefully practice will make perfect.


Reflection:

The Unit test was honestly terrifying. The main problem was the time we had to finish the quiz. I felt so rushed and it stressed me out. I feel like if  we had a lot more time for all of those problems, I would feel better about it. In general, I think the hardest part, material wise, was remembering the different methods for each problem since there are so many problem times that have similar yet completely different solution paths.

Formula of a Chloride lab

 This lab was really cool because there was a significant difference between the starting zinc and the end zinc chloride. It really helped us see the chemical reaction occur. However, it took a long time to wait for the HCl to evaporate and it smelled really weird too. This lab was also good practice for making the formula calculations. It also gave us a hands on application which I always learn better with. I thought the math would be really hard but it really helped me that the questions were step by step and guided me. I really like those kinds of problems because it guides me into how I should solve the problem which is always what I have trouble. However, it's scary because if you get one problem wrong, you're most likely going to get multiple wrong. It's a good thing we did this lab because I need all the practice I can get

Formula of a Hydrate lab

This lab was really cool and I'm really glad we passed the pre-lab quiz (those always stress me out)! It was cool to be able to physically see the change from the hydrate to the anhyrdide. I think this lab was helpful because I'll probably remember this material better since I had hands on experience in the lab. I think it was also really good practice for calculating the formulas of the hydrates and finding the variable n. I definitely am better at calculating those values after all the practice. Since we ran out of time in class, we didn't get to heat the hydrate multiple times. If I had to do this lab again, I would heat it more and see how much of a difference that makes.

Unit 6 Summary

Mole: 6.02*10^23 the number equal to the number of carbon atoms in exactly 12 grams of pure 12C

Steps To Solving mole Problems

• decide what the questions ask 
• write down the given info
• label all quantities

Mole problems road map

http://media.showme.com/files/28315/pictures/thumbs/492108/first_thumb1352935272.jpg

Hydrated Compounds

• contain water molecules in formula
• contribute to the crystallize structure of the compound 

Nomenclature of Hydrates

• Anhyrdride*nH2O
• CaSO4*2H2O ----> Calcium sulfate dihydrate

Calculating "n"

• find mass of dry anhydride (mass of final product-mass of test tube)
• find mass of hydrate: (mass of starting product-mass of test tube)
• Mass of Hydrate-mass of anhydride= mass of water driven off
• convert mass of water to moles 
• convert mass of anhydride to moles 
• Anhydride moles/ water moles = n

Helpful links: 

this video is kinda cheesy but definitely helpful!

this website summarizes and defines everything really clearly

Links for practice: 

http://www.chemteam.info/Mole/Determine-formula-of-hydrate.html

http://www.chemistry.wustl.edu/~coursedev/Online%20tutorials/Plink/moleskey.htm

Pre-Test

This was definitely the hardest pre-test I've taken in my life and I'm terrified for this unit. I'm pretty sure I guessed on 99% of the problems and I'll be happy if I got even one right. However, this pre-test has made me aware that I will probably need to work really hard for this unit and I plan to do just that. Hopefully, when we start learning the material all the questions will start making more sense. It seems like it involves a lot of math that I've never seen before. I really hope the unit test will prove to be easier for me and hopefully I will gain redemption at the end of the unit.