Week 33

This week in Chem, we didn't learn much of anything new. In the beginning of the week, we did an assessment that was the same one we did in the beginning of the year. It didn't count for a grade or anything but just something to see how we progressed. Some of the concepts I was a little shaky on but I think I did pretty well overall. Then, we did the silver coke bottle lab. It wasn't a very difficult lab, but needed to be followed exactly. First we all got to drink our pops, I didn't get a coke though:(. Then, we put 10 mL of dextrose into the bottle and sealed it with a rubber stopper. In a beaker, we put 40mL of silver nitrate in and added drops of ammonia. The solution turned brown, and formed a brown precipitate, but we kept adding drops until it was clear again. Next, we added 15 mL of potassium hydroxide into the solution of silver nitrate, and again added drops of ammonia until it was clear. I actually added 50mL of potassium hydroxide to my solution, but the product still came out great. So, we carefully poured the the mixture into our bottles, put on the stopper, and began to shake it, making sure we covered the entire inside of the bottle. After a while, the solution began to form that silver lining on the inside of the bottle and you couldn't see through it. So once you couldn't see through, we carefully poured the mixture down the drain, rinsed the bottle, and left it there upside down to dry. We didn't get to take home the bottle until the next week though. When the seniors were taking their exams, we broke off into groups and used the standards for the past few units to make a PowerPoint study guide. We finished these study guides in class and can use them to study for our final. I'm very nervous for our final and will have to prepare very much to make sure I'm ready by the time we take it.