SG chem 2a

We had a pretty intense week in SG chem 2. We learnt a lot of new material and we are now getting ready for our next unit test (which will be on Friday, October 16th). We started of the week by doing a work sheet about relative mass and the mole. This is when we first even started talking about moles, and I didn't really understand what it meant. The worksheet was spilt up into three models and we worked in our table groups and after model one things got a little easier. Most answers were pretty easy and math was always simple, but you had to make sure you didn't over think some of the concepts.  We white boarded the last part of model three and once we figured out that everyone had the right answer we moved on. I'm glad we started with this packet, because it helped us flow into the next one.

The next worksheet went more in depth about moles and what they are. We learnt that one mole equals 6.02 x 10^23 and since it was hard to imagine that number, there were different analogies on the page to help us visualize it better. For example, it said that one mole of rice grains is more grain than the number of all grain grown since the beginning of time! Another one said that one mole of marshmallows (standard 1in^3 size) would cover the United States to a depth of 650 miles. That is INSANE! But also, SO cool to think about. Anyways, there were 3 problems on the bottom for us to do and we worked together as a class learning about unit conversions and the right way to do them. I think if you follow the method you showed us in class, they really aren't bad at all. 

The next thing we started was a lab. It was called the Empirical Formula Lab and we started off by taking the mass of the labeled beaker, then the mass of the beaker + zinc, and then we heated it up and took the mass of the beaker + zinc chloride and we kept doing that. 

Then we took some observations and then worked on the problems on the back which, thanks to the earlier worksheets, were pretty simple. 

 The last thing we did was white board all our answers on the front board and we came to the conclusion that the Empirical Formula that we all got was ZnCl2.

(here's a cute selfie of table 6 all being safe and working hard!)

The last thing we worked on this week (and got homework on) was a mole practice sheet. It's just a bunch of different and random mole problems, and personally, I think they're pretty easy. We did the first couple together as a class, and like I said earlier, if you do it the way you showed us, it's not that bad. However, we have a quiz on Monday, so this worksheet was good practice. 

We did these together

And this one we did as a table.

Anyways, that was pretty much all we did this week and we did get some more practice for homework this weekend, but I think it'll be good for us and help us prepare for the quiz. Can't wait for next week!! :)