Post #7 !!

This week in SG Chem 1, we did a lot concerning the pressure, temperature, volume, and particles in a gas. These were the main ideas. They're connected because they're all measurements having to do with a gas. Some important details to these main ideas are that standard pressure is 1 atmosphere, and standard temperature is 0° Celsius, or 273 Kelvin. We normally use Kelvin to measure temperature of a gas because Celsius that could cause a negative pressure, volume, or number of particles, and that's not possible. 

We did a lot of worksheets measuring different variables of a gas. Let's look at one of our problems as an example:

You fill in the initial row of your graph with the measurements the gas starts with. You have to change the 25° Celsius to Kelvin, so you add 25 to 273. That gives us 298 Kelvin. A number of particles is not given, so that variable is constant. For the final row, you fill in the set of measurements for after the pressure and temperature are changed, which would be 760mm (or 1 atmosphere) and 273 Kelvin (the standard temperature). Then you fill in the effect row with the change that's happened. If the number went down, you write a down arrow. If it went up, write an up arrow. Since pressure went up, we can assume that the volume will go down, because they're inversely proportional, and since the temperature went down, the volume will again go down because temperature and volume are directly proportional. Fill in those arrows and move on to the equation. You have to multiply your initial volume by your initial pressure over your final pressure (so the volume will decrease), and your final temperature over your initial temperature (so the volume will decrease again). The equation ends up being 250 x 730 x 273 ÷ 298 ÷ 760 when you type it into a calculator. Hit the enter button and the answer comes out to be 220 cubic centimeters.

We did an experiment we did today involving pressure. Mr. Finnan put a blown up balloon in a sealed space and slowly sucked the air outside the balloon out of the space with a vacuum. The balloon grew until it eventually popped. The reason this happened was the pressure outside the balloon was decreasing and inside the pressure was increasing until it popped.

This week we also went over what we've done so far in class this unit. A whiteboard containing all that information looked like this:

Our class has gone over a lot about particle movement and movement of a gas this unit. We've done a lot of experiments involving gas and measuring it. We've learned how to measure the pressure, volume, temperature and number of particles of a gas in many different situations. 

I don't have many questions about what we learned this week, I think the worksheets we did explained everything pretty well. My participation this week was pretty good, that's how I came to understand this material so well. What I would work on more is knowing how measurements are related when not related to pressure, like temperature to volume or volume to number of particles. It was interesting to learn about the kinetic molecular theory and how gas particles are randomly spread out, and just more about gas in general.