Rate Expressions and Rate Constants

Rate Expressions and Rate Constants

          To start off, Mrs. Friedmann told us she was aware of the fact that there was a field trip tomorrow and that some people wouldn't be here. Tomorrow we will be doing a lab and those not here can use the data posted by Friday's blogger. We will not be doing a write-up for this Lab

       Rate Expressions and Rate Constants packet

          We worked together on the packet we got a couple days ago. The key to what we got through today can be found on moodle here. As the packet shows, there is an easy and hard way to do Example 1A. Mrs. Friedmann only showed us the hard way so we would know how to use it. We will always be able to use the easy way for the questions we will be given.

Homework

• Complete the Rate Expressions and Rate Constants packet by Monday
• Complete the lab worksheet by Monday
• There may be Webassigns for the weekend, but if there are they won't be due until Monday night

I'm hesitant to assign a next blogger because I don't know who is and isn't going on the field trip. We'll figure it out tomorrow.

Lab: Heat of Combustion

Lab: Heat of Combustion

2/18/2014:

           After Mrs. Friedmann checked in the homework, we went over the pre-lab questions (blue sheet). Some of these questions were new to the unit and proved to be challenging. The key to these questions can be found on moodle here. We then moved on to the lab for today.

The Lab:

           The Heat of Combustion Lab involved hanging a can of water over a burning candle, all inside a calorimeter. Some of the data we kept note of was the difference in water temperature and the difference of candle mass. For the purposes of the lab write-up, we are basing our calculations on the assumption that all the heat lost by the candle was gained by the water. Since our heat formula can't be used for the heat energy of the candle, we were told to instead find the heat gained by the water and assume this was the same as the heat lost by the candle. 

          For this lab, we will also need to use a formula for the combustion reaction that took place. This should include heat as one of the products and the use of C25H52 (paraffin) for the candle.

The homework for tonight is:

1) The lab write up is due Thursday

2) There is a new webassign due by Wednesday night

Tomorrow's scribe is:

Serene P.