4.8 Chem Talk

The spontaneity section of the chem talk was interesting. It introduced lots of new ideas, I especially liked the section that spoke about the open system v. the closed system. The example they used for the closed system was a thermos, but a cooler is what I first thought about. After that the reading then becomes extremely confusing. I got lost when it began to speak of predicting spontaneity in nature. I also got lost after they discussed the properties of polymers and monomers. For example I was confused when the terephthalic acid was mentioned.

4.7 Checking Up 1-7

  1. It means the reaction to continues on its own once it begins.
  2. Do the particles become more or less organized? and Does the change give off heat when it occurs?
  3. If the reactants give off heat they are exothermic. If they gain heat energy they are endothermic.
  4. The activation energy that is added to supply the bump.
  5. Iron
  6. Provides a lower activation energy.
  7.  When the catalyst was being used less total energy was needed to get the products.

Chem Talk Section 4.7

I feel as if this reading referenced the lab more than any other reading we have done so far. This caused for slight confusion because the reading would repeatedly refer to something that I had not done yet. This was an average length, but they condensed much more information into the reading than typically done. I understood it for the most part, but then the energy diagrams came into play and I became much more confused. I am interested however to get farther into thermodynamics and learn about that.

Chem Talk Unit 4.6

This reading introduced lots of ideas that we had not yet talked about in class. The reading was interesting because the whole time I read it I was thinking about gatorade. Many times in the reading it mentioned electrolytes, that can generate electricity. This showed me that gatorade has a lot more chemistry behind it then I thought. Previously I thought it was just sugar water. But now I realize that all the electrolytes help to recharge me after sports. The reading also talked about ions again which was a nice connection that helped with the new lesson. 

Section 4.4 Chem Blog

This reading was very informational and beneficial for reviewing what we did in class today and what we went over earlier in the year. This reading was a very typical reading, somewhat interesting, but reviewing something old while adding another layer of something new. At the beginning of this year, it was difficult to understand this, but the more that we do it the more I learn that this is actually a great technique of teaching new material. The reading itself basically summarized what we did in class today with the lab.

Section 4.3 Chem Blog

This reading did a good job of reviewing what a mole is. It also introduced the idea of how pressure can effect molecules. It also added a whole new level to stoichiometry, such as dimensional analysis. Which is similar to unit conversions but no longer with usual measurements, now we will be using the number of moles an element is made up of. It also began real life application when it discussed percent yield. Overall this reading was somewhat interesting, and did a good job of applying what we are learning to real life. 

Section 5.2 Checking Up Q’s 1-3 & Chem to Go #4

  1. A molecules polarity is the two different charges that one atom has defined by its poles.
  2. London Dispersion forces are the forces that drive two atoms to bond. The larger the molecule the stronger the attraction.
  3. C7H16

Chem to G0

4. b. The intermolecular forces in water are stronger than those of methane. 

Chapter 5 Section 2

In this reading we reviewed everything that we went over in class today. The reading simply discussed atoms moving and the different forces. Such as ionic, covalent, and polar bonds. The book also discussed van der waals force. Something that we did not discuss today in class. This was a good way to show how much stronger polar bonds are. The ratio was 1:5:100, so clearly polar bonds are much stronger than the other two bonds. Which is something in class that we began to touch on but ran out of time.

Section 7.8

This reading was very clarifying and helpful to what we are doing. The first part, Lewis structures, was a nice refresher on how to draw the diagrams the right way. It was also helpful in adding the next step of speaking about polarity and how relevant the structure of the molecule is. This was interesting because we have not yet spoken about this in class. VSEPR (besides being fun to say) was also helpful in discussing the importance again of the molecular structure and how it changes different aspects of the molecule.

Section 3.6 Chem Blog

This reading was hard to understand. Just because we did not get very far in the lab and the lab was not very conclusive. The main point still gets across however, I understand what the book is saying, and compared to some of the other sections, this is explained much clearer. We have not done this yet, where we do the reading first and then do the lab in class. I am excited to this, where we have the understanding first and then apply it to what we are doing.