The first section was about spontaneity. It related to rules, and how to think about spontaneity. I thought this was an easy first idea, just because part of it was review from the last section. The rest was either new ideas or ideas we have already discussed in class. Next was enthalpy changes. This was very easy to understand. It discusses the law of conservation of energy, which is a law we have already looked into. It also was an easy topic to understand. It also discussed exothermic change and endothermic change which we have already looked at for a fair bit of time, so I thought that that part was easy to understand. It also discussed reactions which we looked at in class, and I felt fairly comfortable with those. Next was entropy. Entropy relates to the particles in the system. This all made sense because, while we haven’t done much with entropy in class, I still understood it because of the little we have done. Next was predicting spontaneity in nature. I understood this, however it was a lot of reading. So I feel like more time in class will help me a lot. It was a bit confusing at times, but manageable I think with class time. The rest of the section I found to be fairly confusing, while we have a background in polymers. I felt that this section was hard to fully understand due to the nature of how much there was to study and look at.
- A spontaneous reaction is one that continues to react once it begins.
2. Does the reactions give off heat energy? Does the reaction result in the particles becoming more disordered?
3. If it is breaking and requires energy: endothermic. If it forms a bond and requires release of energy: exothermic
4. From the bonds holding the atoms together.
5. Magnesium and salt water.
6. Basically, a catalyst creates a pathway for the activation energy to need less energy.
7. With a catalyst, the graph starts with higher energy but takes less time to react. Both end negative after losing energy after time.
The first section was about thermodynamics. It was about spontaneous reactions, which I found to be a fairly easy concept to understand. I thought the beginning section of this part was a fairly easy topic to understand. The next portion was about the factors that determine whether a spontaneous reaction occurred. This was an easy concept to understand since it was a fairly commonsense idea. The rest of the chem talk for me was very confusing. I had a hard time understanding all the laws and rules that the book discussed. I think class time will help me understand which laws are important and how each law is applied. Overall, I felt the beginning of this section was easy to understand, but I felt towards the end it became much more difficult. Maybe this was due to poor reading, however I read the confusing sections twice and it still did not maybe total sense.
The first part talked about electrolytes, which is a substance found in gatorade. While I’m not sure if it is the same electrolytes, I found find interesting if it were. The next part described contained rules or information that I found fairly easy to grasp considering we have already finished the lab for this section. The next topic was the path of electricity in a battery. I found this concept fairly easy, I wish I had known about it prior to the lab because it contained a lot of information that would’ve been helpful on the lab. It was filled with concepts already discussed in the lab work, however filled some of the holes that the lab didn’t possess, which I found helpful to my overall knowledge. Lastly, the final section was about the metal activity series. Which in lab, there were predictions relating to this series. I found it helpful to further understand how electricity works when in battery form, and how the metal activity series relates to this. It made a lot of sense when in that way, which I believe is how I predicted the lab would work, without reading the chem talk.
The beginning of the chem talk discussed topics we already had an understanding of. Which I felt pretty comfortable on. Then it discussed how most metals are most commonly found in nature in their ionic form. I thought this was a pretty important concept for later work. Next was a brief history of where chemistry came from. It began with alchemy, which I thought was pretty interesting. The history of alchemy into chemistry is a topic I would find very interesting. Then it talked about how the work alchemists did work that effected modern chemists. They discovered the reactivity of some metals and how some metals react more than others. Again I thought this was interesting because of the influence of the medieval ages coming into the modern ages. Next were equations for oxidation of metals. I thought this section was pretty easy because we learned most of this part in the lab work. It was basically just more in depth reading on classwork. Next was why hydrogen was included in the activity series. As I understood it, HCl was a good test to determine where metals are on the reactivity scale. However, it did not seem like much more than that.
Stoichiometry, is a more math heavily concept in chemistry. In this chem talk, the first section dealt with moles and molar mass. As we have already discussed these two ideas, this was an easy section to understand. One very important concept from this section was that the atomic mass of a single atom in amu is the same number as one mole of that same atom. After that was balancing equations which is a recurring topic for us. It further explained how moles of atoms can affect molecules and how we can look at substances as certain amounts of moles in each formula. The rest of the section was incredibly hard to understand. I was throughly confused. While it upped the math portion quite heavily, I think the only way to understand it is through class time. It used equations and went into detail much harder for me to understand just by reading it.
1: A molecule’s polarity is when there is a difference in charge direction towards one atom.
2: London dispersion forces are attractive forces, weaker than ionic and covalent bonds. It happens with larger molecules especially because with more electrons the larger molecules are more likely to change their charge slightly.
The first section of this chem talk deals with ideas that we thought about earlier in the year. It talks about the ideas of kinetic energy in relation to the different states solids, liquids, and gases can take. I thought this was a pretty easy concept to understand since we already had a background with this knowledge, the only challenging concept would be understanding how the two forces interact with each other. However, I think this will be pretty easy to understand with studying the concepts more. Next was the discussion of partial charges. With the class time we spent on that topic, I thought it was not that hard of a concept to understand. I only think that this concept is newer and thus a bit harder to fully understand, but I think class time will fix that problem. Next was talking about halogens and how their partial charges worked. I thought this was fairly confusing, but somewhat simple. I think I was just a little overwhelmed. I think class explanation will simplify my issues. Last was talking about how some molecules based on their shape will generally take on certain partial charges. I thought the rest of this section was by far the most confusing. I hope that this is either a superfluous section or a section that our class will dive into heavily.
While we have been reviewing covalent bonds recently in class. We have also introduced 3-D ways to show the types of molecules created. Prior to this new idea we had the Lewis dot structure to exhibit molecules. That section was pretty easy to understand as it was just observing how many valence electrons an atom had, and playing with different combinations until a fit was found. With 3-D shapes and the VSEPR theory, this idea gets a little more complicated. Based off of lone pairs and the different bonds an atom can create with other atoms, determines the shape of the end result. This idea is somewhat complicated and I believe that this will require some memorization to fully understand. I also think that this is not a very difficult section, just with fair complication. I think class time will clarify the issues I may have with this subject.
This Chem Talk was about chemical reactions and how most occur in the water. Whether when ions combine from their element, they create certain reactions. Based of on this reaction, the the result of the two solutions can create solids, solutions, something in between. In some cases the ions can attract so strongly that they create solids, for example salt. Next was equations showing and predicting what a mixture would create. While I understood where the numbers came from and what they would mean later in other equations. I don’t fully understand the rule list they created. I’m confidant that class time will clarify those concerns, as while the book is effective in overview. Class time is much more suited for actual understanding. Last was the discussion of what makes a ionic compound soluble, the book stated that the concentration of at least .1 mol/L at room temperature. This I understood as it was an easy number to work with. An insoluble compound was one that had a concentration of less than .001 mol/L. Again this was a fairly easy number, and with our discussion of mols at the end of last term. I was able to understand why and what each number meant.