- For a change to spontaneously occur, a chemical reaction has to continue to occur on its own once the change begins.
- Will it continue to occur and how fast will it occur is all determine on if a change can occur spontaneously or not.
- To tell if a reaction is exothermic or endothermic, you have to look at the locations of the reactant energy and project energy which indicates whether the overall enthalpy change is in either one.
- Energy in an exothermic reaction comes from the starting point if it is higher than the ending point, then the system releases heat energy to the surroundings around it.
- The two things chemists use to speed up a reaction in a MRE heater is something that has more surface area and something else that can act as a catalyst.
- Catalyst provide lower-energy alternative pathways for reactions to take so there is enough energy to get over the energy barrier.
- When there is a catalyst, the barrier is smaller so it becomes easier to get over but when there’s not a catalyst the barrier is bigger and the bump becomes harder to get over. In the end, the products go down and end in the same place.
In chem talk 4.7 it talked about Thermodynamics. I heard this word before in Sci-Fi tv shows and movies, but I never understood the meaning of this word. The material in this chem talk was 100% completely new to me. Some topics though stood out to me and really caught my eye. I learned from the chem talk that reactions can occur on their own, and once they begin the reactions become spontaneous. I didn’t understand it at first, but when I took time to let that information sink I realize that it made sense because the meaning of the word when it is not related to chemistry means random. Thermodynamics and Kinetics are theories that will predict when a reaction will occur spontaneously and how the reaction can speed up or slow down. When an energy change occurs at a constant pressure, scientists call this “change in enthalpy.” When the energy change is negative that means it’s an exothermic reaction and if the change is positive that means it’s an endothermic reaction. I never heard these two words in my life. They are completely new to me. Now I am able to find if an equation is endothermic or exothermic. It’s pretty easy actually to find out. You can tell by the reactant energy and product energy, which tell you whether the overall enthalpy change is either one or the other. Something else that the Chem talk mentioned is that when the starting point is higher than the ending point, the system releases heat energy and the enthalpy is negative. Now when the starting point is lower than the ending point the system absorbs the heat energy and the enthalpy is positive. Next I learned about something called “the bump.” The bump is the height of reactant energy. This another name for this reaction energy is called activation energy and it will always be positive. The top part, which is the state in-between the reactants and products is called the activated complex. The last thing I learned was about the catalyst. It is a substance that speeds up a chemical reaction without being used up itself.
- NaCl makes electricity because the crystals dissolve in water the sodium ions and chloride ions separate from the crystal. They can move around in water. Molecular compounds do not break up into ions when they dissolve. The means they can not move around in water and can not conduct electricity, which is why C12H22O11 cannot.
- Electrolyte’s are substances that dissolve in water to make solutions that make electricity and non-electrolytes are molecules that do not form ions in a solution.
- Zinc electrons come from zine metal and then travels through the wire. Then the electrons reach the copper and the copper takes them. Reduction then takes place.
- The anode of a battery is when oxidation takes place and the electrons are released into the circuit. The anode is negative when giving away. It is where the electrons are released.
- The cathode battery is where reduction takes place and the electrons are received. The cathode is positive when receiving and it is also at the end where the electrons are received.
This reading explained many different ideas that we have not gone over in class. I though the Chem talk was pretty cool. In the chem talk, it mentioned it talked about electrolytes, and how they which can generate electricity. Electrolytes are a particular type of nutrient in the human body. The reading also talked about ions. A battery is composed of two half cells. Oxidation takes place in the anode part while reduction takes place in the cathode part. The activity series helps show what is more reactive and conductive. This chem talk apparently clarified many aspects of the lab that confused me.
Chem to go 3-4, 7-11
3. a. Al b. Fe c. Al
4. The pair Al and Pb
(Al -> Al3+ + 3e-) x2
(Pb2+ + 2e- -> Pb) x3 -> 2Al + 3Pb2+ -> 2Al3+ + 3Pb
7. c.) the same
8. b.) Zn(s) –> Zn2+(aq) + 2e-
9. d.) loses a electron
10. b.) electrons from Cr3+ to Al
Briscoe is one of five Kentucky Wildcat players to get an invite to the NBA Draft Combine. He is joined by Malik Monk, De’Aaron Fox, Edrice “Bam” Adebayo, and Hamidou Diallo. This is perfect for Briscoe because this gets him a little bit closer to his goal. Briscoe is projected to be a late second or undrafted draft prospect in this year’s NBA Draft, but if he performs well at the Draft Combine that might put thoughts in the head NBA Gm’s to take a chance on him and draft and develop him. This is big for Briscoe, and he has to perform well. That’s all I have on Briscoe, but now let get started with Chem.
Chem talk 4.4 is pretty much a review of what we did in class today. Some of the stuff was still pretty new because we did not finish our lab in this section. I feel the reading was very informal and I learned a lot about the stuff we did not go over in class. We also reviewed some of this material earlier in the school year. This was a good reading, and I found this reading fascinating, but reviewing something old while adding something new is pretty difficult to do. At the beginning of this year, I thought some of the old material was hard to understand. I don’t have an excellent grasp of this old material, and now adding new stuff is throwing me off, but I think I’ll find before we finish this section. The reading just talked about what we did in class and what we are going to do tomorrow. Peace out.
I’ve been a little busy lately I’ve missed a few classes due to traveling with my AAU team. I’ve had some long days and long nights, but now I am ready together myself back on track. Now here is some Briscoe for all my fans out there.
I know, I know it has been awhile since I talked about Briscoe, but I did not forget about, because there has been some breaking news; Briscoe has declared for the 2017 NBA Draft and has signed Brian Dyke to be his agent. I would like to say congratulations to Brian Dyke on getting Briscoe, because he is going to be getting one of the best combo guards to ever do it. Congrats to Brian and Good Luck to Briscoe with his NBA Draft process. Now lets get started with Chem.
I know Chemistry is the most boring part of my segment, but I have to do it because this is the most important part of my blog. Without chemistry there would be no blog.
In this chem talk I read about the Law of conservation of Matter. When I started reading the chem talk it talked about balancing equations when needed. It also talked about how matter can’t be created or destroyed, but it can change form. But thats a pretty basic quote, because you learn that in like 6th grade. But since matter can’t be created nor destroyed this is the reason why you need to balance your equations when needed. In our past lab my teacher Sir Andre the 4th taught us how to balance equations when he gave us different molecules and different forms of matter to work with. At first I did not understand a word he was talking about when he said stuff about balancing equations. It took three students and a few youtube videos to help me understand. Lucky I was able to catch up quick, because if I fell behind to far you could just kiss a good grade in chem good by. Some of the stuff we did was hard. Molecules with many elements had to be balanced and different names that I didn’t even know were molecules had to be balanced, and at some points I thought I wouldn’t understand it, but now its coming a little bit easier to me; I just got to take my time and really work it out. Well, that’s all I have to say. I guess I will blog to you guys later and hopefully soon.
In the chem talk I feel that I thought the reading had an excellent explanation on unit of the mole. Before the reading I never really understood what a mole was, besides the things some people have on there face. I also thought the way the book explained how pressure effected molecules was interesting. I never really new this much about atoms, but this section goes into real depth about atoms and moles. The chem talked also talked about stoichiometry. The chem talk said that stoichiometry is pretty much the same thing as unit conversions we did back in the fall, but instead of using units we use moles and different types of atoms. This was a good chem talk and I found it interesting how the chem talk related moles, atoms, and molecules to everyday life.
- By figuring out the electronegativity and the Hydrogen ions in the solution.
- CO2+H2O= H2CO3
Chem to Go Question
4) Less than 7
Just want to shoutout the person who inspired me to make this blog, my main man Isaiah “Must See Tv” Briscoe. Happy 21st birthday and good luck with the NBA draft process.
So in todays reading the book talked a lot of different things that I have heard about before. The reading just talked about atoms and how they move and different types of forces. The book talked about three bonds called ionic, covalent, and polar bonds. The book also talked about something I never heard before. Its called van der waals force. I find van Der Waals a pretty cool name actually. I never heard about this and I assume that my class will talk about Van Der Waals today. The book gave goo examples of how much stronger stronger polar bonds then the other two bonds are. The ratio was 1:5:100 so as you can see from the stats it is clearly stronger. I assume that we will talk about what we read in the chem talk in class, and do a lab about this today or take notes, but we will have something to talk about and I assume what we read in the chem talk will be our topic.