Blog Week 20

On Monday, we went reviewed what we were talking about on Thursday. We learned that when comparing one element's mass to another, we get a ratio that is unique to those elements. We did some examples and my group got assigned question six, but we didn't finish it completely. We did an equation that is: x=mg, 0.65x=O, x+0.65x=100g and we got the answer earlier and x=60.6g. This picture below shows another example we did. The first part is each element over the whole solution. The second part we divided the top number by the bottom to get a decimal then moved the decimal place over to get a percentage. These percentages where the percentage of each element in the solution.

On Tuesday, we did a lab. We wanted to find how much and how many of each hardware tool we had. We related how much to how many, which for food is serving size, but for our experiment we called it Quinn. We also wanted to find the relative mass of each hardware, which is the mass divided by the smallest mass. The picture below shows the results from the lab. For the Quinns we did the mass of the whole jar mass minus the empty jar to get a Quinn.

On Wednesday, I was absent.
On Thursday, we learned about a mole and molar mass. A mole is a group of particles that contains Avogadro's number of particles. Another definition is that it is the measurement that relates how much to how many. The last definition we gave it was a proportion of grams to the number of particles. One mol of Hydrogen. We learned that the molar masses are compared to Hydrogen. Molar mass is the same as the relative atomic mass relative to Hydrogen. This picture to the left shows some molar masses of some substances. Atomic mass unit, a.m.v., equals one Hydrogen unit to measure atoms. Relative atomic mass and molar mass are the same number, but different units. So we did a problem, it was this: 55.845 amv x 6.02 x 10^23 = 55.845 g. You can see in this problem the numbers are the same, but the units changed.
On Friday, we had a sub, so we did a worksheet. I did numbers one through three and my group got assigned number four. I did all the questions right I checked them using the answer key on google drive. I understand how to do these problems now. I know that you must know the atomic masses of the elements to solve the problems. I tweeted you number four on Friday during class.  I did one through three in my notebook.

Blog Week 19

On Monday, we did Zn + HCl Lab. But first we discussed the properties of gaseous substances, which were combustibility and flammability, which mean the same thing. For the lab we took the trough filled it with water, put a bell jar full of water over the hole and then had a flask of hydrochloric acid and we dropped zinc into it. Once the system was topped off with the cork, the bell jar captured the water. We wanted to find the mass, volume and density of the system before and after the we added the zinc. In my group though our stopper/cork was too small to close the system, so we did not get any measurements. On Tuesday, my group got a chance to redo the experiment and actually see the gas get collected and test if it was combustible. We found out that the gas made was combustible. Our observations from the experiment were that the hydrochloric acid looked like water, the flask got warm when we added zinc and after combustion the flask got colder. We then considered what the gas in the bell jar could be. We decided we had three options: hydrogen, chlorine, or zinc. We eliminated chlorine because it's a yellow color and a poison and we also eliminated zinc because it has a high boiling point. So, the gas made had to be hydrogen, because it was the last option left and H2 is combustible. But, as we tried to figure out our equation we noticed that a second compound was made ZnCl2. We also noticed that a third was mad that was H2O because the hydrogen combined with the oxygen in the air to create water. We know this because there was condensation inside the bell jar after combustion. The picture below shows the equation for this lab.

On Wednesday, I worked on the skills practice worksheet. I understood how to balance the equations, but other than that I wasn't sure how to complete the other things.
On Thursday, we talked about diatomic elements, they in pure element form and they come in pairs. We learned that when they join into other compounds the diatomic element become single atoms. We then talked about how H2O and H2O2 compared, we assumed that all their atoms were the same mass/size. So, we did an experiment to test our theory. We took Magnesium and set it on fire. But we measured the mass before and got .37g. After we combusted it we knew that it'd combine with the oxygen in the air to make 2mgO. So the mass after we combusted it was .45g. This proved that we can't assume atoms are the same size. Oxygen mass= 21% mass of mg.
On Friday, we had a snow day!!

Blog Week 18

On Monday, we didn't have school. On Tuesday, we went to computer lab. In the computer lab we did a virtual lab and answered questions. On Wednesday, we went over the virtual lab. We the learned that are diatomic gases and some of those are oxygen, chlorine gas and phlogiston.

In this picture we can see that there are two phs in each of the first two boxes and the last two. Then there are two Os in the third box and the last two boxes. We learned that if the we combined an O to each of the ph boxes we'd get a mystery gas.

In the next drawing we see that the mystery gas is water, which lead us to the conclusion that phlogiston is hydrogen. Which the picture to the right shows that it is in fact hydrogen. The equation is H2+O= 2H2O.

The picture to the right shows the equation for hydrogen chloride. It's H2+Cl2= 2HCl. This is the equation because you must spilt up have an equal amount in each box at the end, and to get that one H and one Cl had to be in each box which gave the gas HCl.

This picture to the right shows that if you were to have the equation 4H2 + 4Cl2 it would equal 8 HCl. It's that because, the equation H2+Cl2 it would equal 2HCl. So, we'd could multiply 2HCl by 4 and get 8HCl.

This picture to the right shows an equation with elements. We want to divide them up evenly. We can spilt compounds and make compounds to get the answer. We stopped here on Wednesday.

On Thursday, I left school early, not feeling well, so I missed the explanation.

On Friday, I had a doctor's appointment, I'm pretty sure I missed an assessment.

Blog Week 17

I wasn't sure if we were suppose to blog for week 17, so I'm doing one just in case. On Monday, I was absent. On Tuesday, we talked about the lab that was done on Monday. We then worked on the problem: 49 grams of salt dissolved in 121 grams of H2O. So. decided that salt/ over the whole solution would give us the percent composition by mass. So we set up the problem 49/121+49. which would equal 49/170= 28.8%. After we discussed that we went on to compare mixtures and compounds. Mixtures are two or more elements/pure substances mixed together without being joined. Compounds are two or more elements/atoms bound together. Compounds are a fixed ratio. So,we then planned how many game. We had two elements, which can make one mixture and eleven compounds. On Wednesday, we learned properties of metals and non metals. The properties of metal are: solid at room temperature, higher density, hardness, luster-bling-shiny, conductive-heat-energy-electricity; malleable-ability to bend, shape, play like play dough and higher melting point and boiling point. The properties of nonmetals are: liquids or gases at room temperature, poor conductors.  no luster, brittle-in solid state-breaks easily, lower density, and lower melting point and boiling point. Then we found that Ca3P2 means that it has 3 Ca and 2 P. We then learned that (NH4)2O equals 2 N, 8 H and 1 O. We learned that H2 is called dihydrogen and O is called monoxide. CO is carbon monoxide. We learned three rules and they are: Rule #1: subscripts in compound formulas, tells the number of atoms in a compound. Rule #2: Subscript matches up with prefix *Exception: if first element is only one atom then leave out the "mon". Rule #3: Last name gets changed to "-ide" Ex- Oxygen--> Oxide. On Thursday we learned that H2O is a 2:1 ratio. If we had 50ML of H2O then the volume of each molecule 25 ML. Here's a picture of molecule diagrams.

On Friday, we reviewed for the midterm it really helped going through the review sheet.

Blog Week 15

On Monday, we went over the assessments and I didn't do as bad as I though I got mostly threes and fours. We went over that phase energy has no temperature change and solid to liquid and liquid to gas are phase energies. Also that phase energy is also mΔHvap and mΔHfus Thermal energy has a temperature change and the equation is mcΔT=Q. On Tuesday, we started our soap project and I was in a group with Shannon, Mariah and Carly. We started by melting the soap base and when it was melted all the way we added in the scent and the food coloring we wanted. We then poured the melted soap into the molds. We left the molds for a day. On Wednesday, we took the soap out of the molds. We then wrapped the soap up in whatever we could find, to take them home. My group then discussed what we would do for our Evernote project, I did the product and the development part. On Thursday, we presented our Evernote project. I think it went well. We each did our part on google doc and I transferred all the work into Evernote. I thought the rest of the groups did a great job as well. I thought all the soaps turned out really well and the winners of the best soaps deserved it. On Friday, we did an ICS lab, which stands for ice cream social. This lab was suppose to show us a phase change water that was solid and we added salt. Salt will get in between the water particles and they will interrupt the attractions and it will melt the ice. For the LOL diagram Eth was 1  and Eph was 1; after Eth was barely 1 and Eph was 2. We learned that the freezing point depression is how you melt ice on driveways. We were trying to make ice/water to be below zero to freeze cream and make ice cream. We shook our bag for ten minutes and the ingredients in our bag mixed together and didn't turn into a complete solid. when we finally finished shaking our bag we got a vanilla milkshake. Mariah tried a little of it, but I didn't have time to try it. I hope it was good!

Blog Week 14

I was absent Monday, Tuesday and Wednesday this week. I reviewed the notes that were done in class and gathered some information. Mathematics of state changes △Hfus, the energy of melting and freezing and △Hvap, the energy of evaporating and condensing and boiling. I also learned what field is, it's the area around an object where a non-contacting force can be exerted. Energy can be stored in fields, electrostatic field are particle in chemistry. Eph is the energy stored in the "field" between particles. Eth is the movement of those particles. I learned that specific heat is the energy associated with one Celsius change in temperature for one gram of a substance. On Thursday, I was in class and we learned about heat of vaporization and fusion. Heat of vaporization, △Hvap, is liquid to gas and gas to liquid. The equation to find the amount of energy for heat of vaporization is Qvap=m△Hvap. It takes 2260J per gram for water. Heat of fusion, △Hfus, is solid to liquid and liquid to solid. The equation is Q=m△Hfus. It takes 334J per gram for water. Both heat of vaporization and fusion are part of phase energy. The thermal energy equation is Q=mc△T. On Friday, we took an assessment and it was pretty hard. I didn't know how to explain most of the questions and I was not prepared well enough. So, I will definitely be reassessing. 

Blog Week 13

On Monday, we talked about the assessment, we took on Friday. I got all most all of the questions right. On the first one I got the main idea, but forgot to talk about energy. The second question, I did wrong, I did not set the equation up right. It was suppose to be 2500=m(4.18)(70), the 70 came from 100-30, 100 is the temperature of boiling water and the water dropped 30 degrees Celsius. So, the answer came to m=8.54kg. The third question we were suppose to talk about both mass and temperature and use the equation Q=m△T. So I pulled in the first mass and temperature in: 25(100)=2500, then I did the second mass and temperature and got 50(50)=2500. They have the same amount of energy. On Tuesday, we learned about boiling and the bubbles that are formed. Boiling is gas diffusion, particles move faster and spread out, and then more energy is added. The bubbles are particles of water, just further apart from each other and the volume is expanded and the density decreased, which makes it them float. As the one bubbles state changes the others start to join. The types of state changes are condensation, ice melting and steam. The mathematics of state changes are Eph→ Q=mc△T, then Eph→△Hrus→Eph of melting or freezing, Eph→△Hvap→ condensation or evaporating. This picture below, shows the different state changes of water. 

On Wednesday, we had a shortened class. We learned that particle diagrams don't do a good job of representing the changes in energy. So we learned energy accounting. We recorded Thermal→Eth before and after and Phase→Eph before and after. Then we record which is bigger on a bar graphs before and after and if energy came into the system of left the system. This picture blow shows some examples. (sorry I don't know how to turn it around.) Eth, thermal energy is the motion or speed of particles. Eph, phase energy is the state of matter change, the arrangement or distance between particles. 


On Thursday, I was absent.
On Friday, I was also absent.