Test

We had a test the other day and I don't really know how I did on it! I'm hoping I did better than my quiz because I studied a lot.


 https://www.youtube.com/watch?v=XdVP9VsTOIU

Stoichiometry

Stoichiometry sounds like an intimidating topic, but the definition isn't as complicated as you might think. It is defined as, the process of using a chemical equation to calculate the relative masses of reactants and products involved in a reaction. The balanced equation for a chemical reaction describes the stoichiometry of the reaction. You always start off with what is given, and then you work your way to find what is needed. There are multiple ways to solve these problems, and I like using the magic number method. The video below will show you how to do it!

the magic number method

Quiz

We had a quiz the other day and I wasn't prepared for everything on it! I read over the chapter, but I think watching videos over the materials helps a lot more. Some of the questions I did the work and got the answer, but I would do something silly, like subtract my answers and pick the wrong one. Hopefully for the test I don't make silly mistakes, because at this point, every point counts.

crash course
the greatest song you will ever hear
mole ratio practice

Lab

We did a lab the other day to test the reactions between different chemicals. There were three liquids we mixed with solid to test if they had a chemical reaction or not. The solids were silver, copper, calcium magnesium, lead, and zinc. The liquids were water, copper (II) sulfate, and silver nitrate.  Calcium reacted with every liquid and was very active.

Chem Club

So after school, I went to go over my test and it happened to be the same day as chem club. They were making snow globes so I made one too! We dissolved benzoic acid in water, and then let it cool. It started to form unique looking "snow". I'm probably going to super glue something in the lid for a Christmas theme, so it's not an empty snow globe. It was pretty cool lab.

Test

We had our unit test today. I was running on one hour of sleep and a lot of caffeine. When I got to class, I felt pretty awake but I was jittery when I was taking the test. I was hearing a lot of people didn't get done on time so I tried not to spend too much time on problems I couldn't figure out. I did a lot of practice and was pretty confident I wouldn't fail, but now I'm not too sure! When we took notes on molecular and empirical formulas, I was a little confused. I watched some videos about how to solve some problems and it made a lot more sense. Overall, I feel like this sad piece of toast. 

How to find empirical formula

Hydrate

Anhydrous

chloride lab

In this experiment, we tried to find the compound of zinc chloride by measuring masses with the hydrochloric acid. It was cool to see the zinc dissolve and the chloride evaporate.

here's a selfie of me and frank that she doesn't know about

Lab

We had a lab the other day, and we were working with copper sulfide. When you heat this chemical, it changes from blue to white, eliminating the water in it. The masses change when heated. It wasn't the most exciting lab but I'm glad I got the opportunity to do it.

Quiz

The quiz we took the other day was not easy. It required a lot of math, and I got confused about how to set up some of the problems. Hopefully the test on Monday will be better than the quiz, but I got a lot of studying ahead of me.


here's a link to help with calculating formulas of hydrates
https://www.youtube.com/watch?v=KCuYQ3ayFNM

Test

Today we had our test over chapter 2 and 5. It wasn't that easy for me, but then again it never really is! It doesn't help that I fell asleep on my book while studying, but at least I got some sleep right? The test was over matter, sig figs, and dimensional analysis. There were some questions that I got confused on, but hopefully I didn't fail.

Scientific Notation

 In class the other day, we were taught ( or reminded) how to do scientific notation. I think it looks confusing, but once you do one, it's pretty easy. Lets say you have the number 0.0804. With this number, you would have to move the decimal to the right until there is one significant figure to the left of it. So you would move the decimal two spots over, in-between the 8 and the 0 to the right of it. So the new number would be 8.04. We times this number by ten because when you move the decimal over, you are multiplying it by 10 or -10. In this case, we are multiplying it by -10 since it is moving to the right. The scientific notation of this number would be 10 x 8.04 -2  ( the two is suppose to be an exponent) 

Matter Notes

Today in class we breezed by chapter two, talking about matter. Matter is anything that takes up space, and it comes in three forms, solid, liquid, and gas. Take water for example, to change it from a liquid to a gas, you would have to raise the temperature to do so. Raising the temperature also increases the kinetic energy.
          We also talked about physical properties, which can be observed without changing a substance into another substance. An example is boiling water, and the density of something.
          There is also chemical properties, which can only be observed when a substance is changed into another substance. An example of this is flammability.

Half Life

Half life is defined as the time it takes for a half of the sample to decay into a stable form. For example, if you start off with 100 grams of a sample, and the half life is two days, in two days you will have 50 grams, the next two you will have 25, and so on.
            We did a lab on half life, we had to figure out who the missing person was by figuring out how long they have been dead. For this experiment, we cut up little pieces of paper and then dumped them out from a cup. The one facing up we took out, they demonstrated the atoms that have been decayed in the first half life. Each half life took ten years; we repeated this six more times. With this information, we found out who was missing.

Radioactive Decay

There are three kinds of radioactive decay, Alpha decay, Beta decay, and Gamma decay. Alpha decay always has a helium nucleus, it has a mas number of four and an atomic mass of negative two. Beta decay is when a neutron changes into a proton, its mass number remains unchanged and its atomic number adds one. Gamma decay has no change in both its mass number and atomic number. It always accompanies alpha and beta decay. So even when a decay formula doesn't have gamma listed, we know it's there, it's just not implied.

Mass of Subatomic Particles

Today in class I learned about the mass of subatomic particles. Protons contain 1 amu, neutrons contain 1 amu, and electrons contain 1/1840 amu( amu stands for atomic mass unit). Protons are a part of the atom that gives an element its identity and mass. Electrons gives it reactivity, and neutrons give an element mass and isotope determination. Isotopes have the same number of protons but a different number of neutrons, and has different atomic masses even though it is the same element. When doing isotomic symbols, the mass number (A) is on top, atomic number (Z) is on bottom and the element symbol (X) is to the right of these number. This is what it looks like ( but its suppose to be centered).
AX 
Z

Different Scientist

We talked about different scientist and their views and theories on chemistry. JJ Thomson used a cathode ray tube to show the atoms of any element emit particles with a negative charge. Think about the chocolate chip cookie model! Rutherford's Gold foil experiment gave us protons, and proved presence of positive charge center in an atom. The current atomic model is a cloud model displaying electron location pinpointed using probability.   

Nomenclature #2

I learned how to tell if a compound is an acid. You have to look at the cation position, if the cation is a hydrogen, the compound is an acid. Acids are hydrogen ion producers, and all acids have H+. If it does not contain oxygen, it gets the prefix hyrdo. For example, HBr would be named as Hydrobromic acid. 

Nomenclature #1

I learned how to name different kinds of binary compounds in this unit of nomenclature. Type 1 contains a metal and nonmetal. The metal (cation) has a constant charge. Type 2 generally come from the d block, and don't give away the same amount of electrons. Use roman numerals to indicate the charge of the first element named. For example, CuCl would be named as copper(I) oxide. Type 3 are two nonmetals. You would use a prefix to indicate how many of the element. For example, PCl5 would be named as phosphorus pentachloride.

Introduction Page

My name is Kelly Schroeder and I'm a junior. I do cross country in the Fall, swimming in the Winter, track in the Spring, and summer running in the Summer. That takes up most of my time but aside from that, I'm a lifeguard. This is my first honors class, so I'm hoping I do good and pass the class.