Chemistry 2A Week 3 Reveiw

On Monday, the class continued to review for the test that was originally supposed to be on Tuesday, but got changed to Wednesday. We white-boarded Unit 4-Describing Substance Objectives and reviewed items such as properties of matter. Pure substances are single elements or compounds. Elements are one or more of a single type of atom while compounds are two or more different types of atoms chemically bonded together. A mixture is a mix of different elements and/or compounds. Also, mixtures can be physically separated and a compound can only be separated by chemical means.
We reviewed Avogadro's Hypothesis on how two samples of gas at the same volume, temperature, and pressure contain the same number of molecules. The class revisited the Law of Definite Proportions and the law of Multiple Proportions. The Law of Definite proportions states a chemical compound always contains exactly the same proportion of elements by mass. The Law of Multiple Masses states when two elements combine with each other to form two or more compounds, the ratios of the masses of one element that combines with the fixed mass of the other are simple whole numbers.
The class also went over Dalton's model of the atom. Dalton's model states all matter must be composed of particles, and particles shape and motion depend on their state of matter.
Examples of white-boarded review

On Tuesday, we continued to review for the Unit 4 test. We completed Unit 4 Review and white-boarded it as a class. The biggest thing I needed to remember for the test was the diatomic elements. Dr. Finnan taught us the 7-Up trick and I remembered them.

Example of White-boarded review guide

On Wednesday we took the test. I am happy with my grade of 31/34. I am curious to know what I did wrong. I'll make sure I stop by after school to find out. After the test we got our Unit 5 objectives and Dr. Finnan explained how we would need to know them because they are important to the unit.

 

On Thursday we got new seats. I am excited to work with my new table mates. We completed the Relative Mass Activity and came to the conclusion that it is possible to count by weighing. However, there is a method to it. You first have to find the average weight of the object, like we did with the packing peanuts. You then find the weight of the container with the objects inside. After that you find the weight of just the container. Then you take the difference of the weight with the objects in the container, and just the container. This allows you to find the weight of just the objects. After finding this, you divide the weight of just the objects by the average you found earlier. This gives you the number of objects.

 

On Friday, class was shortened because of the pep rally. Since I was in band I had to leave early so I didn't complete any of Unit 5 Worksheet 1. I was informed by a fellow classmate that we didn't do much of it so I look forward to catching up on it on Monday.

I would also like to thank Dr. Finnan for collecting my ticket at Homecoming and I look forward to another great week in science.