Matter and Measurement Test

After the measurement quiz, I studied hard and tried to understand Significant figures. I understood it better but significant figures mixed with conversion was difficult. I had trouble with some problems. I figured them out but I am not 100% sure I got them all right. I am hoping that I did really good. The conversions were difficult because they were a lot of work and a little miscalculation will cause the entire problem to be messed up.

Mole day

We had a party in chemistry on Mole Day. we had to make a mole and I was baffled by the amount of creative ideas that people came up with. There was a wack-a-mole, mole dancer, guacamoley, holy-moley , and many more. It was pretty impressive. My mole was molezilla, but his name is steven. It was a good party and work day.

Matter lab

This lab was more of an activity to strengthen our understanding of matter and physical and chemical changes that take place in matter. Some stations had questions we had to answer whether the change was a chemical change or physical change. Other stations contained substances that had things in common and we had to determine what type of substances they were. This activity helped us understand matter.

Matter and Measurement pre-test

We took a pre-test last week and I did not know much about the topic. I didn't understand what significant figures means and did not know some physical and chemical properties. The test was difficult and that would explain why I got a 51% on the pre-test.

Video on Density
Video on Conversions and Significant Figures
Dimensional Analysis
States of Matter
Homogeneous and Heterogeneous 
Classification of Materials

Significant figures

Significant figures was an easy lesson but there are many places to get a question wrong.We have to remember these rules if we want to get a good grade on this test and on future tests because I am sure that this topic will come up in the future multiple times. The rules are:
1. Non-zero digits are always significant
This means that any number besides 0 is significant. ex- 8, 9, 28, 276 etc.

2. Any zeros between two significant digits are significant.
This means that if a zero falls between two non-zero numbers it is significant.  ex. 2002, .200003, 1000000000004 etc. all the zeros in these numbers are significant.

3. A final zero or trailing zeros in the decimal portion ONLY are significant.
This means that zeros after a number that is a decimal are significant. ex. 1.2000000, 10.348500, 0.005000 etc.

Forensic Archeology Lab

This lab reminded me a lot about what we recently did in Human body systems. In this lab we had to use radioactive dating to determine the age of a skeleton. In HBS we had to find out who the person is using the information given. I enjoyed the concept of the lab but didn't enjoy cutting the pieces of the paper out. It was very tedious. Using the formula and information given we were able to determine how old the bones approximately are and who it was.\

Unit Test

We had our Unit test over Atomic structure and Radioactivity. There weren't many difficult questions but there were some that were time consuming. I knew how to answer every question. If i get something wrong then it was because I didn't work it out correctly. I feel like I got a very good grade on this test,. This unit was pretty interesting but it was harder than the last unit.

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