1. This week I was able to get a sponsor for MHS Choir. I finished my planning and started paragraph one of my essay for English. I also didn’t miss a single practice this week.
2. Recently I have learned about the mole in chemistry and have started learning stoichiometry.
3. Next week I plan on having my glog ready on time, to turn it in. I plan on completing my essay on Great Expectations by Charles Dickens, by Friday.
1. Last week I completed on memorizing most of our concert songs for choir. I went to the orthodontist, to find out my teeth are doing great. And i managed to get through another week of school.
2. Recently I learned that when lifting weights, don’t ever lift with the wrong technique, my lower back has been killing me!
3. This coming week I was planning on starting my essay for English and watching the new movie Bad Grandpa by the end of the week or go to the football game.
Aah The Mole, not the mole that burrows in the ground, but the mole in science! A mole is a unit of measurement used in chemistry that is exactly 6.02×10^23. The mole was first thought of by Avogadro (an Italian chemist) and represents the number of molecules in a substance. After working with the mole in class the past couple of days, its surprising how big a mole actually is. A fun fact that helped me realize the enormity was, if a mole of pennies were divided up and given to every person on the earth, each person receiving 1.5×10^14 pennies. Personal spending at a rate of one million dollars a day would use up a persons wealth in just over two thousand seven hundred years. It would be nice never running out of money as long as you live but the earth would be covered in copper pennies to a depth of 420 meters. Hard to believe a mole is that big huh? But the mole helps to calculate the amount of smaller particles such as atoms. Not only that, but since the mole is consistent it helps when converting from atoms or molecules to grams. Common sense when talking about the mole is, a mole of one thing is the same as a mole of another. 
Today I get to be the teacher, and I am going to teach you all about percent composition. Percent composition is a process where a sample of a material is analyzed by its composition. You can find the percentage of the mass of a compound that comes from each of the elements in a compound by using a simple equation. The equation is: percent of element= (number of atoms)(atomic weight) divided by FW of the compound x100.
The picture is a better visualization of what I wrote above.
An example of when you would use percent composition, is lets say, your trying to find the percent/amount of carbon in ethane. The formula for ethane is C2H6. You find the atomic mass of carbon, which is 12 and the atomic mass of hydrogen, which is 1. Then you know you have two carbons and six hydrogen’s by the subscripts. You add the two masses together, 2(12)+6(1) and it totals to 30. So your total mass of ethane is 30g. Now since you want to know just the percent of carbon, this is where percent composition comes in. Essentially percent composition is part over whole x100. The part we want is carbon and that is 24.0g and we know our whole is 30g. 24/30=0.8 and you multiply that times 100 and get 80. We now know that ethane is 80% carbon. Pretty easy right?
1. This week I have completed selling my car wash tickets for my fundraiser in choir. I have also succeeded in giving my mom exactly what she wanted for her birthday. I completed a long test in English over 31 chapters in the book, and I feel very confident on how I did.
2. This week I have learned or more like reviewed on punctuation in English, there was a couple that I didn’t remember so it definitely helped going over them again. In choir I learned how to sing out more and improved on knowing how to read what key your singing in. I learned about significant digits in chemistry and how to convert measurements, not the easiest thing in the world.
3. This coming week I plan on retaking my quiz in chemistry. I plan on studying and doing well on my vocabulary test in English. I plan on having a good week overall and try to go without stressing myself out. Definitely want to get into pink week spirit for school and support the guys at the football game on Thursday!
In science you are constantly working with numbers, whether its the amount of a substance needed or calculating your results. Because of this we use something called Significant digits. You might be asking, What is significant digits? Well significant digits is any digit of a number that is known with certainty. Significant digits are used for accuracy and precision, when dealing with numbers. Very straight forward because we are looking for the most accurate and precise of answers.
So, whats so big about significant digits? Just think about it, scientists needed to be as close as possible when they were studying about the elements. For example, when they were trying to figure out the correct atomic weight. We wouldn’t want some of the biggest foundations or discoveries to be merely a guess, we want to get as close as possible to the right amount of anything. Using significant figures is also easier when doing calculations, such as 1 mole= 6.02×10^23 is much simpler to write, instead of 1 mole=602000000000000000000000. Thank goodness for significant figures!
Chemistry 