## Long and Synthesis Division

After many months of SAT preparation and the first SAT exam was finished, our Math class tilts toward precalculus. We studied the function’s behavior, transformation, and shapes. Many times, we find zeros of polynomials through couple strategies such as Descartes’s rule of Signs, Upper and Lower Bounds for zero, list of possible zeros (factor of constant term/factor of leading coefficient), factoring and long division and synthetic division.

I found out that long division and synthetic division to solve for zeros is really essential, so I want to show how to use them.

1. Long Division

It looks almost the same with normal division we did in grade 2. However, complexity but the same element.

2.  Synthetic division

The same problem as above, the synthetic division has a different way but result in the same answer.

## Chemistry Molecular shape

As class progress, our chemistry knowledge is deeper. Each lesson builds upon each other. For instance, after learning the Lewis dot structures, we have gone farther about molecular bonding shape of a compound and its polarity.

## Chemistry Lab

Last year science was Physics. For this year science is Physics. We study over the fundamental concept in chemistry from atom to the periodic table. Besides learning from the slide and practices solving problems, we were doing a chemistry lab about Quantized Energy Levels in different compounds.

Here is my lab report:

1. Why do we see colors in the flame tests?
We see colors in the flame test because the electrons were getting excited when exposed to energy and jump to a higher level shell, then release a specific frequency proton while falling back to the original shell.
2. How will we be testing the substances qualitatively?
We will be testing the substances qualitatively by observing the color of the flame which the atom emitted.

Procedure:

1. Light the Bunsen burner (turn the gas on so you can just hear it, then use the striker)
2. Place the wood splint for each compound into the flame using tongs or tweezers- ONE AT A TIME!
3. Take note of the color of the flame and return the wood splint to the solution.
4. Carefully put the stoppers back on the solutions! Make sure the station looks like it did when you started! Let me know if you need new splints!
5. Wash your hands thoroughly before leaving the laboratory

Data Table:

# Compound

## Wavelengths of light (in Å) (quantitative)

Barium Chloride Green 560 – 520 nm
Calcium Chloride Orange 635 – 590 nm
Copper (II) Chloride Cyan 520 – 490 nm
Lithium Chloride Pink 700 – 635 nm
Potassium Chloride Purple 450 – 400 nm
Strontium Chloride Red 700 – 635 nm
Unknown #1 Pink 700 – 635 nm

# Discussion and Analysis:

1. What observation did you make that allowed you to come up with the wavelengths for each chemical? What happened to the atom (and more specifically the electrons) that caused you to see that change?

A color emitted by the compound has a specific light frequency and wavelength. The difference energy in which the electron in the ground and the excited states could be explained by the light photon that electrons released. The higher the frequency of the photon, the more quantized energy level is. For example, Potassium Chloride emitted purple photons which has a higher quantized energy level compare to Strongtium Chloride which emitted red that has lower quantized energy level.

1. The unknown compound is one of the other six. Identify it and explain HOW you figured it out using the results of your experiment.

When the color of the unknown compound emitted (pink) compare to the color of the known compound emitted, we see Lithium Chloride also emitted pink as well. So the unknown compound is Lithium Chloride.

Conclusion: What are two possible sources of error for this lab? How would the errors affect your lab? What would you do differently next time to counteract these errors?

Two possible sources of error for this lab are identifying the color of the flame incorrectly and using wood splint as the tool to hold the compound in the flame. The missed identify the color could result in false wavelength as well the quantized energy levels of the compound. The wood splint that held the compound in the flame, got burn and possibly emitted flame with a different color that could buffer us from identifying the color from the compound. To counteract these errors in the next time test, the procedure should include taking pictures of the flame and identifying its color by using computer software and replacing wood splint with a metal splint or a metal spoons instead.

## Preparing for SAT exam

As the SAT exam is approaching, in Math class I have been preparing and practicing taking the exams. In the math sections of the exam will cover algebra, equations, proportion, statistics and some geometry content. Most of the problems I could be able to solve them, however, due to the time limit I must solve the questions fast enough with accuracy. I will share one of the strategies we have been gone over to solve a specific type of questions: special pattern circles.

## AP Statistics and AP Computer Science A scores

Two more years till my graduation, I might attend a university oversea, therefore to prepare for university, I took two AP (Advanced Placement) courses, AP Statistics and AP Computer Science A. The courses are university-level course and they are extremely difficult. To prepare for AP exams on May, I studied statistics during Math class and part time in school prepare for AP computer science.

This is my score for the AP course:

AP Statistics: 4

AP Computer Science: 4

The final reported on 5-points scale as follow:

5 = extremely qualified

4 = well qualified

3 = qualified

2 = possible qualified

1 = no recommendation.

## My Khmer Poem

ចំណងជើង: ​ស្រណោះ

(បទព្រហ្មគតិ)

ស្រណោះស្រែវាល​ស្រូវ                ដែល​ធ្លាប់​នៅ​កាល​ពី​តូច

ស្រណោះចាប​យំ​​ហ៊ូច ​​​​​​​​​​​​                  សម្លេង​កួចពីរោះក្រៃ។

ស្រណោះ​ប្រឡាយស្រែ                ដែល​ធ្លាប់​ហែល​លេង​ភក់ដី

ស្រណោះកាលបង់ត្រី                   ធ្វើចំណីប្រឡាក់ដែរ។

ស្រណោះកាលឃ្វាលគោ              ជិះ​កង់​ហ៊ូ​ពេញវាលស្រែ

ស្រណាេះគ្រាប់​ស្រូវ​ផ្លែ                   ភ្ជួរ​រាស់​ដែរព្រោះចុង​ក្រោយ។

ស្រណេាះបរគោយន្ត                      អ្នក​មាន​គុណ​បង្ហាត់ឱ្យ

ស្រណោះម្អមស្រែអើយ                  មុន​នឹង​ក្រោយយកទៅ​ស្ល។

ស្រណោះព្រលិតបឹង                      ឈរឡើង​នឹងដូចសសរ

ស្រណោះឈូក​ប​​វរ                         ចិត្តស្មោះសរមិនភ្លេចភក់។

ស្រណោះដើមត្នោតទេរ                 អស់ឯងគេសរសើរ​ខ្ពស់

ស្រណោះរំពាក់លួស                     ញាំុផ្លែជួស​​ការ​អផ្សុក។

ស្រណោះស្មៅកន្ត្រើយ                  នៅ​មិន​ស្បើយនៅ​មិនសុខ

ស្រណោះត្រពាំង​ថ្លុក                      បក្សីកុកមករកត្រី។

ស្រណោះវាលបៃតង                     ជីវិត​ចងជាមេត្រី

ស្រណោះកាលតូចក្ដី                     សប្បាយក្រៃពេលឃើញស្រែ។

## Coming of Age Narrative Essay

The first unit of English Literacy was about writing a narrative essay relating to rite of passage. This writing is about one’s remarkable transition experience in their life. For example, becoming a teenager.

Now, I have become a teenager, though, this not what I wanted write about. I have an interesting story to tell which is the journey I walked toward my passion. Since, I was a child; I was fascinated to technology but my dream seemed to be just a dream until one life changing moment when I come to Liger

During in class, I also have learned new writing skills and techniques such as parallel structure, comma usage, anaphora and metaphor that I have implement in my writing.

I have spotlight some of my best parts:

“I decided to apply for Liger scholarship because the only one reason is that Liger has computer programs. My parents didn’t encourage me to apply. I cried like a baby begging for milk.”

“After a year, I even receive a brand new laptop for my learning. I felt that my computer was a new toy that Liger offered. It was such an honor to own it.”

“I asked myself, “What does this button do?” I was ended up clicking all buttons even I didn’t understand what they say.”

“I would say my life is like a game. After I complete a lower level, harder level introduce. Still, the knowledge about computer was not enough, and that is when my next level arrived: coding.”

“Coding is very tough, messy and advance. I faced a lot of frustration and stress, but there is a power that pushes me to keep doing coding. The power is self satisfaction.”

## Kinematic Equations

A firework goes flying up into the air from the ground and reaches a maximum height of 40m (and falls back down to the ground). What is the total time it stays in the air?

During, Physics class, we were introduced to kinematic equations and solving this kind of questions. This new concept is very useful to understand how objects moves, relevant to time, distance, accelerations and velocity.
With three essential equations:

$a&space;=&space;\frac{v_{f}-v_{i}}{t}$
$d&space;=&space;v_{avg}&space;\times&space;t$
$v_{avg}&space;=&space;\frac{\left&space;(&space;v_{f}&space;-&space;v_{i}\right)}{2}$

We can use algebra rules and formed into four kinematic equations:

$v_{f}&space;=&space;v_{i}&space;+&space;at$

$d&space;=&space;\left&space;(&space;\frac{v_{i}&space;+&space;v_{f}}{2}&space;\right&space;)&space;\times&space;t$

$d&space;=&space;v_{i}t&space;+\frac{1}{2}at^{2}$

$v_{f}^{2}&space;=&space;v_{i}^{2}&space;+&space;2ad$

In kinematic problems questions, we would need to use one of the equation to solve the problems.

## AP Statistics

Arthur Benjamin, an American mathematician quoted that

Teach statistics before calculus!

Most students, after they finished learning Algebra they will learn calculus but not statistic. Though, calculus only use in scientific researches but statistic is what most people would need in their daily life. People saw a lot of data, graphs, scatter plots in articles, documents or in news and statistic will teach you how to analyze them.

Now, I’m studying AP Statistics which is a college level course and I’m preparing for coming up exam. This course is very challenging due to many new and advanced vocabularies and it requires a lot of understanding and analyzing. However, learning about statistics changed my perspective, how I see data and examine about them if they were valid. Through analyzing and constructing bar graphs and scatter plot and I found out that it is actually fun.

We study based on The Practice of Statistics Textbook, AP statistics test book. Other than this, we learn and practice from many other online resource such as Khan Academy and other worksheets.

After finishing one chapter, we have to take a reviewing quiz before continue the next one.

Currently, we finished four chapters:

Chapter 1: Exploring Data

Chapter 2: The normal Distribution

Chapter 3: Examining Relationship

Chapter 4: More on Two-Variable Data