## STEM Round 4

In this round, I only got to learn about force. As I went on the Robotic trip, I missed this class for one week and I didn’t get to learn about Movement. Force is also related to movement, force is the energy or strength the cause of action. Movement caused by force. Let’s get to know more about gravity.

What is the traditional definition of gravity?

• In physics, gravity is the natural force that causes things to fall toward the earth.
• The force of attraction between all masses in the universe; especially the attraction of the earth’s mass for bodies near its surface
• Example of gravity. If you sitting on chair and looking at the sun set, you will still sitting on your chair because the gravity of the earth are pulling you down here. You won’t flooding round. The sun won’t pulling you up.
• It’s also related to distance. Example, if you are in the middle between earth and Mars. You will flooding to the planet that has stronger force that it’s gravity can pull you closer to it. Because you stay really close to earth that why the gravity of earth pull you down and you don’t flood round.

How is weight related to gravity?

Weight = gravity

Mass = matter

• Comparing weight the related to gravity is really confusing. Every planets are having different gravity. Example: You are 50 kg on earth but if you travel to Mars. Your weight will change. That because of gravity could change weight.

I really love STEM. After I learned in STEM class, I get to discover new thing with my every days life. Sometimes STEM is really hard. I had miss this class because I need to on trip. This round it’s kind of hard to catch up because the lesson are related to each other. We mostly learn every lesson from Ck12, so it’s make me easier for catch up the lesson that I had  missed.

## STEM Round 3

Carbon

All living thing contain carbon. Carbon is a chemical element with symbol C and atomic number 6. It is nonmetallic and tetravalent making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table.Carbon is a very common “ingredient” of matter. Carbon can combine with itself and with many other elements to form a great diversity of compounds. The compounds can also range in size from just a few atoms to thousands. There are millions of known carbon compounds. Carbon is the only element that can form so many different compounds. Six example of carbon are coal, chark, pencil, diamond, sugar and wood.

What is carbon cycle?

The series of processes of carbon compounds are inter-converted in the environment. As the involving of the picture below. Animal respiration, plant respiration, auto and factory emission, dead organisms, etc,  are contain carbon dioxide. They gone to the atmosphere, but tree doing photosynthesis and absorbs all those carbon dioxide. Tree produce oxygen for human. No tree, there will be global warming and no fresh air.

Black Snake

We also doing experiment about the black snake. We doing this to see how carbon turn to something interesting. We’ve been doing the experiment for two times, and we will see what is the different.

1st experiment:

• Two spoon of  sugar & sodium bicarbonate and mix them
• Put the sand in the bowl and surge the alcohol
• Put the mixed of sugar  & sodium bicarbonate in the bowl of sand
• And surge the alcohol again
• Then burn them
• After a few minutes we saw the carbon ash come out

Sugar turn into to the carbon ash.

sodium bicarbonate become carbon dioxide.

2nd experiment:

• 5g of baking soda
• 20g of sugar

This time we put more sugar that why it created more carbon ash.

## STEM Round 2

This term, in STEM class, I got to learn many things. We got to learn about periodic table, elements, alloy, chemical bonding, ionic bond, covalent bond, Polar and Nonpolar Covalent Bonds.

First of all we got to learn the history of Periodic table. Mendeleev is the one who organized the elements from left to right across each row, elements are arranged by increasing atomic mass. There are only 92 elements.

Now, In Periodic table, there are 118 elements, those new 26 elements were just add by some new scientist. In the modern periodic table, elements are organized by atomic number.There are 4 group in periodic table: alkali metals, alkaline earth metals, halogens and noble gases.

Group 1: Alkali Metals

All the elements in group 1 have just one valence electron, so they are highly reactive. The alkali metals are soft. Most are soft enough to cut with a knife. They are also low in density. Some of them even float on water. All are solids at room temperature. In Alkali Metals, there are lithium (Li), sodium (Na), potassium (K),rubidium (Rb), caesium (Cs), and francium (Fr).

Group 2: Alkaline earth metals

Alkaline earth metals, A group of chemical elements in the periodic table with similar properties: shiny, silvery-white, somewhat reactive at standard temperature and pressure. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Group 3: Halogens

The halogens are five non-metallic elements. Halogen means “salt-former”. The halogens are the only periodic table group containing elements in all three familiar states of matter (solid, liquid, and gas). The halogens are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

Group 4: Noble gases

Noble gases are all odorless, colorless, very low chemical reactivity. The six noble gases that occur naturally are helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn)

At Halloween day, we got to make the Pixar story by using Halloween characters with elements. Here is one of my Pixar story about Lithium.

Once upon a time, there was a fat ugly witch name Bablue who live in a tiny wood house in a deep jungle. Everyday Bablue always makes the poison. One day it was a big storm rainy day. Bablue can’t make her poison because the wind blows so hard and she can’t make fire. So she told her magic broom to find something that can replace fire.  After a few minutes later, her bloom came back with glass of oil with a silver rock. Then she put it in her poison. After a moment the poison was exploded and burned her hair. Because of that she turns on her computer and trying to research it. Then she saw an element name Lithium. She found out that Lithium is the chemical element with symbol Li of atomic number 3, a soft silver with the white inside like the rock that she just put into her poison at moment. It is the lightest of the alkali metals. They put them is oil because if we put them outside, it can be reacted. It’s reacted with water that why it burn her hair but if she put the just a little bit, it just boils her poison. Until finally she gets to know about it and trying to learn more about the elements.

What is alloy?

An alloy is a mixture of a metal with one or more other elements.

What is chemical bonding?

Chemical bonding, any of the interactions that account for the association of atoms into molecules, ions, crystals and other stable species that make up the familiar substances.

What is ionic bond?

Ionic bonds is the form between metals and nonmetals.

What is Covalent bond?

Covalent bonds are bonds in which atoms share rather than transfer electrons.

What is Polar Covalent Bonds?

Polar Covalent is covalent bonds, electrons are not shared equally between the two atoms.

What is Nonpolar Covalent Bonds?

Nonpolar is covalent bonds, electrons are shared equally.

## STEM Round 1

In Liger Leadership academy, we also have STEM class. This class is my most favorite class because I love science. The meaning of STEM are:

S : Science

T : Technology

E : Engineering

M : Math

Mostly this class were study about science. I have been learn this subject for two years. In this term, I have learned about physical science . This class mainly, we were learn from a website, that called CK-12 . We were started from learning about Mass and Atoms.

Here are some lesson that I have been learn for this term about Mass:

• Matter were made of mass and volume
• The unit of weight and newton
• Chemical poverty
• Physical poverty
• Mass and weight

The difference between Mass and weight:

• The unit of Newton and Kilogram:
• Newton is weight
• Kilogram is mass
• How to find is take the Kilogram time with 9.8 equal Newton

What I have learned about Atom:

• How Atom made out of
• Proton
• Neutron
• Electron
• Neutral
• Ion
• Quark
• Atomic number
• Atomic mass

Here are some examples:

• Types of Quark

• Atom

We are not just learn from the teacher or some websites but we also do some experiment about it. Doing experiment is really helpful for me to understand about my lesson because we are not just take notes and listen to the teacher but we take action to know more about it. Also after we finish doing experiment or research, we were share the information about our lesson to explain more about some part that we not really get to know to our classmate.