STEM

May 12, 2019

Motion & Distance

Can you give some examples of motions? But first of all, lets me give a simple definition of what motion is. Basically, Motion is the act, process of moving, or the change of position. Many many things around you are moving, which means it relates to the process of motion. For example, I ride my bike to my house, it means I am in motion.

Distance : Distance is the length of the route between two points, which are the starting and finishing line. The SI unit for distance is the meter.

(1 m = 3.28ft), ( 1 cm = 0.01 m), ( 1 km = 1000 m)

February 13, 2019February 13, 2019

STEM, Round 3

Carbon !!, Did you know that all living things contain carbon? It’s including you. Human contains 18% percent of carbon. Carbon is a nonmetallic element in the periodic table with the symbol of C. It has the atomic number of 6, which means it has 6 electrons and 4 valence electron. Valence electrons are the outer energy level of an atom.

Carbon Cycle

Carbon Cycle is the cycle of carbon between different living organism on earth and atmosphere, though some processes like photosynthesis, respiration, combustion, and decomposition. During photosynthesis, plants use the sunlight to produce its own food. In Respiration, they are doing the process the releasing gas to the atmosphere. In addition, Combustion is the process of burning fossil fuel. Meanwhile, decomposition is when the dead organisms are broken down by bacteria and fungi.

Our experiment

Ingredients: Baking soda, Sugar, alcohol, sand.

Equipment: Mathes, bowl, aluminum foil

Our experiment is about the Black Snake. First, we’ve put the sand in a bowl. Then, we put the mixture of baking soda and sugar into the bowl and pour some alcohol in some place around the

Bowl and fire the matches and throw into the bowl. Then, the result was that we could see the small black ash in that plate.

My opinion of this experiment

I think, during this process the carbon ash flote up because of the carbon dioxide trying to get out through the ash. It might cause some kind of reactions between sugar, sodium bicarbonate, and alcohol that create heat. According to the formula of these ingredients, one of them might lead to makes carbon dioxide gas which I think sodium bicarbonate has the highest chance (NaHCo3). And the pressure of the carbon dioxide gas pushes and create the black snakes.

November 29, 2018

STEM, Round 2

In the round two, we’ve started a new lesson from periodic table to chemical bonding. There are three types of bond which are ionic bonds, covalent bonds, metallic bonds. I will explain you to all of these concepts.

Chemical bonding

Chemical bonding is the attraction of elements combine together to from another chemical compound, which occurs when atoms share or transfer violent electrons. Violent electrons are the electron that locate in the outer energy level of an atom. For example: water is a chemical compound (H20). Water molecules always make up of two atoms of hydrogen and one atoms of oxygen.

Ionic bonds

Ionic bonds form when atoms of a metallic element give up electrons to atoms of a nonmetallic element. It is the force of attraction that holds positive and negative ions together. For example:Between sodium and chlorine. Sodium has 11 valence electrons and chlorine has 17 valence electrons. Sodium has 1 valence electron left so it gives to chlorine, the one who need 1 more valence electron to be stable.

Covalent bonds

A covalent bond is the force that holds two atoms together that they share each electrons. They form only between atoms of nonmetals which may be the same of different elements.

Metallic bonds

A metallic bond is the force between positive metal and the valence electrons that shares with other ions of the metal.

October 17, 2018October 24, 2018

This year, in STEM class we focus on Physical science, it seems interesting, isn’t it? Absolutely, that is true about Physical science. It is related to matter and energy which included chemistry and physic.

We’ve learned about matter, mass, physical and chemical property. Matter is defined as anything that has mass and volume. Mass is amount of matter in a substance or object which is commonly measure with the balance. Physical property is something that we can see, absorb, measure without change. Chemical property is the property of the matter that can be measure or absorb only when changing from and become something else.

We also learned about atom. In a small group, we did a research about neutron, electron and proton. The goal was to understand the content in order to make a teaching lesson to all the classmates. In my group, we had many activities about the lesson. I could know more about neutron, electron and proton. Proton is something that carry positive charge in an atom, electron is something that carry negative charge in an atom and neutron is something that carry no charge.