Category: Stem

This is finally our last round! As we switch the course with STEM and Technology every week, We also have 3-4 weeks together. There are also trips happening in every single moth, we consider this round as a very short and busy term.  I felt very relax this round, since I could go to every single in each week ( last round, I go to Technovation instead so I missed 50% of the class hour ). classes meant a lot to me. I do not want to miss any class, but at the same time, the other project also important. Anyway, I am 100% in the class now!!. We learned about Newton’s law of motion, fluid force and simple machine. It was a little bit frustrated at first, because there any so many types of Newton law ( well, three is a lot to me…). However, guess what? We did it. In order to understand the lesson, we also did some experiment as well. As always, we would go into groups and discuss what we want to show the other classmates to understand more about what we just learn. Even Though it is hard, but in the last week of the round, we learn about simple machine. I love simple machine. Both lesson and the topic itself. I don’t why I love them, but the thing I know is I’m obsessed with it. Maybe because it helps human to work easier? Many it is useful and creative? Well, in any reason I still like it. We also did some product for showcasing how would simple machine work. So, I did something with the Pulley. There are the steps that we did:

• Find a grave wheel
• Three long sticks
• 2 meters of string
• Connect the stick with the wheel, making sure it still can rotate and good for hanging somewhere
• Put the string on the wheel.  
• And… there you go!

If you are interested in STEM projects, you can read more about my another project that I’ve been working on this year here:

Stem engineering

https://www.instructables.com/member/Liger%20STEMgineering/instructables/

Have you ever thought about heavy objects dropped before the lighter one? I always think about that. However, you’re wrong. All of the objects will always drop the floor on the same time no matter how heavy it is. You can go and experience it now! Be mindful that, if you use the paper and leave, it might not accurate, because the wind might blow it. Use something that is strong than the wind. Example, pen Vs scissors, books Vs rock, wood Vs books. Saying this, make me think about motion. You know what? You need to use motion in order to drop and pick up those stuff using force.  A move you make is a motion. Raising up your hand, stepping forward, dropping objects. On the other hand, if you want to move stuff, you will need both motion to interact with force. The force are the pull or push that you applied over an object to be able to move it with your motion. Did you get it? If you don’t understand, feel free to comment!

Now let’s get into solution. Solution is formed by a mixture of two different substances.  The substance that dissolves is called the solute. The substance it dissolves in is called the solvent. For example, salty water is a solution in which the solute is salt and the solvent is water.

Acid and bases. Acid is An acid is an ionic compound that produces positive hydrogen ions (H+) when dissolved in water. Base is an ionic compound that produces negative ion when dissolved in water. We need to balance the acid and bases in our body, so we can be neutral. We don’t want to get too high acid or bases, because it can burn our stomach or poison our stomach. We can measure those two by using indicator, that will tell you the amount of acid or bases that are in your body through pH scale. The scale is from 0 – 14. The lower acid it is, the higher bases it is too. The high acid is 0. The high base is 14. Our stomach is good balanced at 7.3. However, our stomach can handle up to 2pH for acid. Lemon have the highest acid that we can handle. So, we probably don’t want to eat too much of them!! 

• Sour things = acid
• Bitter things = bases

Carbon is virtually important molecule in carbon cycle. It helps to create a lot of things that we need in order to survive such as, protein, fats, nucleic acids, lipids and carbohydrates. There are approximately 0.04% of carbon dioxide (CO2) in the atmosphere. It is a big number right?, compare to whole amount of people in the universe. I don’t know this before, it was quite interesting to me. When I started learning this lesson, I know that carbon are also present in ocean and freshwater as by dissolved carbon dioxide. One interesting thing is that, carbon is also present in the limestone! ( CaCo3). I used think that carbon are really bad for our environment, don’t you? In fact, it helps a lot. Carbon helps the tree do photosynthesis. When trees do photosynthesis, we all can have oxygen which is one of the thing that we must have so, when ever the sun comes out, the plants and trees will do the photosynthesis. Do you the process of photosynthesis? Well, they always absorb carbon in the day time and release it at the night time. However, have you ever imagine our life without carbon? I thought it would be good if it extinct, but sadly it was not what i thought. When they extinct, these are the disadvantages.

• Not enough carbon to do photosynthesis
• A lot of dead stuff, so smell not good
• No oxygen/ no photosynthesis
• More waste are building up
• You could have disease

A large topic in this term that I’ve learned is about chemical bonding. Chemical bonding are so important for the elements to be stable for creating new matters. There are three types of chemical bonding. They are considered as, covalent bonding, ionic bonding and metallic bonding.

Covalent bond. Covalent bond occurs when two of the nonmetal elements share electrons equally to be stable. There are three types of covalent bond which are single bond, double bond and triple bond. Single bond only share one electron  each. As an example of Hydrogen and Hydrogen. They both share one electron to have 2 complete inner shell electron. The double bond, they share two electron each. As an example of Oxygen and Oxygen. They each need to share 2 of their electron to have full shell as 8. The last bond is triple bond. It occurs when 2 elements need to share 3 electrons each. As an example of Nitrogen and Nitrogen. They both need to share 3 electrons to have full shell as 7. All of the three types of bond, are called Non Polar covalent bond.  In another case, if there are two different element wanted to share their electron, the one that have more amount will get more electron. This is called a Polar Covalent bond. One fact about about Covalent bonding is, it stronger than ionic bonding!

Ionic bonding is when a metal element transform the electrons to a non metal element. There is two names for ion. They are cation and anion. The cation is when an element gives out its electron so they can get more protons and be stable. Anion is when an element receive electron from cation and then they can have stable negative charge.

Metallic bonding is when the element that are metal attract with the same metal element and then form a stronger metal that are hard to be rusted. This means, the things that form by metallic bonding, is not easy to be rusted or break. On example is steel. Steel is very strong and not rusted easier, because it form from metallic bonding.

this some of the highlights from this round