Category: Stem

+ Ingredients:

• Baking soda  
• Sugar
• Sand
• Alcohol
• lighter/etc that can make fire…
• zippo lighter fluid(we  didn’t use it actually, but it is fine if you use it) 

+ Instruction:

          First, we have a ratio of baking soda and sugar is 1 to 4. Mix the baking soda and sugar together then. We do need a cup of sand and first of all, we have to put the alcohol all over the sand and next, we will have to put the mixture of baking soda and sugar as a mount on the sand. After that, we should put some more alcohol on the mixture of baking soda and sugar. Lastly, we have to light up on the sand that fills with alcohol and the chemical reaction will happen.

+ Reaction report:

          After we burn it for a few seconds, we will see some black things growing up and making some kind of smell(the smell isn’t bad!). The black things or we can call it fire snake started to grow slowly and taller.

+ After reaction:

          We took that fire snake and it was almost like some kind of dust, but it is harder then dust. We can hold it and it was big and my hands become black after touching the fire snake.

+ How did that happen in my opinion?

          When the mixture of baking soda and sugar burn, the baking soda gets hot and it will release carbon dioxide gas. The pressure from the CO² gas will pushes and form the black thing or fire snake.

 

This round in STEM class, we have been doing a lot of experiments during the class. One of the experiment that I love and I wanted to share with you is putting mentos into coke. I usually see them tasting and doing this experiment in youtube, but during this class I can see how it work and see it in my eyes clearly. I never think that chemical reaction is realy, but after I’d learn STEM for entier of hours, I can change of lot of things that I thought crazily before and making a real process of understanding of science work.  

In the Liger Leadership Academy, there is an essential that focus on Science, Technology, Engineering, and Math(STEM). In this round, Junior students have been working on the periodic table in STEM class and I am so excited to learn with those interesting lesson and understanding how elements work scientifically. 

Periodic table 

Periodic table was a really interesting topic for me to learn and I feel really passionate about this lesson as my facilitator have explain and did some experiments during this class. For this topic, I can also catch up the lesson quickly because all of the content are so excited for me. In the periodic table we have been learning about its group and period and the history of the periodic table including the purpose of making the periodic table. Periodic table are so hard to organize, but when we know how it work it will be really easy for us to understand the periodic table. Dmitri Mendeleev was a teacher Russian as well as a chemist and Mendeleev has been creating a chemistry textbook and he was having a problems with organizing elements and he needed a way to organized the elements to make the students easier to learn about chemistry. By 1860s, Mendeleev has made a set of card that have the name of the elements, atomic mass and known properties. He arranged and arranged the card in many different ways and finally he found it when he placed the elements in order by atomic mass. Elements in the periodic table are organized by its atomic number now, because during the 1860s, scientist cannot recognize the atomic number of elements, but they can recognize the atomic mass of an element.