Category: STEM

Every object has its own law like us human. In STEM class, we learned about Newton’s law of motion which includes First, Second and Third law of Newton. Newton’s First law of motion is also known as the law of  Inertia. Inertia is a tendency of an object to resist a change in its motion. For example, when you suddenly stop the car. The car will stop, but your body stills keep moving forward. Newton’s Second law is focusing on the factors which are acceleration and Net force.  Newton’s Third law force that reacts in pair when hitting each other. Other than that, we learned about Fluid Force which is focusing on pressure. To learn more about the pressure of fluids, we do an experiment of the egg into the bottle. We burned to create smoke and put it into the bottle and it creates heat so when we put the egg on the bottle, the pressure will pull the egg in. After that, we need to get the egg out of the bottle so we blow into the bottle. Once it contains full of air so the pressure inside will help the egg to come out of the bottle. People may think it is luck, but behind it is full of science.

PH is known as Acid and Base. The lower the number in PH scale is the higher the acid will be and higher the number in PH scale is the higher the base will be. The PH scale measure the number between 0 to 14. There are also acid and base that are inside human body so once the PH is unbalanced, it will cause many problems inside your body. To balance PH inside body, we need to eat more farm eggs(contain a lot of protein), gluten free grain(nuts & peanuts), refine sugar, etc and there are things that are inferior to  the body such as coconut oil, alcohol, black tea, chocolate, etc. If the PH is unbalanced, commonly there will be issue in the blood and can occur in bran, heart and lungs. Make sure your PH is balanced inside your body. Also, in class we have a experiment about PH testing that the Acid and Base mixed together.

 

Once the indicator pours into each liquid inside the glass, the result will the different color that can define acid, neutral or either base. The redder it is, the stronger the acid contains inside the glass. Then, it will become purple similar to the indicator as it seems in the neutral area and turn blue. If it has a stronger base, it will become yellow like when the indicator pours into the bleach.

• When the lemon and bleach mixed together, there nothing really happens because bleach has a stronger base. In the video, the lemon juice doesn’t completely resolve into the bleach.
• When the vinegar and baking soda mixed together, it’s starting to release Carbon Dioxide gas which makes it create many bubbles and explode which used in one of the volcano experiment.
• When the sprite and toothpaste solution pour together, there nothing really happen because it’s both weak acid and base. Once sprite and toothpaste mixed together, it creates a different color solution.

The global moment of carbon between the abiotic environment, including the ocean and organisms, is known as the carbon cycle. Most of everything on earth is made out of carbon.

Thursday is an experiment for STEM class, so we did the black snake experiment. This is the formula of the black snake experiment:

• 20 gram of sugar
• One bowl of sand
• 5 gram of baking soda
• Some alcohol
• A beaker
• A lighter or match

The step to making:

• First, put a full bowl of sand and wet it with alcohol
• Second, mixed sugar and baking soda together in a beaker
• Then, pour sugar and baking sugar out of the beaker and pour it in the middle of the sand
• Finally, fire it with a lighter or match to make it burn and you will see the result

This is the second term of learning Physical science is about the three bonding. They are Covalent bond, ionic bond and metallic bond. It seems that the name is really different to each other, but the explanation is similar. Ionic bond is a bond that one element give give the electrons to other element. For example, Sodium gives its electron to Chlorine. Covalent bond is a bond that  elements share each other electrons. For instance, Oxygen share electrons with other Oxygen element. Metallic bond is a bond that one element shared electron with other element. For example, Copper and Silver.

In STEM, we are focusing on one theme which is Physical Science. Now, we are learning about matter. How matters are made and different kind of matter. One things that make up matter is atom. For the last two week of this term, we are learning and researching about atom and what create atom. We knew that atom is the particle that can’t with our naked eyes, but there are quarks that create neutrons and protons inside the atom. Scientist found out that quarks is smallest particle that they have found. There are should be smaller particle than quark, but this the only things we know for now. This lesson is new and make more ideas for our Cambodian students in Liger including me.