Science Notes Posts


The nitrogen triiodide demonstration produces a loud sound and a cloud of purple vapor.
The nitrogen triiodide chemistry demonstration is a dramatic explosive reaction that produces sound and colored vapor. Crystals of iodine react with concentrated ammonia to precipitate nitrogen triiodide (NI3). The NI3 is then filtered out. When dry, the compound is so unstable that the slightest contact causes it to decompose into […]

How to Perform the Nitrogen Triiodide Chemistry Demonstration   Recently updated !



These pH paper test strips were made using paper coffee filters that had been cut up into strips and dipped in red cabbage juice. The strips can be used to test the pH of common household chemicals.
It’s easy to make non-toxic pH paper test strips from red cabbage juice. This is a fun project for kids to do at home. If you calibrate the test strips, they are useful for a school lab. What You Need Basically, all you need is a red or purple cabbage, […]

How to Make Red Cabbage pH Paper   Recently updated !


Protons and electrons stick to each other as much as they can, but kinetic energy and quantum mechanics keep them from holding still.
Protons and electrons are attracted to each other because the positive electric charge of the proton is attracted to the negative charge of the electron. But, if they two particles find each other so attractive, why don’t protons and electrons stick together? Orbits and Waves In a sense, protons and […]

Why Don’t Protons Stick to Electrons?


In addition to the prestige of winning an event at the Olympics, the victor receives a gold medal. At one time, Olympic gold medals were real solid gold. However, the last time a solid gold medal was awarded was at the 1912 Stockholm Olympics. Modern Olympic gold medals are sterling […]

Are Olympic Gold Medals Real Gold?





Astronomers believe it's possible for a moon to have a moon of its own.
We all know planets orbit stars and moons orbit planets. Have you ever wondered whether a moon can have a moon of its own (a submoon)? Theoretically, the answer is yes, but there is a good reason why we haven’t discovered any submoons around moons in our own solar system. […]

Can a Moon Have a Moon?



The average distance between the Earth and the Sun is about 93 million miles. (NASA)
All of the planets, comets, and asteroids in the solar system orbit the Sun. The average distance between the Earth and the Sun is 92,955,807 miles (149,597,870 km). Most people just round it up to 93 million miles. This distance is called an astronomical unit or AU and is used […]

How Far Is the Sun From Earth?