Skip to main content

Using Dry Ice to Learn About Matter and Molecules


Second graders' study of chemistry promotes an understanding of matter and the molecules that it comprises. The hands-on unit includes several labs that address the properties of atoms and molecules, matter's three main states (solid, liquid, gas), and the difference between physical and chemical changes.

Building on their understanding of phase change, the boys recently had an exciting day of hands-on interaction with dry ice (solid Carbon Dioxide) in which they observed the process of sublimation (a solid going directly from a solid to gas state, bypassing the liquid phase.)


After their teacher dropped a chunk of dry ice in a beaker of warm water, the boys observed CO2 gas bubble up from the liquid like a thick white mist.  They then added dish washing soap to their beakers and were thrilled to scoop up the "misty" bubbles caused by the ongoing sublimation.


Finally, they were delighted when Mrs. Sundar, using a special canister with hose attachment, created a sublimation reaction by dipping the hose in bubble solution and directing the CO2 gas out of the hose.


In upcoming labs, the boys will engage in active investigations to learn about chemical changes.

These labs speak to the innate intellectual curiosity of our boys. Demonstrations, hands-on activities and experiments underpin the unit, which the boys count among their favorites!

Comments

Popular posts from this blog

An Evening With Lidia Bastianich

On Tuesday evening, Lidia Bastianich, award-winning chef, restaurateur, television host and author, visited Saint David's to speak to the Saint David's Alumni Parent community and current Eighth Grade.



Interviewed by Alumni Parent Dr. Joseph Haddad for our Alumni Parent Council Lecture, Lidia recounted her youth in Istria when the once Italian peninsula shifted to communist reign after World War II, her two years spent as a refugee in Trieste, and her experiences after her family immigrated to America when she was eleven years old.


The boys were fascinated with her discussion about her family's escape from Istria and her life as a refugee and immigrant. She expressed her everlasting gratitude to the people who provided assistance to her family in Trieste and when they first arrived in New York. "I can't talk enough about the goodness of the people who helped us," she said. "I am where I am because of them."

As a highly successful person with…

Navy SEAL Bill Berrien '82 Gives Chapel on Service to Saint David's Boys

Former Navy SEAL and Saint David's Alumnus Bill Berrien '82 fascinated all during his Chapel Talk Tuesday morning to our seventh and eighth graders.

A SEAL for nine years, Bill was a member of two platoons in South America as well as part of a Joint Special Operations unit. He shared his SEAL Trident with the boys, talked about the intensity of training, and noted he remains close to many with whom he served.


Connecting his service to the values that Saint David's espouses, he encouraged the boys to always be students--curious throughout their lives, to find the best in everyone, appreciate setbacks, and to learn from failures. In the video above, he addresses the first.

He closed by planting these "seeds" for our boys to consider: that life is a journey to be embraced broadly with openness to a variety of opportunities; being a service leader is of utmost importance; the unknown should be embraced; and, finally, that the boys be their own best friend, compassi…

Saint David's Father and Son Dinner Featuring Mark Whitaker

Our annual Seventh Grade father and son dinner provides the opportunity for seventh graders and their fathers to share an evening exploring what it means to be a good man, the relationship between parent and son, and other mission-related themes.

The speaker at this year's event was author, journalist and media executive Mark Whitaker, who spoke about his memoir My Long Trip Home, in which he delves into the story of his family, in particular, his father. The son of a bi-racial couple who wed in 1956 (a time when interracial marriages were still illegal in some states), Mark spent many years estranged from his father, a brilliant African Studies scholar who struggled throughout his life with alcoholism.


Later, they would reconcile, but it was only after his father had passed away that Mark realized he wanted to write a book about this man who had had a groundbreaking career despite all his problems, and try to understand him better. Ultimately, the process deepened Mark'…