10th graders investigated physical and chemical changes in Ms. Gwendolyn Toro’s Chemistry class, experimenting with substances such as iron, sand, and sodium hydrogen carbonate.
Using hot plates, tongs, and beakers, students examined the properties of different materials, observed how they behaved under varying conditions, and applied scientific principles to interpret their findings.
The experience challenged students to think critically, analyze evidence, and draw informed conclusions, reinforcing the scientific reasoning and practical laboratory skills developed at SJS.
Saint John’s School is a non-profit, college preparatory, nonsectarian, coeducational day school founded in 1915. The school, located in a residential area of Condado, in San Juan, Puerto Rico, has an enrollment of over 800 students from Toddler to grade twelve. Instruction is mostly in English with the exception of language courses.