jilomove.blogg.se - Liquid nitrogen and water

For more information about this demonstration and others like it, see the article, The Wonderful world of Chemistry: A Magic Show, published in the May 2022 issue of Chemistry Solutions.Only complete this demonstration in a well-ventilated area, or outdoors.

A large amount of nitrogen gas is formed during this demonstration, which can displace oxygen, therefore this demonstration should not be performed in a small, confined area.Use caution when handling boiling water and liquid nitrogen, they can cause burns.Hot plates should be turned off and unplugged as soon as they are no longer needed. Exercise caution when using a heat source.Safety goggles and a lab apron are required. Students should wear proper safety gear during chemistry demonstrations.Always wear safety goggles when handling chemicals in the lab.Container for the liquid nitrogen (~10 L, we used a small trash bin).Heat source/Hot plate for heating water.*Amounts have been reduced for a smaller-scale classroom demonstration. This demonstration supports students’ understanding of: Interpret their observations from the demonstration to explain what happened.Describe how the behavior of particles changes based on the state of matter.Understand the relationship between temperature and phase changes.Constructing Explanations and Designing Solutionsīy the end of this demonstration, students should be able to:.

HS-PS3-2: Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as a combination of energy associated with the motions of particles (objects) and energy associated with the relative positions of particles (objects).

MS-PS1-4: Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed.

This demonstration will help prepare your students to meet the performance expectations in the following standards: This causes the liquid nitrogen to quickly evaporate and appear cloud-like as water vapor in the air condenses on the cold gaseous nitrogen. In this demonstration, students will observe boiling water added to liquid nitrogen.