Dry Ice Recipes – Cool Halloween Science

Halloween is the perfect time for oozing, bubbling, eye-catching science! If you love to perform science demonstrations, Halloween is a wonderful excuse to fill the cooler with dry ice and get ready for a day filled with “ooze” and ahhhs! Great Halloween Science! Continue reading

Freezing by Boiling Demo – Flinn Scientific

The boiling point of a liquid depends on the external air pressure. When water is placed under vacuum, the boiling point decreases and the water boils. Boiling, however, is an endothermic process—as the water boils, the temperature decreases, and the water soon freezes!

In this demo, pressure changes cause a sample of acetone freezes while still boiling.

Click here for the complete instructions, courtesy of Flinn Scientific 

The Dripper

Hand print

Many children can identify that water exists in 3 states within our natural environment. Understanding that it is the very same water that undergoes changes of state presents far more of a challenge to children in grade 2. The following experiment is simple yet effective in helping children understand changes in state and a rudimentary understanding of the water cycle.

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Ice, Water and Vapour

Rainy cloud

There are three main states of matter – solids, liquids, and gases. Each of these states is also known as a phase. Materials can move from one phase to another when physical forces are present. One example of those forces is temperature. The phase or state of matter can change when the temperature changes. Changes of state are energy dependent; they are the product of how particles are interacting with each other. Temperature and pressure affect the way particles interact to change a state or phase. Increase the temperature (a measure of the average speed of particles in an object) and you increase the speed or disorganization of the particles in the object and get a change of state. Increase the pressure and you increase the organization of the particles in the object of study and you get a change of state. These changes of state are a fundamental property of the material. Generally, as the temperature rises, matter moves to a more active state.

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