Caesium reacting with water (4 of 5)

Caesium reacting with water (4 of 5)

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Caption: Caesium reacting with water (4 of 5). Caesium (Cs) is an highly-reactive alkali metal element that reacts violently with water to produce the strong base caesium hydroxide, also releasing hydrogen gas. The caesium sinks and (see other images in this sequence) generates hydrogen gas so rapidly that shock waves form in the water. The heat of the reaction boils some of the water into steam. The indicator phenolphthalein was added to the water to highlight the reaction, as it turns from colourless to pink in the presence of the alkaline caesium hydroxide. This image is a still taken from a high speed film shot at 2000 frames per second.

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Keywords: alkali metal, boiling, caesium, caesium hydroxide, chemical, chemistry, element, experiment, exploding, explosive, high-speed photography, hydrogen gas, indicator, metal, periodic table, phenolphthalein, physical, physics, pink, rb, reacting, reaction, reactive, slo mo, slo-mo, slow motion, slowed down, steam, tank, unstable, vapor, vapour, water

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