Iodine crystal

A solid, grey substance which sublimates when heated. Its solution in alcohol is called ´tincture of iodine´, it is a disinfectant.

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Hydrogen peroxide (H₂O₂)

The compound of hydrogen and oxygen. Colourless, odourless liquid; heavier than water.

Silver chloride (AgCl)

A white, crystalline compound that breaks down when affected by light.

Carbon dioxide (CO₂) (beginner)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Oxygen (O₂) (intermediate)

A colourless, odourless gas, an important component of the atmosphere, indispensable to...

Hydroxide ion (OH⁻)

A compound ion formed when a water molecule releases a proton.

Calcium carbonate (CaCO₃)

Limestone is a widely and diversely used material.

Phosphorus trichloride (PCl₃)

Colourless liquid that gives off smoke in moist air.

Hydronium ion (H₃O⁺)

The presence of hydronium ions relative to hydroxide ions determines a solution´s pH.

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