Water (H₂O)

Water (H₂O)

Water is a very stable compound of hydrogen and oxygen, vital for all known forms of life. In nature it occurs in liquid, solid and gaseous state.

Chemija

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Susiję elementai

Vaizdai

Susiję elementai

Melting and freezing

During freezing hydrogen bonds are formed between water molecules resulting in a crystal structure.

Hydronium ion (H₃O⁺)

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

Hydroxide ion (OH⁻)

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

Phase transitions

A phase transition is the change of a substance from one state of matter to another.

Carbonic acid (H₂CO₃)

Colourless, odourless liquid produced by dissolving carbon dioxide in water.

Continents and oceans

Dry land on the surface of Earth is divided into continents which are separated by oceans.

Evaporation and boiling

What happens in a liquid during evaporation and boiling? What does its boiling point depend on?

How does it work? - Hair dryer

This animation demonstrates the structure and operation of hair dryers.

How does it work? - Microwave oven

This animation demonstrates how microwave ovens work.

Hydrogen peroxide (H₂O₂)

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

Hydrogen sulphide (H₂S)

A colourless, toxic gas with the characteristic odour of rotten eggs. It occurs in certain mineral waters and spring waters.

Layers of the ocean

Physical properties, as well as the flora and fauna of the ocean change with depth.

Molecule exercise II (Polarity)

An exercise about the polarity of molecules.

Nitrogen (N₂) (intermediate)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Ocean currents

The Great ocean conveyor is a planet-wide system of ocean currents, which has a great influence on the Earth´s climate.

Photosynthesis (basic)

Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.

Seafloor map

The boundaries of tectonic plates can be seen on the seafloor.

Seas and bays

This animation demonstrates the most important seas and bays.

Surface tension

Surface tension is the property of a liquid that allows it to obtain the smallest surface area possible.

The science of candles

Candles have been used for lighting since ancient times.

The water cycle (intermediate)

Water on Earth is in a continuous state of change. The water cycle includes processes such as evaporation, precipitation, melting and freezing.

Dissolution of hydrogen chloride (HCl) in water

The solution of hydrogen chloride in water is called hydrochloric acid.

Hydrogen (H₂)

Colourless, odourless, lighter-than-air gas. The most common chemical element in the universe.

Oxygen (O₂) (intermediate)

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

Reaction of hydrogen with oxygen

Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.

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