Oxygen is a chemical element – a substance that consists of only one form of atom. Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight proton in that nucleus. Oxygen is a gas at room temperature and has no colour, smell or taste. Oxygen is found naturally together a molecule. Two oxygen atoms strongly bind in addition to a covalent double bond to kind dioxygen or O2.

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Ozone

Ozone is another type of pure oxygen. It creates in the earth’s stratosphere. Ultraviolet light (UV) splits O2 molecule into single oxygen atoms. The single oxygen atom latch ~ above O2 molecules to type O3 (the chemistry formula for ozone). The stratosphere has higher concentrations the O3 since there is much more UV present. The ozone layer filters the end UV, i m sorry reduces the chance to split O2 molecules in the lower atmosphere (troposphere), whereby we live. Ozone have the right to still kind in the troposphere once O2 is placed under high heat and also pressure. Vehicle engines have actually the right conditions to develop ozone, which is a toxin, so modern cars usage catalytic converters to transform O3 ago to O2.

Liquid oxygen and also solid oxygen

When oxygen is cooled to -183℃, it becomes a liquid. Liquid oxygen is provided as a propellant for rockets – consisting of the Rocket Lab’s Electron rocket. Oxygen becomes solid at temperatures below -218.79℃. In both that liquid and solid states, the substances space clear v a irradiate sky-blue colour.


Occurrence

Oxygen is everywhere!

that is the third most abundant element in the universe after hydrogen and also helium. The is the many abundant facet by fixed in the earth crust. Oxygen creates compounds v silicon and also other atom to form minerals like quartz and also sand. Oxygen also makes up most of Earth’s seas by mass. A water molecule (H2O) is consisted of of 2 hydrogen atoms and also one oxygen atom. Although there are more hydrogen atoms in water, hydrogen has less mass. By mass, water consists of virtually 90% oxygen. That is the many abundant facet in the human body (by mass) because our bodies room 70% water.

Oxygen means life

Oxygen is critical for life. Most living points use oxygen because that cellular respiration – the procedure by i beg your pardon cells attain energy. Humans and also other land animals breathe oxygen (as part of air) right into lungs. Right here it is took in into the blood and also carried to the body cells. Fish use gills to obtain dissolved oxygen native the water. Insects acquire their oxygen through tiny external openings dubbed spiracles, i beg your pardon lead right into a network of tubes dubbed trachea.

Plants also use oxygen for cellular respiration. In a separate process – photosynthesis – plants take it in carbon dioxide and give the end oxygen. In short light, the photosynthesis rate is much less than the respiration rate. In bright light, the photosynthesis price is higher than the respiration price and much more oxygen is developed than used. The excess oxygen is released right into the atmosphere.


Words we usage every day have the right to have different interpretations in science. ‘Respiration’ is commonly used to typical breathing – the inhalation and also exhalation that air. In biology, moving respiration refers to the chemistry reactions in cells that release energy from food. That is essential to talk about words favor respiration to prevent misconceptions. 


Combustion

Oxygen, by itself, does not burn, however it is important for combustion. Oxygen is one of the three components of the fire triangle. Fuel and heat space the various other two components. Heat produced by the fuel sustains the fire. As long as there is sufficient fuel and also oxygen, a fire will proceed to burn. Water-based fire extinguishers work by removing warm from the fire. Carbon dioxide and dry chemical extinguishers job-related by smothering the fire – cutting off the supply of oxygen.


Explore oxygen through these activities:

Explore the regular table of elements with these activities:

These articles administer background information about elements and how they space grouped:


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