what is co2? what is it air,helium?

Answer 1

Carbon Dioxide. Like humans, fish breath in oxygen and breath out carbon dioxide.

Answer 2

I don't know what you are looking for here. I have seen many good answers that have been put down (some dumb ones too). CO2 a/k/a Carbon Dioxide is a molecule that is found in the air, mostly. The air as you know it, has many different types of molecule gases as explained by others. Carbon Dioxide when found in the air or shall we say atmosphere, is a gas. In a fish tank, I am assuming you are referring to fish, because of the category you choose, it acts the same in water as it does in air. (It is still a gas, whether in water or in the atmosphere, respectfully).

Helium as most of us know it is a gas, also. Helium has nothing to do with CO2. They are not related as atoms go. Helium is a lighter element in weight compared to most of the gases that are in the atmosphere, that is why a balloon floats when filled with helium.

There are ways to make CO2 a liquid, but that would really confuse things here.

So to really answer your question, CO2 isn't air or helium. It is a gas, mostly. (please do not get gas confused with gasoline that you put in your car, big difference when referring to free floating molecules)

Good Luck and Take Care

Answer 3

CO2 is what you breath out called Carbon Dioxide Air is made up of 20% Oxygen and 80% Nitrogen. Nitrogen is an inert gas Helium is He on the periodic table of the elements and is lighter than air. That is why it is used in balloons so they float. Actually in Scuba diving the nitrogen in air is sometimes replaced with helium(also an inert gas) to prevent a dangerous syndrome called nitrogen narcosis. Cased by nitrogen in your blood at depth. (not to be confused with the bends)

Answer 4

Air is a mixture of gases, mainly nitrogen, oxygen and some carbon dioxide. but there are rare gases too in air. Let's work back a little...there are three forms of matter, solid such as wood, liquids such as water and gas such as oxygen. The state of materials is related to the speed of their atoms or molecules so solids such as iron, the molecules move slowly or really vibrate, in liquid they move faster and gases move the fastest of all and occupy a greater volume. The atmosphere is made of these gases. Hydrogen is chemically active and bonds quickly or two atoms of hydrogen form a molecule but remain as a gas. Helium is a very stable but light element. It doesn't naturally form compounds and is lighter than oxygen and nitrogen and therefore causes a balloon to rise. Carbon dioxide is a waste product of normal respiration but is utilized by plants in photosynthesis to create sugars. Carbon dioxide is also used as a stimulus by the body to trigger breathing. It is a gas at normal conditions but is easily formed into a solid and is one of the few substances that pass from a solid to a gaseous state without becoming a liquid. Iodine is another. The atmosphere today also has a demonstrable amount of sulfur dioxide SO2 which is the result of smelting and other industrial processes. It also contains CO carbon monoxide which is from incomplete combustion fo fossil fuels. Rare gases in the air include Helium, Neon, Argon, Krypton, Xenon and Radon and require special equipment to collect them...only about 1% of the air is made of them, but we use them in creating 'neon' lights and by mixing them we can create many colors. We do use helium for deep water recovery operation and a mixture called 'helox' is used to prevent the toxic effects of nitrogen or nitrogen narcosis. It is less absorbable by the tissue. Decompression is just the same, to allow the helox mix to leave the tissue. If you were in a helox mixture, your voice would sound strange as the weight of the nitrogen and oxygen have a different effect on your larnyx than does a helox mix.

Answer 5

CO2 is carbon dioxide .
a gas molecule with one carbon atom & 2 oxygen atom.

air consists of a mixture of gasses,

nitrogen being the majority at 78%
oxygen 21%
CO2 Helium & other gasses, 1%

Answer 6

CO2 stands for carbon do oxide. It is a gas that is formed when the carbon and oxygen atoms combine together[ C (carbon) + O2 ( Oxygen) = CO2] Carbon-di- oxide is a gas that is presend in air, wich also includes other gases such as oxygen, nitrogen, hydrogen etc. We(human beings) inhale oxygen and exhale carbon di oxide.

Answer 7

Co2 - carbon dioxide. One part carbon & 2 parts oxygen. Co2 is what we humans breath out & plants take in to produce oxygen during phtosynthesis.

Air - consist of different elements - mainly N2, O2 & A. Small parts of CO2, H2O, O3 and others

Helium - second lightest chemical element available. Found in abdunce on the moon. Colourless, tasteless, odurless. Use HE as symbol. Exist only in gas.

Answer 8

Co2 is carbon dioxide, it's an atom of carbon bonded with two atoms of oxygen

It is found in the air, and is used by plants for photosynthesis. They use the carbon dioxide to produce energy and food and as a byproduct give off oxygen.

Answer 9

CO2 is carbondioxide. Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms. It is often referred to by its formula CO2. It is present in the Earth's atmosphere at a low concentration and acts as a greenhouse gas. In its solid state, it is called dry ice. It is a major component of the carbon cycle.

Atmospheric carbon dioxide derives from multiple natural sources including volcanic outgassing, the combustion of organic matter, and the respiration processes of living aerobic organisms; man-made sources of carbon dioxide come mainly from the burning of various fossil fuels for power generation and transport use. It is also produced by various microorganisms from fermentation and cellular respiration. Plants utilize carbon dioxide during photosynthesis, using both the carbon and the oxygen to construct carbohydrates. In addition, plants also release oxygen to the atmosphere, which is subsequently used for respiration by heterotrophic organisms, forming a cycle.

Answer 10

Carbon Dioxide

Answer 11

Co2=carbon dioxide
He= helium
O= oxygen
also you exhale Co2