What are some examples of compounds?

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A compound is a substance that is made up of two or more elements. Some examples of compounds include water, carbon dioxide, and table salt.

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A chemical compound is a chemical substance that is made of two or more atoms of different elements that share a chemical bond. A chemical formula represents the ratio of atoms per element that make up the chemical compound. This is done via the use of subscripts. The subscript that lies to the right of the symbol for each element indicates the number of atoms of that element that make up that chemical compound. 

Examples of chemical compounds are as follows:

- Water (H2O, consisting of 2 hydrogen atoms and one oxygen atom)

-  Carbon dioxide (CO2, consisting of one carbon atom and two oxygen atoms)

- Sodium Chloride (NaCl, consisting of one sodium atom and one chloride atom)

- Methane (CH4, consisting of one carbon atom and four hydrogen atoms)

The second link provided below show a slue of other examples of chemical compounds. 

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Compounds are substances that can be broken down through various chemical processes into elements.  Elements are substances that cannot be broken down any further; all the atoms of an element are identical.  However, a compound contains at least two different kinds of elements. Combinations of the various elements creates compounds.  Different ratios of those same elements creates different compounds.

Water, being composed of the elements hydrogen and oxygen, is therefore a compound, as is carbon dioxide, which is composed of the elements carbon and oxygen.  Ammonia, composed of the elements nitrogen and hydrogen, is also a compound.  Adding an additional atom of oxygen to a water molecule creates a new compound -- although it still just contains hydrogen and oxygen, like water (H2O), it has two atoms of each.  This is the compound hydrogen peroxide (H2O2).

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A compound, when we are talking about chemistry, is simply any substance that is made up of two or more elements which react with one another.  The elements must be present in fixed ratios.

So water is an example of an element.  In all pure water, there are two parts of hydrogen to one part of oxygen.

Similarly, carbon dioxide fits the criteria for being a compound.  You have two elements, carbon and oxygen, that react to bond to one another.  There is always two parts oxygen to one part carbon in this compound.

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