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what consists of elements combined in a specific ratio?
The elements present in KI are potassium (K) ad iodine (I). These elements are present in the ratio 1:1
substances
A chemical formula shows what elements a compound contains, and the ratio of the atoms or ions of the elements in the compound.
Carbohydrates [note correct word or spelling] contain only carbon, hydrogen, and oxygen. Proteins contain all these elements plus nitrogen, and some proteins contain other elements, usually sulfur and/or phosphorus.
8 to 4
There are more than four elements in proteins : Carbon, hydrogen, oxygen, nitrogen, sulphur and selenium being the main six. It is not clear where you got the number 4 from and therefore which four you are asking about.
what consists of elements combined in a specific ratio?
The chemical formula of the compound shows the ratio of the atoms of elements in a compound. This must not be confused with the ratio of their masses.
Proteins are not elements; they are very complex organic compounds.
The elements present in KI are potassium (K) ad iodine (I). These elements are present in the ratio 1:1
substances
The carbon to hydrogen to oxygen ratio in proteins is 1:1.8:0.5. This is much more specific and complicated than the same three's ratio in carbohydrates, which is 1:2:1.
A chemical formula shows what elements a compound contains, and the ratio of the atoms or ions of the elements in the compound.
Nitrogen is found in proteins but not in carbohydrates and lipids
Yes they do, and that is what they are composed from.
that is amino acids