which of these elements must be in organic compuonds oxygen hydrogen carbon helium or iron
Carbon dioxide is chemical compound. Oxygen and nitrogen are chemical elements.
The compound name for nitrogen, hydrogen, and oxygen is Ammonium Nitrate (NH4NO3).
Water is a compound made of hydrogen and oxygen. Nitrogen and oxygen are elements on their own.
No, hydrocarbons contain carbon (C) and hydrogen (H) NH3 is a compound of nitrogen and hydrogen.
Carbon, hydrogen, and oxygen
No, urea crystals are not an element. Urea is a compound composed of carbon, nitrogen, oxygen, and hydrogen atoms.
An organic compound must contain carbon and hydrogen, but also may contain oxygen, nitrogen, sulfur, and phosphorus. An organic compound that contains only carbon and hydrogen is called a hydrocarbon.
The human body is made up of only mostly carbon, oxygen, hydrogen, nitrogen, calcium, and phosphorus. The top four elements are oxygen, carbon, hydrogen and nitrogen, so that would be a. on your list.
The elements most commonly found in organic compounds are carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur and phosphorus. Carbon and hydrogen are the primary elements in organic molecules, while oxygen, nitrogen, sulfur, and phosphorus can also be present in varying amounts depending on the specific compound.
All proteins contain carbon, hydrogen, oxygen and nitrogen. Most of them also contain sulfur, which is found in the standard amino acid residues cysteine and methionine (any given protein might not contain either of these, though it would be unusual).
The most abundant elements in the universe, in order from most to least abundant, are Hydrogen, Helium, Oxygen, Carbon, and Nitrogen. Therefore, the correct list would start with Hydrogen, followed by Helium (not listed), then Oxygen, Carbon, and finally Nitrogen. The first option you provided, "Hydrogen Oxygen Nitrogen Carbon," is almost correct but is missing Helium and has an incorrect order for Nitrogen and Carbon.