calcium carbonate is one of them, CaCO3
eggshell is a kind of compound CaCO3 (calcium carbonate)
In the nature the majority of chemical elements are found as compounds.
Calcium carbonate.
Eggs are mixtures and do not have a chemical formula.
Neoprene is one of the chemical compounds that can be found in a neo-laptop. Neoprene usually exhibits good chemical stability and maintains flexibility over a wide temperature range.
Popcorn is mainly starch.
The two major chemical compounds found in a membrane are phospholipids and proteins. Phospholipids make up the bilayer structure of the membrane, while proteins serve various functions such as transport, signaling, and support within the membrane.
There is no such formula, unless you wanted the formulae of all the chemical compounds found in popcorn.
ionic and covalent
According to information available on the internet THMs are trihalomethanes, these are chemical compounds that are formed in water and so are found in water.
The chemical symbols of a highlighter typically include compounds like C(NH2)3, CH3COOC2H5, and C4H4N2. These compounds are commonly found in the fluorescent ink used in highlighters to create bright colors.
The green color in egg whites is caused by a chemical reaction between sulfur compounds in the egg and iron in the eggshell. This reaction occurs when the egg is cooked for too long or at too high a temperature.