You contain the same elements that are found in and around the earth. the atmosphere contains mostly nitrogen, 78%, and oxygen, 21%. these two elements chemically combine with carbon and hydrogen to form an important compound found in all living things. what is that compound?

a) carbohydrates
b) lipids
c) proteins
d) sugars

protein and lipids

Explanation:

Proteins, like carbohydrates and lipids, are compounds of carbon hydrogen and oxygen. However, unlike carbohydrates and lipids, proteins also contain the element nitrogen and are hence referred to as nitrogenous compounds. In addition to nitrogen, proteins may contain phosphorus or sulphur or both. Some proteins such as haemoglobin contain other elements such as iron.

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answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).