Where are elements located based on their mass?

Predict the products butane (c4h10) + oxygen —>

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride