On Earth, Elvis finds his weight as 100 lbs. Planet A has 1/2 of Earth's gravity. How much does Elvis weigh on Planet A? lbs

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

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