Question

Which of these is a compound

A) O

B)CO2

C)O2

D)Co

Answer 1

CO2 because that’s two elements , C and O2 . You can tell by the letters . 1 letter = 1 Element . B is the only choice with 2 therefore B is the correct answer

Answer 2

Answer:B. CO2

Explanation: It is B because it has both letters capitalized if it is a compound and it only has 1 letter capitalized if it is an element.