At what time of day are dissolved oxygen levels most likely to be highest? a. 6: 00 am b. 12: 00 pm (noon) c. 6: 00 pm d. 12: 00 am (midnight)

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

What is the correct lewis structure for chloroform chcl3

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.