Which of these elements is a transition metal? francium (fr) beryllium (be) chromium (cr) gallium (ga) bismuth (bi)

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

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

How can carbon move from "land" to bodies of water? describe the way human impact has lead to increased levels of co2 in the atmosphere.