Which of the following pairings of pH and hydronium ion concentration is correct? A: pH = 7.0; [H3O+] = 1 x10^–7

B: pH = 2.0; [H3O+] = 1 x10^2

C: pH = 9.0; [H3O+] = 9 x10^–9

D: pH = 3.0; [H3O+] = 3 x10^–11

The balanced chemical equation for this lab is: 3cucl2(aq) + 2al(s) 3cu(s) + 2alcl3(aq) if 10.5 g copper chloride react with 12.4 g aluminum, what is the limiting reactant?

Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)