At higher altitudes would there be more or less oxygen available to breathe?
a. Less oxygen is available at higher altitudes.
b. More oxygen is available at higher altitudes.

What was bohr’s contribution to the planetary model

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.