What are the roles of hydrogen peroxide, oxygen, hydrogen, and catalase in the following chemical reaction?
catalase: 2h2o2 --> 02 + 2h2o

a. catalase is an enzyme, o2 and h2o are substances, and h2o2 is a reactant.
b. catalase is a substrate, o2 and h2o are products, and h2o2 is an enzyme.
c. catalase is a substrate, o2 and h2o are products, and h2o2 is an enzyme.
d. catalase is an enzyme, o2 and h2o are products, and h2o2 is a substrate.

Water ionizes by the equation h2o(l)⇌h+(aq)+oh−(aq) the extent of the reaction is small in pure water and dilute aqueous solutions. this reaction creates the following relationship between [h+] and [oh−]: kw=[h+][oh−] keep in mind that, like all equilibrium constants, the value of kw changes with temperature.

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.