What is the approximate hydronium ion concentration and hydroxide ion concentration in bleach? which is higher?

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

What are fossils of organisms that existed over a wide area but only for a limited time period called?

Is of of 3- ? a. 1--3- b. 1--2- c. 1--3- d. of