How many possible orbitals are there for n = 3?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

What relationship exists between an enzyme and a catalyst?

Ineed this awnser fast select the correct answer. this chemical equation represents the burning of methane, but the equation is incomplete. what is the missing coefficient in both the reactants and the products? ch4 + → co2 + a. 0 b. 1c. 2d. 3 e. 4