Which of these orbital designations are invalid?

a. 4s

b. 2d

c. 3f

d. 3p

Select the person responsible for the following: cotton gin

How do levels of carbon dioxide in ocean water compare to those of air?

A scientist is combining two grey elements he thinks he will get a compound why is this prediction wrong

What is 0.0135 moles of in AlCl3 grams? Round to 3 sig figs

for the reaction C+2H2 = Ch4 how many molecules of hydrogen are required to produce 14 grams of methane Ch4?

Consider the reaction: 2 NO (g) + 5 H2 (g) → 2 NH3 (g) + 2 H2O (g) A reaction mixture initially contains 5 moles of NO and 10 moles of H2. Which set of amounts best represents the mixture after the reactants have reacted as completely as possible?

True or False: If you have 2 moles of water and 2 moles of carbon, you have the same number of molecules.

Balancing chemistry equations

How much energy, in joules, is released when 17 kilograms of granite is cooled from 45 C to 21 C?

Is feeling warmth from a fireplace convection, radiation, or conduction?