The first ionization energy, E E , of a potassium atom is 4.19 × 10 2 kJ / mol 4.19×102 kJ/mol . What is the wavelength of light, in nanometers, that is just sufficient to ionize a potassium atom? Refer to the values for constants.

What are the resulting coefficients when you balance the chemical equation for the combustion of ethane, c2h6? in this reaction, ethane is burned in the presence of oxygen (o2) to form carbon dioxide (co2) and water (h2o). (g)+(g)→(g)+(g)

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.