Which analogy most accurately describes quantized energy levels? a. A ramp.
b. Garden steps that get closer together the further they are from the ground.
c. The slope of a hill.
d. A ladder with evenly spaced rungs.

What state of matter is ice a. liquid b. element c. solid d. gas

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.

Determine the ph of 0.10 m nh3 solution. nh3 is a weak base with a kb equal to 1.8 x 10-5 round answer to nearest whole number.