Which of these is a chemical property of a substance
a. texture
b. ductility
c. reactivity
d. conductivity

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

0.09 moles of sodium sulfate in 12 ml of solution

Suppose a lab group reports a ppercent yield of sand of 105. is it really possible to collect more sand than was originally represented? what is the possible explanation for the extra product?