What makes aldehyde and ketones be carbonyl compound with undisplaceable substituent

Aaspirin has a density of 1.40 g/cm^3 what is the volume in cubic centimeters of a tablet weighing 320 mg?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.