What is the energy of a photon with a frequency of 2.2 × 1016 Hz? Planck’s constant is 6.63 × 10–34 J•s.

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.

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?