1. A laser beam is reflected off a plane mirror, as shown below. What must be the measure of the angle of incidence of the beam?

Which of the following statements about acidic water is true? a. acid has no effect on the h, o molecules. b. the solution contains a larger number of oh ions than h, o ions. c. the solution contains a larger number of h, o ions than qh ions. d. the solution contains an equal number of h, o ions and oh ions. none of the above e.

Draw the lewis structure for the trisulfur s3 molecule. be sure to include all resonance structures that satisfy the octet rule.

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold