How to obtain ethylene from trichloromethane? ?

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

How are isotopes of the same chemical element alike? how are they different?