4. Platinum has a density of 21.45 g/cm3. What is the mass of a platinum bar measuring 2.00 in × 2.50 in × 1.50 in? (1 in = 2.54 cm)

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.

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

Nan element’s square on the periodic table, the number with the greatest numerical value represents the