Select the chemical equation that best represents the description below. Hydrochloric acid reacts with solid chromium to produce a solution of chromium (II) chloride and bubbles of hydrogen gas
o NaCl(aq) + NH3(aq) → NaOH(aq) + NH_CL9)
o HgCl 2(s) + C10H16N20(aq) → HgC10H12N204(aq) + 4HCl(aq)
o CrCl(aq) + H26) → 2HCl(aq) + Cr(s)
O 2HCl(aq) + Crs) → CrCl(aq) + H266)

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

What are the applications of electromagnetic waves

Unpolarized light whose intensity is 1.19 w/ is incident on a polarizer. (a) what is the intensity of the light leaving the polarizer? (b) if the analyzer is set at an angle of = 41.0∘ with respect to the polarizer, what is the intensity of the light that reaches the photocell?