There are a few ways to tell if a reaction has taken place, these include temperature change, color change, formation of a precipitate, bubbling, and even odors. These all indicate that a chemical change has taken place.
Answer:
259 mg is the mass of silver chloride required to plate 195 mg of pure silver.
Explanation:
Silver chloride contains 75.27 percent silver. It can be concluded that:-
For every 100 mg of silver chloride, 75.27 mg of silver we can get.
So, to produce 195 mg of silver, the amount of silver chloride required can be calculated as:-

<u>259 mg is the mass of silver chloride required to plate 195 mg of pure silver.</u>
Frequency of photon = is 6.85 X 10¹⁴ sec⁻¹
Energy of photon , E = hv
where h is Planck's constant, v is the frequency of photon
E = 6.63 × 10⁻³⁴ J.s x 6.85 X 10¹⁴ s⁻¹
E = 4.54 x 10⁻¹⁹ J
Therefore, the energy of a photon of green light is 4.54 x 10⁻¹⁹ J.