15) ned flanders mixed silver nitrate and sodium chloride. immediately, ned observed a white solid fall to the bottom of the beaker. he filtered and dried the solid and determined that it was silver chloride. what is the evidence that a chemical reaction occurred? determine how much silver chloride ned obtained and explain how you determined the answer. (hint: law of conservation of mass)

Answer is:  the evidence that a chemical reaction occurred is formation of white precipitate (change of color).

Balanced chemical reaction: AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq).

Solutions of silver nitrate and sodium chloride do not have color.

From chemical reaction: n(NaCl) : n(AgCl) = 1 : 1.

n(NaCl) = n(AgCl).

m(AgCl) = m(AgCl) · M(AgCl).

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.