27. the diagram shows an electrolytic cell in
which the electrodes are tin and copper.
switch
battery
sn (s)
beaker
ces)
saul
solution
when the switch is closed, what will happen
to the two electrodes?
(1) b will dissolve and a will become coated
with tin.
(2) a will dissolve and a rbeit sonfed
with tin.
(3) b will dissolve and a will become coated
with copper.
(4) a will dissolve and b will become coated
with copper

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?