40
60 100 150
5 10 15 20 25 30 40 60 10
walume of hl30 50 63 75 83 89 94 100 101
called com
(a) slunch the experimental set-up.
() ploe the volume of hydrogen gas collected
a t the time taken
c) saan the time taken for the reaction to rea
completion
(2) expathe gradual decrease of the reaction
(6) why did the student stop taking readings
a ncond intervals after 30 seconds?
explain the importance of taking readings
n o successive readings agree.
on the same axes, sketch and explain the
one that would be obtained at
a higher temperature.
6) lower acid concentration

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.

The nuclear fission process releases neutrons and question 27 options: alpha particles electrons energy beta particles

Drug abuse will not lead to physical and psychological dependence. true or false ?