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1. по закону электролиза I=k*m*dt , где I-сила тока, k-электрохимический эквивалент данного вещества m-масса выделившегося на катоде вещества dt-время прохождения тока через электролит
выведем электрохимический эквивалент k=I/(m*dt)=...
надо перевести граммы в килограммы, минуты в секунды, тогда k будет иметь единицы измерения А/(кг*с)
ИЛИ
По закону Фарадея M = k·I·t.
Подставляя числовые данные, приведя их в систему СИ, мы получаем-
0.0015 = k·4·20·60
ответ: k = 3.125·10^-7
2. Электрохимический эквивалент серебра равен 1.12*10^-6 Кг/К.
При серебрении изделий пользовались током I= 5А в течении t=15мин=900c.Какое количество серебра израсходовано за это время?Электрохимический эквивалент серебра равен k=1.12*10^-6 Кг/Кл. (в ответах написано : 0, 005 кг)
формула для 2 закона Фарадея
m=kIt=1.12*10^-6*5*900 =0.005040 кг= 0, 005 кг
ответ = 0, 005 кг
Закон сохранения импульса-сумма импульса человека- m1*v1 и импульса тележки - m2*v2 до взаимодействия равна импульсу (m1+m2)*v - после взаимодействия.
m1*8 + m2*2 = (m1+m2)*6 , масса человека m1= 80кг