Занимательная химия для детей и взрослых. И. А. Леенсон

Занимательная химия для детей и взрослых

с 95 до 2,5 % – солидная экономия для такого массового производства. Для определения содержания меди Миллер снимал медь с монеты электрохимически. Интересно, что в 1982 г. выпускались монеты обоих типов, а с 1983 г. – только цинковые с медным покрытием.

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Примечания

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