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Home Question Bank Chemistry Archive 2024 December 20

Chemistry Questions from Dec 20,2024

Browse the Chemistry Q&A Archive for Dec 20,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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List the two solutions you selected to evaluate. - Identify three criteria of the problem (water pollution) and an explanation as to why these criteria should be met for the problem to be resolved. Make sure to include chemical changes to the water that happen due to pollution. Chemists define the acidity or alkalinity of a substance according to the formula "pH \( =-\log \left[\mathrm{H}^{+}\right]^{\prime} \) where \( \left[\mathrm{H}^{+}\right] \)is the hydrogen ion concentration, measured in moles per liter. Solutions with a pH value of less than 7 are acidic; solutions with a pH value of greater than 7 are basic; solutions with a pH of 7 (such as pure water) are neutral. a) Suppose that you test apple juice and find that the hydrogen ion concentration is \( \left[\mathrm{H}^{+}\right]=0.0003 \). Find the pH value and determine whether the juice is basic or acidic. (Round or truncate the pH to the thousandth. Don't forget to answer the entire question.) Воздушный шар вместимостью 1000 м\( ^{3} \) наполнен водородом. Какова его масса при нормальном атмосферном давлении и температуре \( 20^{\circ} \mathrm{C} \) ? Назад к уроку задание № 2 Смешали некоторое количество \( 15 \% \)-го раствора некоторого вещества с таким же количеством \( 19 \% \)-го раствора этого вещества. Сколько процентов составляет концентрация получившегося раствора? Введите ваш ответ helectron in an atom has a charge of -1 , and each proton has a charge of +1 . What e overall charge of an atom that contains 2 electrons and 2 protons? If you add a proton to an atom, what changes? * Element Charge Mass 14 При проведении химического опыта реагент равномерно охлаждали на \( 7,5^{\circ} \mathrm{C} \) в минуту. Найдите температуру реагента (в градусах Цельсия) слустя 6 минут после начала проведения опыта, если начальная температура составляла \( -8,7^{\circ} \mathrm{C} \). Ответ: สารเอไมด์ทำปฏิกิริยากับ \( \mathrm{P}_{2} \mathrm{O}_{5} \) จะได้ผลิตภัณฑ์เป็นสารใด \( \mathrm{CH}_{3} \mathrm{CONH}_{2} \) ชื่อสารคือข้อใด
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