Вопрос школьника по предмету Химия
составьте химическую формулу молекуулы,которая содержит-а) один атом Нитрогена и три атома Гидрогена,б)четыре атома Гидрогена,два атома Фосфора и семь атомов Оксигена
Ответ учителя по предмету Химия
А) NH3, аммиак
Б) H4P2O7 дифосфорная кислота
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Present Simple Small children usually attend kindergartens both in Russia and Great Britain. Present Simple Students don’t need to take National exams after finishing primary school. Past Simple All the students entered the college. Future Simple The Universities will provide free or paid education to school graduators. Modal Parents should support children in their wish to enter a college. Modal No one must miss the elective classes to prepare for the exams. Present Perfect Tutors have played with children and have taught them reading and writing at nursery classes. Past Simple Simon didn’t choose the subjects to take at State exams. Future Simple Will our teacher explain us the rules of taking the exam? Modal Students can choose any optional course they would like. Present Progressive School children are writing a composition for the exam preparation now. Past Simple My parents allowed me to leave school after the 9th grade. Future Simple Joanne will get a high mark for the essay. Modal Boarding schools must provide the students with accomodation. Present Progressive My classmates are filling in the application forms for the State exams at the moment.