Вопрос школьника по предмету Химия
как составить формулу кислоты
Ответ учителя по предмету Химия
Берешь кислотный остаток нужной кислоты, смотришь на его заряд.
Берешь столько же катионов водорода.
Соединяешь в одну формулу.
Например H2SO4 — серная кислота
Сульфат-анион SO4 имеет заряд 2(-), значит берем 2 катиона водорода — вуаля H2(+)SO4(2-)
*в скобках — заряд иона
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Task 1. Insert the necessary prepositions to make these sentences complete.
1. I know Jill lives in the north of England but at the moment I can’t think ________ the name of the town.
2. Shouting ________ people is very rude, never do it.
3. I’m reading a new book by Tony Parsons. Have you heard ________ him?
4. Teenagers usually begin thinking seriously ________ their future careers.
5. I haven’t heard ________ my cousin Tina for a long time. I’m going to give her a call myself.
Task 2. Choose one of the two words to complete the sentences.
1. Our teacher said our test results were quite (satisfied / satisfying).
2. By Ben’s (amusing / amused) look we understood that he was enjoying the programme.
3. (Forbidden / Forbidding) fruit always tastes sweet.
4. I’ve never seen Max (recited / reciting) poetry; literature isn’t his strong point.
5. She stopped him from entering the room with a (forbidden / forbidding) gesture.
Task 3. Read the text and make it complete with derivatives formed from words on the right.
My little niece Danielle, ________________________ 6, has long had a ________________________ with the “Big Pencil”, the ________________________ Washington Monument. She saw glimpses of it during drives through the District. Her first visit to the top of the monument inspired a closer ________________________ with dead presidents made of metal and stone. It was on the way to the Lincoln Memorial that she made the ________________________ remark. “Is the president really in there?” my niece wanted to know. “No, it’s a big ________________________ of him.”
“Is he ________________________ dead, though?” she asked. “Yes.” She got _________________________ for a moment, trying to reason this through. “So, you mean, after they get rid of presidents, they use them for ________________________?” It was my turn to think.
“________________________.”
age
fascinate
fame
acquaint
forget
sculptor
true
silence
decorate
exact