Предмет: Химия, автор: vlakitaisreal

сколько грамм воды необходимо взять чтобы приготовить 150 грамм 10% раствора хлорида натрия

Ответы

Автор ответа: серная

все очень простоо
m(раствора)=150
m(соли)=15
m(H2O)= m(раствора)-m(cоли)=150-15=135
Ответ:135

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Русский язык, автор: Amirchic3310

обо́греть почему о а не а? Объясните

6 лет назад

Предмет: Математика, автор: Marisa1991

757. Площадь одной комнаты 12 м“, и она составляет 25 % площади
всей квартиры. Найдите площадь всей квартиры.
найдите площадь всей квартиры

6 лет назад

Предмет: Английский язык, автор: milayarosh1708

1 Are just, already and yet in the correct place in these sentences? Tick (+) or cross (-). Correct the
mistakes.
1. I just have finished a really good book. -
I’ve just finished a really good book.
2. Have you bought a new pair of trainers yet?
3. Gary has already tidied up his bedroom.
4. She hasn’t done yet the history project.
5. My grandparents have just got back from a holiday in Japan.
6. We’ve been already to France.

2 Write the words in the correct place in the sentences.
1. I’ve just seen Caroline in the bookshop. (just)
2. My dad has met my new friends, and he’s already embarrassing me in front of them! (just)
3. Has mum started making dinner? (yet)
4. It isn’t time to go. It’s too early. (yet)
5. Hugo has won four medals for the school in athletics this year. We’re all really proud of him. (already)

3 Complete the conversations and write suitable responses with already or yet.
1 A: Have you bought a birthday present for Jill yet?
B: No, I haven’t bought anything for her yet.
C: Yes,
2 A: Has Oliver called you ?
B: Yes,
. (perfume)
. (phone / good news)
3 A: We’ve written our English essays.
B: Well done! . (I / not start)
4 A: I’m amazed at what the basketball team has
achieved so far this year.
B: Yes, but . That’ll be a tough game! (not play / Lakeside School)
5 A: Jules hasn’t watched the film B:
.
, ( I / see / it) and I think he’ll be scared! What about you?
? (you / watch?)

4 Rewrite the sentences with just.
1. We recently moved to this house.
We’ve just moved to this house.
2. I finished my homework a few moments ago.
3. We came back from holiday last night.
4. Your favourite TV programme started now.
5. Sasha woke up five minutes ago.
6. I went to the doctor’s before coming to see you.

5. Correct the mistakes in each sentence.
1. My dad have just came back from Vietnam.
has just come back
2. My uncle moved to another country last year, but he only now found a job.
3. My friend has invited me to the theatre. He already bought the tickets.
4. Next year, there’s a school trip to Paris. I don’t tell my parents yet, but I hope they say yes.
5. She’s heard wonderful things about Croatia, but she didn’t go there yet.
6. Flynn is going on a camping trip. Write questions and answers with already and yet.
– pack bag - – clean walking boots - – wash sleeping bag + – pack snacks and
books - – buy batteries for torch +
1 Has he packed his bag yet?
No, he’s hasn’t packed his bag yet.
2.
3.
4.
5.

6 лет назад

Предмет: Математика, автор: 89056261418a

как будет по англизкаму ваш

9 лет назад

Предмет: Химия, автор: vorobievayulya

Правильные ли это утверждения:
1. При взаимодействии магнию с сульфатной кислотой образуются магний сульфат и водород.

2. Силикатную кислоту добывают взаимодействием силиций (4) оксиду с водой.

Встановите последовательность хим. формул веществ в цепочке добывания кальций сульфату:

а) S

B) H2SO4

G) SO3

D) HSO2

9 лет назад