zadrotovg
08.12.2021 10:13

21. The lamp is the television.
22. The tree is the door.
23. What’s that girl?
A) It’s a student B) She’s student. C) She’s a student. D) She’s a student girl. E) She student.
24. Do the girls know Tom?
A) Yes, they knows her. B) No, they isn’t. C) Yes, they know. D) No, they don’t.
E) No, they don’t know.
25. Choose the correct answer. Only one answer is correct.
A) John’s looking at I and you. B) Your looking at John and I. C) I’m looking at you and John.
D) John and I am looking at you. E) John and she is looking at you.
26. Choose the correct answer. Only one answer is correct.
A) That girl is some of my friends. B) This girl is one of my friends. C) That girl is me friend.
D) This girl’s are friends. E) That girl is any of my friends.

27. Choose the correct answer. Only one answer is correct.
A) This is Mr. Smith there. B) That is the Mr. Smith there. C) This is the Mr. Smith here.
D) That is Mr. Smith there. E) That is Mr. Smith here.
28. Our house is Washington Street
29. Choose the correct answer. Only one answer is correct.
A) Who now in London lives? B) Who in London live? C) Who lives in London now?
D) Who live now in London? E) Who live in London now?
30. Jane is in front of Tom. Tom is Jane.
31. Tom is Mrs. Smith’s son.
A) She is his son. B) She is her son. C) He is her son. D) He is his son. E) He is hers son.
32. Choose the correct answer. Only one answer is correct.
A) Come here to us! B) Go here to we! C) Go there to us! D) Come here to my!
E) Come here to !
33. Choose the correct answer. Only one answer is correct.
A) Don’t look at us! B) Don’t looking at us! C) No looking at we! D) Not look at us!
E) Doesn’t look at us!
34. Choose the correct answer. Only one answer is correct.
A) Some girl are listening to the old men. B) An old man is listening to the girl. C) An old men are listening the girl. D) The old man are listening to a girl. E) The old man is listening to a girl.
35. Choose the correct answer. Only one answer is correct.
A) Listen to he and he’s brother! B) Listen to he and his brother! C) Listen to him and his brother! D) Listen to him and he’s brother! E) Listen to him and brother!
36. She …(to be)__ a student. She …(to be)_ a good student.
37. My mother …(to be)_ not a teacher.
38. …(to be)_ your brother at school? – Yes, he (to be)… .
39. My friend …(to be) an engineer. He …(to be)_ at work.
40. Nick (to be)_… not a coolege student. He …(to be) a school boy. He …(to be) at school now.
41.Open…door, please.
42.There are… flowers on the table.
43.Where is…your plan?
44.Are those… English books?
45. Why are standing in the in the corridor? Come …, please.
46. Who is …duty today?
47. I am fond of listening… these records.
48. There is a picture …the sofa.
49. There are a lot of flowers… the building of our institute.
50. Mary is writing… chalk on the blackboard.
51. The picture is …the wall.
52.There(to be)… ten pens and a magazine on the table.
53. There (to be)…many cars in front of the house.
54. Who…(to be)speaking?
55. What (to be)… you doing?
56. I…(to be) very sorry.
57. Our class (to be)_…over.
58. … you like a cup of coffee?
59. There are (мало) foreign students in our institute.
60. Her flat is on the ground floor, (моя) is on the ground floor
61. Whose map is this? It’s (его).
62. Give me ( какой-нибудь) magazine, please.
63.We…take a vacation this month.
A) is not; B) did not; C) will not; D) do not; E) are not.
64. After the festival is over she… a vacation with her family.
A) does not take; B) did not take; C) will not take; D) will take; E) take.

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Ответ:
NikitaVaselenk
17.01.2023 19:52

zubareva45 avatar

Дано:

m(H₂O)=3,6г.

n(H₂)-? m(H₂)-?

1. Молярная масса воды:

M(H₂O)=18г./моль

2. Количество вещества воды в 3,6г. :

n₁(H₂O)=m(H₂O)÷M(H₂O)

n₁(H₂O)=3,6.÷18г./моль=0,2моль

3. Запишем уравнение реакции:

zubareva45 avatar

2H₂O=2H₂+O₂

по уравнению реакции:

n(H₂O)=2моль n(H₂)=2моль

по условию задачи:

n₁(H₂O)=0,2 моль n₁( H₂)=0,2моль

4. Молярная масса водорода:

M(р₂)=2г./моль

5. Масса водорода количеством вещества 0,2моль:

m(H₂)=n₁(H₂)xM(H₂)

m(H₂)=0,2мольх2г./моль=0,4г.

6.ответ: при разложении воды 3,6г.образуется водород количеством вещества 0,2моль и массой 0,4г.

zubareva45 avatar

4. М(Н₂)=2г./моль

Объяснение:

0,0(0 оценок)
Ответ:
yoohbabe
15.10.2021 06:05

zubareva45 avatar

Дано:

m(H₂O)=3,6г.

n(H₂)-? m(H₂)-?

1. Молярная масса воды:

M(H₂O)=18г./моль

2. Количество вещества воды в 3,6г. :

n₁(H₂O)=m(H₂O)÷M(H₂O)

n₁(H₂O)=3,6.÷18г./моль=0,2моль

3. Запишем уравнение реакции:

zubareva45 avatar

2H₂O=2H₂+O₂

по уравнению реакции:

n(H₂O)=2моль n(H₂)=2моль

по условию задачи:

n₁(H₂O)=0,2 моль n₁( H₂)=0,2моль

4. Молярная масса водорода:

M(р₂)=2г./моль

5. Масса водорода количеством вещества 0,2моль:

m(H₂)=n₁(H₂)xM(H₂)

m(H₂)=0,2мольх2г./моль=0,4г.

6.ответ: при разложении воды 3,6г.образуется водород количеством вещества 0,2моль и массой 0,4г.

zubareva45 avatar

4. М(Н₂)=2г./моль

Объяснение:

0,0(0 оценок)
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