Ý nghĩa của lễ hội thời Tấm cám

1. Cho 6.5 gam Zn hòa tan hoàn toàn trong 500ml dd HCl. Tính thể tích H2 thoát ra ở đktc và nồng độ mol dd HCl

2. Trung hòa dd KOH 2M bằng 250ml HCl 1,5M

a. Tính thể tích dd KOH cần dùng cho PƯ

b. Tính nồng độ mol của dd muối thu đc sau PƯ

3. Trộn 200ml dd FeCl2 0,15M với 300ml dd NaOH PƯ vừa đủ. Sao PƯ lọc kết tủa nung đến khối lượng k đổi đc m gam chất rắn

a. Viết PTPƯ xảy ra

b. Tính m

c. Tính CM của các chất có trong dd sau khi lọc kết tủa( coi V k đổi)

4. Trung hòa dd KOH 5.6% ( D=10,45g/ml) bằng 200g dd H2SO4 14,7%

a.tính thể tích dd KOH cần dùng

b. Tính C% của dd muối sau PƯ

Nhận biết các chất mất nhãn bằng phương pháp hóa học:

A. Dùng thêm quỳ tím hãy nhận biết các dd sau:

1. H2SO4, NaOH,HCl, BaCl2

2. NaCl, Ba(OH)2, NaOH, H2SO4

B. Bằng pphh nhận biết dd:

1. NaOH, HCl, NaNO3, NaCl

2. KOH, K2SO4, K2CO3, KNO3

C. Dùng dd H2SO4 loãng,nhận biết các chất sau:

1. Cu(OH)2,Ba(OH)2, Na2CO3

2. BaSO4, BaCO3, NaCl, Na2CO3

D. Hãy nêu pphh để nhận biết KL sau: Fe, Al,Cu

Chuyển câu có 2 tân ngữ sang câu bị động:

1. They paid me a lot of money to do the job

2. The teacher gave each of us two exercise books

3. Someone will tell him that news

4. They have sent enough money to those poor boys

5. They have given the women in most countries in the world the right to vote

Chuyển các câu "H/WH" sang câu bị động:

1. Why didn't they help him?

2. How many games has the team played?

3. Where do people speak E?

4. Who are they keeping in the kitchen?

5. How can they open this safe?

6. What books are people reading this year?

7. How did the police find the lost man?

8. Who look after the childen for you?

9. How long have they waited for the doctor?

10. What time can the boys hand in their papers?

11. Who lend you this book?

12. How many marks does the teacher give you?

Chuyển các câu có k° sang câu bị động:

1. Do they teach English here?

2. Will you invite her to your wedding party?

3. Has Tom finished the work?

4. Did the teacher give some exercises?

5. Have they changed the window of the laboratory?

6. Is she going to write a poem?

7. Is she making big cakes for the party?

8. Are the police making inquires about the thief?

9. Must we finish the test before ten?

10. Will buses bring the children home?

11. Have you finished your homework?

Câu bị động

1. They have to repair the engine of the car

2. The boys broke the window and took away some pictures

3. People spend a lot of money on advertising every day

4. Teacher is going to tell a story

5. Mary is cutting a cake with a sharp knife

6. The children looked at the woman with a red hat

7. They have provided the victims with food and clothing

8. People speak English in almost every corner of the world

9. You mustn't use this machine after 5:30p.m

10. After class, one of the students always erases the chalk board

Câu bị động

1. She gave us more information

2. The chief engineer was instructing all the workers of the plan

3. They can't make tea with cold water

4. Somebody has taken some of my books away

5. They will hold the meeting before May Day