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20 tháng 1 2022

hyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyydjyh

20 tháng 1 2022

hyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyydjyh

9 tháng 1 2022

\(m_{KOH}=75.5,6\%=4,2g\)

\(\Rightarrow n_{KOH}=4,2:56=0,075mol\)

\(m_{MgCl_2}=50.9,5\%=4,75g\)

\(\Rightarrow n_{MgCl_2}=4,75:95=0,05\)

PTHH:

\(2KOH+MgCl2→Mg(OH)2↓+2KCl\)

Sau phản ứng \(Mg_{Cl_2}\) dư, \(KOH\) hết

a. \(\Rightarrow n_{Mg\left(OH\right)_2}=n_{KOH}:2=0,075:2=0,0375mol\)

\(\Rightarrow m_{\text{kết tủa}}=0,0375.58=2,175g\)

b. \(n_{KCl}=n_{KOH}=0,075mol\)

\(\Rightarrow C\%_{KCl}=\frac{0,075.74,5}{75+50-2,175}.100\%\approx4,55\%\)

17 tháng 11 2021

d. BaCl2 và H2SO4

Ex I: Put the verbs in the Future simple1.    He……………(make) a delicious meal.2.    The children………………(play) football.3.    John …………..(go) surfing.4.    The family………….(go) on a trip to Japan next summer.5.    The waiter……………(carry) a heavy bag.6.    She…………..(play) the guitar.7.    George………….(throw) the ball.8.    The little boy……………(run) away.9.    Alex……………(read) an interesting book.10.                      ...
Đọc tiếp

Ex I: Put the verbs in the Future simple

1.    He……………(make) a delicious meal.

2.    The children………………(play) football.

3.    John …………..(go) surfing.

4.    The family………….(go) on a trip to Japan next summer.

5.    The waiter……………(carry) a heavy bag.

6.    She…………..(play) the guitar.

7.    George………….(throw) the ball.

8.    The little boy……………(run) away.

9.    Alex……………(read) an interesting book.

10.                       His cat………….(dance)

11.                       We………….(drink) orange juice.

12.                       The children……………..(climb) the mountain.

Ex II: Changes the first 10 sentences into negative

1…………………………………………………………………………..

1…………………………………………………………………………..

1…………………………………………………………………………..

1…………………………………………………………………………..

1…………………………………………………………………………..

1…………………………………………………………………………..

1…………………………………………………………………………..

1…………………………………………………………………………..

1…………………………………………………………………………..

1…………………………………………………………………………..

Ex III: Write and match

Ex IV: Write Will or Won’t                

1.    That suitcase looks heavy. I …………..help you.

2.    Do you think people …………….live on the moon?

3.    I’m hungry. I…………….have some bread.

4.    …………..Ann and Mary at the party? No, they……….

5.    I hope they…………..pass the test.

6.    When do you think we…………..meet our parents?

7.    …………..you be sixteen next year? Yes, I …………..

8.    The sun…………..rise at 5 o’clock tomorrow.

9.    ………….you marry me? Yes, I …………

10.                       There’s no bread and milk left. I……………do the shopping.

11.                       Ask Tim. I’m sure he ………….help you plan the party.

12.                       We…………play football after school tomorrow.

 

Ex V: Put the verb in the correct form (Cho dạng đúng của động từ)

1.    I ……………..(play) tennis tomorrow.

2.    He ………………(pay). I promise

3.    …………..you…………..(open) the door please?

4.    It’s dark. I ………………(switch) on the light.

5.    The weather tomorrow………………..(be) sunny and warm.

6.    She……………..(go) to the sea later today.

7.    I……………….(be) back soon.

8.    I think Tom …………………(pass) the exam next week.

9.    That suitcase is too heavy. They……………….(help) you.

10.We ……………(finish) our homework in an hour.

Ex VI: Write sentences using the given prompts (Viết câu dựa vào gợi ý cho sẵn)                    

1.    I/feed/the dog/soon     ………………………………………………

2.    Dad/fix/my bike/tomorrow. ………………………………………...

3.    Grandma/bake/some/biscuits.………………………………………

4.    I/think/they/come/soon……………………………………………..

5.    They dog/bite/him…………………………………………………..

6.    They/sleep/in a tent/………………………………………………...

7.    The weather/be/poor/tomorrow…………………………………….

8.    They/go/London/next month……………………………………….

9.    He/buy/new car/next Sunday……………………………………….

10.I/play/tennis/the afternoon/…………………………………………

11. We/go/sea/next week/……………………………………………..

12. She/come/see me/the evening/…………………………………….

 

Ex VII: Write negative sentences (Viết câu phủ định)

1.    Rick/not come/with us ……………………………………………..

2.    Sarah/not eat/the soup………………………………………………

3.    The kids/not make/ a mess………………………………………….

4.    I am sure/you/not get/ill…………………………………………….

5.    She/not feed/the cat…………………………………………………

6.    She/not cook/the dinner…………………………………………….

7.    I/not ride/bike……………………………………………………….

 

Ex VIII: Write questions (Viết câu hỏi)    

1.    What ………………...(you/do) tomorrow?

2.    ………………..(Susan bake) the cake tomorrow?

3.    ……………….(you study) history at university?

4.    …….……………….(he be) here for the summer?

5.    …………………..(your dad take) you to the airport?

6.    …………………..(Peter study) hard for the exam?

7.    Where……………..(you be) tomorrow?

8.    Why………………..(you visit) the city?

 

Ex IX: Read and complete                   

  cakes        camping       park       weekend        bring

 

Laura: What will you do this (1)……………?

Mary: I will go ………….

Laura: Where will you go?

Mary: I will go camping in the (3)……………..near my house

Laura: What will you (4)…………..with you?

Mary: I will bring water, fruit and some (5)…………….

 

Ex X: Put the words in order (Sắp xếp từ xáo trộn thành câu)

1.    boys/go/the/weekend/Where/this/will/?

…………………………………………………………………………….

2.    post/will/Why/letter/mother/this/your/?

…………………………………………………………………………….

3.    won’t/leave/farmers/their/week/the/next/village

…………………………………………………………………………….

4.    friends/will/play/When/you/badminton/your/with/?

…………………………………………………………………………….

5.    carry/he/bag/Will/heavy/that/?

…………………………………………………………………………….

Ex XI: Write the answers  

1.    What will you do tomorrow?

…………………………………………………………………………….

2.    Where will you go next weekend?

…………………………………………………………………………….

3.    Will you travel to Nha Trang next year?

…………………………………………………………………………….

4.    Who will you go to the cinema with tomorrow?

…………………………………………………………………………….

Ex XII: Read

My name is Rick. I live in England with my family. I usually get up at half past seven. Next week, we will go to the mountains. We will go there by car. It will take about twenty minutes. I will climb the mountain and visit some friends. I will stay in my friends’ house and play volleyball. I will bring my bag. We will have a great time together.

Write True or False

1.    Rick lives in England with his sister.                                  ………

2.    Rick will go on a picnic next week.                                    ………

3.    They will go there by car.                                                     ………

4.    Rick will climb the mountain.                                             ………

5.    Rick will bring his umbrella.                                               ………

Answer the questions

1.Where does Rick live?

…………………………………………………………………………….2.  What time does Rick usually get up?

…………………………………………………………………………….3. Where will they go next week?

…………………………………………………………………………….

4.How will they go to the mountains?

…………………………………………………………………………….

5.What will Rick visit?

 

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17 tháng 11 2021

Này, để tôi nói nhó. Nếu ko biết một câu hay vài cuâ thì ngta còn làm giúp cho... Chứ nguyên bài thế này thì ko ai làm giúp cho đâu bạn ạ. Bạn nghĩ có ai có thời gian mà làm bài tập về nhà hộ bạn à, tôi bình luận xong tôi báo cáo bạn luôn.

20 tháng 11 2021

Chỉ đùa thôi xem mấy người nói gì

16 tháng 11 2021

d)  2ZN + 4AgNO3 -> 2ZN(NO3)2  + 4Ag

16 tháng 11 2021

e)  2FeCl + 3Ca(OH)2 -> 2Fe(OH)+ 3CaCl2

20 tháng 1 2022

hyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyydjyh

16 tháng 11 2021

1, phải có ánh sáng

2, 6 CO2+ 6 H2O+ năng lựơng ánh sáng mặt trời -> C6H12O6 + 6 O2.

3, phản ứng có lợi tại vì nó tạo ra đường, một chất dinh dưỡng (mik ko tìm tháy thêm lý do)

4, chăm sóc cây thật tốt, trồng cây chỗ có nhiều ánh sáng

HT