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trời dài quá ,bn hỏi từ cái 1 thôi chứ thế này ko ai trả lời hết đâu

Dài thế này ai làm nổi lần sau bạn gửi ít thì người ta mới trả lời dc

30 tháng 7 2021

bạn ơi cho mik hởi đề bài là j vậy? chia đt cần có đề bài bn nha. bn chụp lại ik

30 tháng 7 2021

7. is cleaning                               16 isn't working

8 is barking                                  17 is raining

9 are singing                                18 aren't listening

10 are playing                              19 are you waiting  

11 are showing                             20 Is it snowing, is raining

12 are bringing                             21 Are you doing, are doing

13 is watching                              22 Are you listening, am listening

14 is winning                                23 Are you watching, are studying

15 is standing   

~Chúc bn học tốt!~                                 

26 tháng 1 2022

\(m_{H_2O}=1.450=450g\)

\(m_{dd}=450+50=500g\)

\(C\%_{BaCl_2}=\frac{m.100\%}{m_{dd}}=\frac{50.100\%}{500}=10\%\)

30 tháng 7 2021

Cậu của mình:

He is cut the bread by the slice.

Chúc học tót tiếng Anh.

30 tháng 7 2021

She is cutting bread into slices

Bạn học tiếng anh 123 à

Học tốt

I. Pick out the word whose underlined and bold part is pronounced differently from that of the other words1.​A.fish​​​B. like​​​C. nine​​D. rice2.​A. apple​​B. cabbage​​C. take​​​D. matter3.​A. brown​​B. round​​C. how​​​D. nose4.​A. takes​​B. yards​​C. starts​​D. books5.​A. hotel​​​B. those​​C. hospital​​D. cold6. ​A. end​​​B. help​​​C. ahead​​D. eatII. Complete sentences using the words in the...
Đọc tiếp

I. Pick out the word whose underlined and bold part is pronounced differently from that of the other words

1.​A.fish​​​B. like​​​C. nine​​D. rice

2.​A. apple​​B. cabbage​​C. take​​​D. matter

3.​A. brown​​B. round​​C. how​​​D. nose

4.​A. takes​​B. yards​​C. starts​​D. books

5.​A. hotel​​​B. those​​C. hospital​​D. cold

6. ​A. end​​​B. help​​​C. ahead​​D. eat

II. Complete sentences using the words in the blankets

1. There …………………five people in Nga’s family. ( am / have   / is / are ).

2. ……………….beef do you want? ( How old / How many /How much/ What)

​- I want 2 kilos of beef. ​ 

3. My father……..……………….to work by car. ( go / travels / drive / live)

4. The hospital is ………..…………….…the river. ( next to / in / on / under)

5. My mother is not big. She is…………..………....( big /  small / fine / game)

6. They………….….…dinner at the moment. ( is having / are having/ have / has)

7. ………..does she live? – On Nguyen Trai street. ( Where/ What / How / Who)

8. My sisters ……………….….teeth every day. ( brush / play / read/ brushes)

 

III. Use the correct form of the verbs in the blankets

1. In the afternoon, he (read)………………books,and they (play)……………soccer.

2. Do you (like)………………..chicken? No, I ……………………

3. There (not be)……………………any tea. There (be)………………..some coffee.

4. Nam (live)……………………in Gialai. Minh (live)……….…………..in Hanoi.

IV. Put a / an / some  or any

1. I like ………………eggs and …………………..meat.

2. I don’t want ………………soup. I want ………………….vegetables.

3. Nga is …………..…….worker. She has ……………..oval face.

4. Do you want……………………milk? Yes, I want………………

V. Matching

 

A

B

1. How do you go to school?

2. How old is Lan?

3. What does she do?

4. Does she play soccer?

5. Do you watch TV?

6. What’s your favorite food?

7. Where is the bookstore?

8. What do you do in your free time?

a. She is ten years old.

b. I like chicken.

c. I play soccer.

d. I go to school by bike.

e. She is a doctor.

f. Yes, I do.

g. It is next to the hotel.

h. No, she doesn’t.

 

VI. Read and choose the best answers

Today is Sunday, Mrs.Lien (1)………………….to the market. She  goes (2)…….…..motorbike. She (3)……………………many things. First, she wants (4)……………. kilo of fish and five hundred grams of beef. She(5)………………like eggs, so she doesn’t buy eggs. Then, she wants (6)……………………….vegetables. She needs four cans of peas, (7)……………….of toothpaste. She goes home (8)………………ten o’clock.

 

1.​A. go​​​B. play​​​C. going​​D. goes

2.​A. on​​​B. by​​​C. to​​​D. at

3.​A. want​​B. like​​C. wants​​D. don’t want

4.​A. some​​B. any​​​C. an​​​D. a

5. ​A. not​​​B. don’t​​C. doesn’t​​D. isn’t

6.​A. some​​B. any​​​C. an​​​D. a

7.​A. a bar​​​B. a tube​​C. a box​​D. a can

8.​A. at​​​B. on​​​C. in​​​D. to

 

 

VII. Read and choose the best answers

This is Thuan. He is eleven years old. He is in grade 6. His family has four people, his parents, his sister and Thuan. They live in a small house near the Lam river. Thuan gets up at five o’clock. He has breakfast at six fifteen. He goes to school at half past six. The school is not near his house, so he goes by bike. His classes start at seven and end at eleven fifteen. He goes home at twelve o’clock. He has lunch at twelve ten. He likes meat and vegetables. He doesn’t like fish. In the afternoon, he does his homework and then he plays soccer with Minh, his friend.

 

Sentences

True

False

1.  Thuan is eleven years old.

 

 

2. There are five people in his family.

 

 

3. He gets up at six o’clock.

 

 

4. The school is near his house.

 

 

5. He likes meat.

 

 

6. He plays soccer with Minh in the morning.

 

 

7.His classes finish at eleven o’clock.

 

 

8. He is in grade 6.

 

 

 

VIII. Make questions

1. ……………………………………………………………………..?

I live on Quang Trung street

2. ……………………………………………………………………..?

Yes, he plays video games.

3. ……………………………………………………………………….?

She goes to school by motorbike.

4. ……………………………………………………………………….?

I’m in class 6B.

 

 

IX. Arrange the words or phrases to make full sentences

 

1. people/ are/ How / in / family / many/ there/ his.

-> …………………………………………………………………….?

2. and / round / full / has / a / lips / face / Hoa.

-> …………………………………………………………………….

3.  by/ he / school / bus / goes / to      

-> …………………………………………………………………….

4. hungry / We / not /are / 

-> …………………………………………………………………….

5. Mr. Quang / what / do / does.

-> …………………………………………………………………….?

6. music / not / to / Nga / listen / does /   

-> …………………………………………………………………….

7. is/ She / playing/ soccer/ 

-> ………………………………………………………………….

8. bananas / How / does/ many / want / he

-> …………………………………………………………………….?

10

Bài VI

Today is Sunday. Mrs. Brown goes to the market in the morning. She needs many things. First, she wants some meat : one kilo of fish five hundred grams of beef. Then, she wants some vegetables. She needs three cans of peas and one kilo of tomatoes. Finally, she wants two cans of beer and four bottles of mineral water. She goes home by taxi.
30 tháng 7 2021

I .

1A 2C 3D 4B 5C 6D

29 tháng 7 2021

Lưu huỳnh:

Có dẫn điện

Nhưng dẫn nhiệt kém

Khi đốt cháy hoàn toàn một thể tích hiđrocacbon X, thu được thể tích khí CO2 gấp đôi thể tích hiđrocacbon X khi đem đốt (trong cùng điều kiện về nhiệt độ và áp suất). Hiđrocacbon đó là:

A. C3H8.

B. C2H4.

C. CH4.

D. C3H6.

B nha bạn

29 tháng 7 2021

Khi đốt cháy hoàn toàn một thể tích hiđrocacbon X, thu được thể tích khí CO2 gấp đôi thể tích hiđrocacbon X khi đem đốt (trong cùng điều kiện về nhiệt độ và áp suất). Hiđrocacbon đó là:

A. C3H8.

B. C2H4.

C. CH4.

D. C3H6.

4 tháng 2 2022

\(m_{H_2SO_4}=\frac{200.19,6}{100}=39,2g\)

\(\rightarrow n_{H_2SO_4}=\frac{39,2}{98}=0,4mol\)

\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\)

x                  x                x                    x

\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)

y               1,5y                    0,5y                 1,5y

Đặt \(\hept{\begin{cases}x\left(mol\right)=Mg\\y\left(mol\right)=Al\end{cases}}\)

a. Có hệ phương trình là: \(\hept{\begin{cases}24x+27y=7,8\\x+1,5y=0,4\end{cases}}\)

\(\rightarrow\hept{\begin{cases}x=0,1\\y=0,2\end{cases}}\)

\(m_{Mg}=0,1.24=2,4g\)

\(m_{Al}=7,8-2,4=5,4g\)

b. \(n_{H_2}=0,1+1,5.0,2=0,4mol\)

\(\rightarrow m_{H_2}=0,4.2=0,8g\)

\(m_{ddsaupu}=m_{hh}+m_{ddH_2SO_4}-m_{H_2}\)

\(\rightarrow m_{ddsaupu}=7,8+200-0,8=207g\)

Những dung dịch thu được sau phản ứng: \(MgSO_4;Al_2\left(SO_4\right)_3\)

\(m_{MgSO_4}=0,1.\left(24+32+16.4\right)=12g\)

\(\rightarrow C\%_{MgSO_4}=\frac{12.100}{207}=5,8\%\)

\(m_{Al_2\left(SO_4\right)_3}=0,5.0,2.\left(27.2+32.3+16.12\right)=34,2g\)

\(\rightarrow C\%_{Al_2\left(SO_4\right)_3}=\frac{34,2.100}{207}=16,52\%\)

30 tháng 7 2021

Fe + 3KOH → Fe(OH)3 + 3K

29 tháng 7 2021

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29 tháng 7 2021

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