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10 tháng 11 2021

a) Giải thích lại 

CuO tác dụng được với H2SO4 vì CuO là Oxit base 

=> Tác dụng được với Acid 

10 tháng 11 2021

CuO tác dụng được với H2SO4 vì dựa vào dãy hoạt động kim loại Cu đứng trước (H)

Cu KHÔNG tác dụng được với HCl vì Cu đứng sau (H) trong dãy hoạt động kim loại 

Cu tác dụng được với AgNO3 vì Ag không tan trong nước ; Cu(NO3)2 tan trong nước

10 tháng 11 2021

Gọi nCH4 = x (mol), nH2 = y (mol)   (x,y>0)

ta có :
nhỗn hợp = 11,2/22,4 = 0,5 mol

--> x + y = 0,5 (1)

pthh:

CH4 +2O2 ----> CO2 + 2H2O

  x   -->               x     ---> 2x

2H2 + O2 ---> 2H2O

y   --->                y

Lại có: nH2O = 16,2/18 = 0,9 (mol)

----> 2x + y = 0,9 (2)

Từ (1) và (2) ---> x = 0,4            y = 0,1   (mol)

VCH4 = 0,4 . 22,4 = 8,96 l

VH2 = 0,1 . 22,4 = 2,24 l

VCO2 = x.22,4 = 0,4 . 22,4 = 8,96 l

Xong rồi đok

protect                       ,             volunteers                       ,                              environment               ,                 build      ,           mostThe Peace Corps is one of the (1)____________   famous organisations in the world that help people. It was founded in 1961 by the former US President John Kennedy. People working in this organisation are called (2) ____________. They are both men and women. They share skills with people to help solve challenging...
Đọc tiếp

protect                       ,             volunteers                       ,                              environment               ,                 build      ,           most

The Peace Corps is one of the (1)____________   famous organisations in the world that help people. It was founded in 1961 by the former US President John Kennedy. People working in this organisation are called (2) ____________. They are both men and women. They share skills with people to help solve challenging problems in developing countries. 

Peace Corps volunteers work as teachers at schools. They also help communities to (3) ____________ their environment and prevent the spread of diseases. Peace Corps volunteers (4)____________ bridges of cross-cultural understanding with people of other countries. They help people from other countries learn more about who they are.                                                                                                                     

1
10 tháng 11 2021

The Peace Corps is one of the (1)__bulid__________   famous organisations in the world that help people. It was founded in 1961 by the former US President John Kennedy. People working in this organisation are called (2) _vlunteers___________. They are both men and women. They share skills with people to help solve challenging problems in developing countries. 

Peace Corps volunteers work as teachers at schools. They also help communities to (3) eviroment____________ their environment and prevent the spread of diseases. Peace Corps volunteers (4)_protect___________ bridges of cross-cultural understanding with people of other countries. They help people from other countries learn more about who they are.                  

1. My brother finds teaching is interesting although it is a hard work.                        A                   B          C              D2. There are many reasons why it is importance to have a hobby.                A                 B                          C                  D3. My sister enjoys listening to music and sing with her friends.                                   A             B               C     D4. If you have a lot of coins, stamps, toys bottles or dolls, your hobby is...
Đọc tiếp

1. My brother finds teaching is interesting although it is a hard work.

                        A                   B          C              D

2. There are many reasons why it is importance to have a hobby.

                A                 B                          C                  D

3. My sister enjoys listening to music and sing with her friends.

                                   A             B               C     D

4. If you have a lot of coins, stamps, toys bottles or dolls, your hobby is painting.

                           A                                        B                                       C       D

5. Jim learned a lot since he started the language course.

              A                                 B                  C            D

1
10 tháng 11 2021

11  : bỏ is

−-  Cấu trúc :

−-  : S + find + V-ing / N +adj

⇒⇒  Bỏ is

22  : importance →→  important

−-  be + adj

−- important : quan trọng

33  : sing →→  singing

−-  enjoy+ V-ing + ( and ) + ( V-ing )

44  : painting →→ collecting

−-  Vì vế trước có nói : If you have a lot of coins, stamps, toys bottles or dolls

⇒⇒ Phải là collecting : thu thập chứ ko pk là painting : vẽ

55  : learned →→  has learnt

−-  HTHT + since : S + Have/ has + VPII + since + 1 mốc TG 

DHNBDHNB  : Since he started the language course.

10 tháng 11 2021

tyhgdwvjia

10 tháng 11 2021

qweqwewqeq

10 tháng 11 2021

1, doing.

2.collected.

3.is having.

4. Did/ wash- I did.

1. My brother’s taste in art is quite different _________ mine.  A. to B. from C. as D. than   2.  Have you ever taken part ________ volunteer work? A.in B. to C. for D.with 3. Our new car is smaller, so it uses________ petrol. A. more B. less C. fewer D. little 4. A: I don’t like the new soap opera on VTV6 now.  - B: I don’t like it, ________. A. too B. neither C. so D. either 5. The music festival will be at the _________ time as last year. A. same B. different C. more D. most 6. A...
Đọc tiếp

1. My brother’s taste in art is quite different _________ mine. 

 

A. to B. from C. as D. than  

 

2.  Have you ever taken part ________ volunteer work?

 

A.in B. to C. for D.with

 

3. Our new car is smaller, so it uses________ petrol.

 

A. more B. less C. fewer D. little

 

4. A: I don’t like the new soap opera on VTV6 now.  - B: I don’t like it, ________.

 

A. too B. neither C. so D. either

 

5. The music festival will be at the _________ time as last year.

 

A. same B. different C. more D. most

 

6. A ________ is a person who plays a musical instrument or writes music, especially as a job.

 

A. poet B. singer C. comedian D. musician

 

7. Hoa looks red. She was outdoors yesterday. Perhaps she has _______.

 

    A. flu B. spots         C. sunburn D. stomachache 

 

8. Water________  is a traditional art form and it began in the 11th century. 

 

A. puppeteer B. puppetry C. puppets D. puppeting 

giúp mình nhé .làm ơn

1
9 tháng 11 2021

37+5=     1+1tgtrhytyht6yhr6thfyhthy

?_?

@Nghệ Mạt

#cua

9 tháng 11 2021

1234567890QWERTYUIOPASDFGHJKLLLLLLLLLLLLLLZXCVBNM,

9 tháng 11 2021

n ( Cu) = 64

n ( H2) =2 => n(Cu)/n(H2)= 32

9 tháng 11 2021

gấp 32 lần nha bn 

 HT