Cho 16,2 g hỗn hợp gồm Fe và Na₂CO₃ t/d vừa đủ vs 200g dd HCl.Sau phản ứng thấy giải phóng 4,48 lít khí ko màu(đktc). Tính C% của axit HCl đã dùng

cho 18,6 g hỗn hợp A gồm sắt và nhôm oxit vào dung dịch hcl sau phản ứng thu đc dd B và 3,36 l khí ko màu(đktc0

a, vt PTHH và tính % khối lượng mỗi chất trog hôn hợp A

b, Cho dd B t/d vs dd natri hidroxit dư thu đc kết tủa C.Nung kết tủa C trog ko khí đếm khối lượng ko đổi thu đc m gam chất D.Tính m

protein bậc mấy thể hiện bản chất sinh học? vì sao?

chuyển sang câu bị động

1, jack has father do his homework

2, my father has me clean his bike

3, the worker are painting the house green

sử dụng từ gợi ý hoàn thành câu

86, it/necessary/students/wear uniforms/they/school

-- ___________________________

87, i/now/tired/since/i/stay/late/do/homework

--______________________________

88, know/how/use/computer/very important nowadays

--____________________________________

viết lại câu giữ nguyên ý

1, the flight to Moscow lasted three and half-hours

-- it took__________________________________

71, somebody repaired his car yesterday

-- he had__________________________________

74, i remember someone telling me the news

-- i remember being___________________________

75, i am very pleased that we shall meet again soon

-- i'm looking______________________________

cho dạng đúng của từ trong ngoặc

21, the new technology is very important if we want to have high______(economy) growth

22, _______(tradition),the Ao dai was worn by both men and woman

23, she has great ______(improve) in her writing English essays

27, it's _____(usual) cold today.Children are going to have a day off

28, there are ______(argue) about wearing uniforms at schools

29, BG is an _______(industry) city in the North of VN

30, everyday,the are two_______(fly) from DN to HCM city

fill in the blanks with the correct form of the words in capital letters

1, woman nowadays have more freedom to take part in social_____(act)

2, some_____singers earn a lot of money (profession)

3, don't be so_____.There's plenty of time

4, ____, you will be at a disadvantage if you can't drive (fortunate)

5, i am afraid you have_____me because that is not what i meant (understand)

6, freedom of______is one of the fundamental rights (speak)

7, the____are scheduled to take off at 15.00 and 15.30 (fly)

8, reading funny stories is an_____way to relax (enjoy)

9, the president's New Year Speech is going to be broadcast_____(nation)

10, it's______of you to say that.You know it isn't true ! (honest)

tìm 1 lỗi sai trong các câu sau và sửa lại cho đúng

1, the doctor suggested that the little boy took it easy for some days

2, i regret to tell you that you have not appointed to the post

3, my best friend is coming to HN to visit me in 19th July

4, Da Lat,where is located on High Land , is famous for its mild climate

5, it was such a good news that we could hardly believe that it was true

6, people are asked not cut a lot of trees for firewood

7, Mary usually arrives at the office at 9 o'clock , but because the storm,she was two hours late

8, if modern technology didn't exist , we will never have these precious pictures

9, the children are looking forward to go camping this summer vacation

10, most of the students seemed very nervously before the final exam

3, I won't let you go until I (tell)______the truth

7, how many times you (be)______to Van Mieu ?

8, have you decided what (cook)_____yet ?

9, the bridge (build)______during my holiday there last year . But it (not complete)______so far