Thực hiện thí nghiệm điều chế khí X, khí X thu được vào bình tam giác theo hình vẽ bên.

Thí nghiệm đó là

A. Cho dung dịch H 2 S O 4 loãng vào bình đựng hạt kim loại Zn.

B. Cho dung dịch HCl vào bình đựng bột  C a C O 3 .

C. Cho dung dịch HCl đặc vào bình đựng tinh thể K 2 C r 2 O 7 .

D. Cho dung dịch  H 2 S O 4  đặc vào bình đựng lá kim loại Cu.

k giải tóa oy nên bn ko phải lo về câu tl nha:

1) {1;3;7;9}

2) {0;1;4;5;6;9}

3) {-5;2}

For question 36-45, read the text. Use the words given in CAPITALS to form a word that fits in the numbered gaps. There is an example at the beginning (0). Write your answer on YOUR ANSWER part.

It is sometimes said that your schooldays are the (0. happy) days of your life, and people often feel that this should be a period of (36. ENJOY)enjoyment. However, exams often affect students’ happiness, and many students express a (37. PREFER)preference for alternative methods of assessment, where the work they do throughout the year counts towards their final mark. They say that exams test short-term memory and (38. KNOW)knowledge which is forgotten immediately after the exam. Also, assessing coursework as part of the final marks changes students' (39. BEHAVE)behaviour; making them more (40. RESPONSIBILITY)responsible about studying. There are some students, however, who prefer final examinations, saying that in (41. COMPARE)comparement they only have to work hard for two months a year and so they have more time for their leisure (42. ACT)activities. They say that some students receive (43. ASSIST)assistances with their coursework from their parents, so it is not an accurate (44. MEASURE)measuring of how hard they have worked or of their real (45. ABLE)ability in the subject they are studying.

thay thế các từ đại từ in ngiêng

1) I see Minh->he everyday

2) Mai attends the University->it

3) The student like Mai->she

4) The news is about Lan->she

5) I like those people->they very much

6) The teacher is explaining the lesson to the students->it to them

My sister is good for->at geography

error correction

1. It's not easy find->to find a cheap apartment in HCM city

Giá trị của biểu thức P = (3x – 1)(2x + 3) – (x – 5)(6x – 1) – 38x là

A. P = -8

B. P = 8

C. P = 2

D. P = -2

Read the passage and decide if the statements are true or false

Hi. I’m Lan. I’m eleven years old. I’m a student. This is my father. His name’s Ha. He’s a teacher. He’s forty years old. This is my mother. Her name’s Nga. She’s thirty – five. She’s a teacher, too. This is my sister, Hoa. She’s fifteen. She’s a student. I’m her brother.

Question: Lan is a student.

A. True

B. False