Bài 2: Đốt cháy hoàn toàn 1,8g một ankan, người ta thấy trong sản phẩm khối lượng CO2 nhiều hơn khố lượng H2O là 2,8g

1. Xác định công thức phân tử của ankan đó.

2. Khi cho ankan phản ứng với clo ở 25oC và có ánh sáng chỉ thu được một sản phẩm thế duy nhất. Gọi tên ankan và vết PTPƯ.

Bài 1: Viết công thức cấu tạo thu gọn của các hợp chất sau:

1. 3-etyl-2,3,4-trimetylheptan

2. 3,4-đietyl-2,3,3-trimetyloctan

SỰ HÒA HỢP CHỦ NGỮ VÀ ĐỘNG TỪ

I.ĐỘNG TỪ CHIA Ở DẠNG SỐ ít

II.ĐỘNG TỪ CHIA Ở DẠNG SỐ NHIỀU

III. CHIA SỐ ÍT HAY NHIỀU

Ex:

Three weeks ...........not enough for holiday

A. are B. were C. was D. been

2. Each of you ........a share in the work

A. having B. has C. to have D. have

3. Ten pounds ........too much to pay

A. is B. being C. are D. were

4. A number of students..................volunteered to the job

A. have B. has C. to have D. having

5.Linguistics..........out the ways in which languages work

A. find B.finding C.to find D.finds

6. Tom doesn’t agree but the rest of us..............

A. does B.done C.do D.doing

7. There ..........a few flowers in this garden last summer

A. being B. were C.are D.is

8. A lot of her furniture in her room..........new

A. are B. be C. were D. is

9. The United Nations.............its head quarters in New York city

A. have B. having C. has D. to have

10. Statistics ............... a branch of mathematics

A. being B. were C. is D.are

III. Writing:

A.Change these sentences into passive voice:

1. Government must eliminate hunger as soon as possible.

=>Hunger...........

2. Parents shouldnt allow children to play violent games.

=>Children..........

3. You must wash your hands before meals.

=>Your hands......

B.Rewrite the sentence, using the superlative form of the adjectives given.

4.Mount Everest is higher than every mountain in the world.(high).

=> Mount Everest ......

5.My grandmother is older than everyone in my family.(old)

=> My grandmother is the............

HElP ME

I/ Phonetics

*Choose the word whose underlined part is pronounced differently from the others:

1. A. women B.college C.opportunity D.job

2. A. eliminated B.forced C.worked D.missed

II/ Grammar and vocabulary: Choose the best answer

3. You . wear a safety helmet when riding your motorbike. Its the law.

A. should

B. could

C. must

D. can

4. Genderis the equal treatment among men and women.

A. equality B. education C. discrimination D. mistake

5. Young children . go in the swimming pool without an adult.

A. must

B. have to

C. dont have to

D. must not

6. Gender discrimination in.................makes it difficult for women to do mens jobs.

A. education B. employment C. race D. entertainment

7. He is very intelligent. He . do all math exercises easily.

A. can B. should C. must D. may

8. .. man should take off his hat when he goes into . house in the UK.

A. A the B.A -a C. The a D. The the

9. When you stay at .. friend's house, you should write. thank-you note.

A.a -a B. the - a C. a - the D. the - the

10. The bad weather couldnt prevent us____________winning this competition.

A. of B. from C. with D. to

III. Writing:

A.Change these sentences into passive voice:

1. Government must eliminate hunger as soon as possible.

=>Hunger.

2. Parents shouldnt allow children to play violent games.

=>Children

3. You must wash your hands before meals.

=>Your hands

B.Rewrite the sentence, using the superlative form of the adjectives given.

4.Mount Everest is higher than every mountain in the world.(high).

=> Mount Everest

5.My grandmother is older than everyone in my family.(old)

=> My grandmother is the

Câu 1:Dùng một bếp điện đun sôi một lượng nước. Nếu nối bếp với hiệu điện thế U₁ = 200v thì thời gian nước sôi là t₁=5 phút. Nối bếp với hiệu điện thế U₂=100v thì thời gian nước sôi là t₂=25 phút . Hỏi hiếu nối bếp với hiệu điện thế U₃=150v thì thời gian nước sôi t₃ là bao nhiêu? Cho nhiệt lượng hao phí tỉ lệ với thời gian đun nước.