câu 1:cho 19,4 gam hỗn hợp kim loại Zn và cu tác dụng với dd hcl dư sau phản ứng thu đc 4,48 lít khí h2

 a, viết pthh 

 b, tính khối lượng mỗi kim loại trong hỗn hợp ban đầu 

c, tính thành phần phần trăm khối lượng mỗi kim loại trong hỗn hợp ban đầu

cho biết Zn=65,Cl= 16,Cu=64

câu 3: Một xe khách và một xe tải xuất phát cùng một lúc đi từ tỉnh A đến tỉnh B. Mỗi giờ xe khách chạy nhanh hơn xe tải là 5 km nên xe khách đến B trước xe tải 30 phút. Tính quãng đường A B, biết rằng vận tốc của xe tải là 40 km/h.

Câu 4 : Cho hình chữ nhật A B C D có AB = 8cm, BC = 6cm. Gọi H là chân đường vuông góc kẻ từ A xuống BD, phân giác của  cắt B D ở E.

1) Chứng minh: Tam giác AHB đồng dạng tam giác BCD.

2) Chứng minh AH.ED = HB.EB.

3) Tính diện tích tứ giác AECH.

Câu 5 :Cho số a= (10 ²⁰¹⁵ - 1 ²) ^, hãy tính tổng các chữ số của a.

giúp mình phần toán!!!!!!!!!!!!!!

Question II. Give the correct form of the words given to complete the sentences. 

1. The ……………… are concerned about the oil spills in East Sea. (environment)

2. Scotland is a ……….. land and this is noted for its rich and interesting history. (legend)

PART FOUR: READING (2.5 pts)

I. Read the passage and fill in each gap with a suitable word. 

Telepathy: Mind to Mind Communication

The (1) …………… “telepathy” has been derived from the words “tele” meaning “distance” and “pathy” meaning “feeling”. So telepathy actually means getting feelings through a distance. Telepathy is the communication (2) …………. two minds, separated over a distance, without the (3) …………… of the five known senses. At some point of time or the other, we all have experienced telepathy. Maybe you were thinking of someone you haven’t talked to for months and you suddenly get a call from them. Or (4) ………….. two people are together, they might say the same thing at the same time. These are spontaneous mind-to-mind (5) …………… that tend to occur frequently between closely related individuals.

II. Read the passage then answer the questions: 

Alaska is perhaps the most amazing state in the USA. It has coaslines facing both the Arctic Ocean and the Pacific Ocean. This state has an incredible three million lakes. That’s four lakes per person living there. Many cities in Alaska cannot be reached by road, sea, or river. The only way to get in and out is by air, on foot, or by dogsled. That’s why Alaska has the busiest sea airport in the world, Lake Hood Seaplane Base. Nearly two hundred floatplanes take off and land on the water of this airport every day. It’s really a fun scene to watch. Alaska is called the Land of Midnight Sun because in summer, the sun does not set for nearly three months. But in winter the sun stays almost unseen. All Alaskans take special pride in their beautiful and unique state.

1. Where is Alaska ?

…………………………………………………………….…………….

2. Does it have three thousand lakes?

……………………………………………….……………

3. Which method can always be used to reach a place in Alaska?

……………..……………..

4. Why is Alaska called the Land of Midnight Sun?

………………..……...………………….

5. How do the people in Alaska feel about their state?

………………..…..………………

PART FIVE: WRITING 

I. Rewrite these sentences, so that their meaning stays the same, using the beginning given for each.

1. Nhung didn’t go to the cinema with her friends because her younger sister was ill.

Because of …… ………………………………………..………………………………………

2. The earthquake struck the city and destroyed completely thousands of buildings and houses.

The city …………………………………………………………..………………………………

3. Who wrote this poem in the 19th century?

By whom ………………………………………………………………..………………………?

4. Minh isn’t hardworking, so he often gets bad marks.

If ………………………………………………………………………………..……….……….

II. Combine each pair of the following sentences into one, using the suggested words or phrases in the brackets. 

1. I’m not you. But I think you should recycle these plastic carrier bags. (If)

………………………….……………………………………………

2. All flights had to be cancelled. That’s because of the pilots’ sudden strike. (so)

………………………….……………………………………………

3. The environment is polluted. Birds and plants die. (cause)

………………………….……………………………………………

4. The food is contaminated. People’s health is poor. (lead to)

………………………….……………………………………………

có bạn nào giúp mình với !!!!!