Với H ở đây tên gọi chính xác là gì mọi người nhỉ? Cho 158g KMnO4 có lẫn 20% tạp chất. Phản ứng với lượng dư dung dịch HCl với H = 60%. Sau phản ứng thu được V lít khí Cl2 (đktc).

Name:………………………. HOMEWORK ( No1- week 2) Class: 8……. Mark Teacher ‘s comment A. PHONETICS I. Choose the word that has the underlined part pronounced differently from the others. 1.​A. paddy​B. sand​C. travel​D. tribal 2.​A. buffalo​B. photo​C. limestone​D. botanical 3.​A. jungle​B. luggage​C. sunbathe​D. sugar 4.​A. around​B. various​C. sound​D. mountains 5.​A. heritage​B. giant​C. garden​D. village B. VOCABULARY AND GRAMMAR II. Complete the sentences, using the correct form of the words in brackets. 1.​People believe that the ​​​ water has brought cancer to the local residents. (pollute) 2.​Light pollution make us ​​​ to see the stars in the sky. (able) 3.​Noise is considered as ​​​ pollution. (environment)​​ 4.​​​​ habitats have been destroyed in recent years. (nature) 5.​A number of cleaning products contain ​​​ chemicals. (harm) 6.​Water samples collected at these villages were seriously​ ​​​ with bacteria. (contaminate) 7.​An ​​​ of agrochemicals is pesticides. (illustrate) 8.​Contaminants are usually ​​​ to aquatic plants. (poison) 9.Water ________________ in the lake has made the fish die. (pollute)​ 10. Water pollution is the _________ of body water of lake, river, oceans.(contaminate) III. Complete the sentences with the correct verb form in the bracket. 1.​If someone offered to buy you one of those rings, which you (choose) ​​​? 2.​The flight may be cancelled if the fog (get) ​​​ thick. 3.​If the milkman (come) ​​​, tell him to leave two pints. 4.​I (call) ​​​ the office if I were you. 5.​Someone (sit) ​​​ on your glasses if you leave them there.

hay so sánh phần tram khối lượng của cacbon trong các chat sau CH4,CH3CL,CH2,CL2

cho tam giác ABC vuông tại A (AB<AC) KẺ AH vuông góc với BC tại H gọi K là điểm nằm trên đoạn HC sao cho HK=BD , D là điểm trên tia AH sao cho H là trung điểm AD cminh a, tam giác ABH =tam giác DKH b, AK // BD c, AK vuông góc CD giúp mình nhanh với ạ

15-(4-x)=6;-30+(25-x)=-1. Giúp mình đi mấy bn

Nêu sự đa dạng của loài bò sát.

Từ đồng nghĩa với từ "son" trong bài thơ "Bánh trôi nước" là gì?

IV. Underline the correct answers. You want to do sport, but you don’t know which sport to choose. (1) Gymnastics/ Surfing/ Skiing is fun, but it’s expensive and you can only do it in winter. Cycling is good exercise, but you must buy a (2) racket/ bicycle/ net and a (3) helmet/ swimming cap/ skateboard. How about (4) bowling/ running/ scuba diving? It doesn’t cost any money and you can do it any time and any place. You only need some good trainers, some comfortable clothes - and the Runkeeper smartphone app. With this app you can see your distance and your speed. Do you prefer to exercise at a sports club? You don’t need an expensive personal trainer. You can use Runkeeper while you are (5) cycling/ surfing/ weightlifting on an exercise bike or while you are jumping and kicking in a (6) karate/ volleyball/ basketball lesson. You can’t lose with this incredible app! VI. Turn the sentences into negative and interrogative forms. 1. They were in Rio last summer. 2. We did our exercise this morning. 3. My parents came to visit me last July. 4. The hotel was very expensive. 5. I had a bicycle when I was young 6. The children went to the zoo yesterday.

Giups mình với! đốt chay hoàn toàn 7,2 hidrocacbon thu được 10,8g H2O tìm công thức phân tử

Lm giúp mk câu b + câu c và bài 3 ak