a) Đốt cháy 12g Natri trong bình chứa 4480ml khí oxi tạo ra Natrioxit. Sau phản ứng chất nào còn dư, tính khối lượng chất dư. b) Tính khối lượng Natrioxit tạo thành c) Tìm khối lượng KMnO₄ đủ để điều chế oxi cần dùng cho phản ứng trên.

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I. Circle the correct words. 1. Chop up the strawberries and put him / them / it here. 2. That girl is lost. Let’s help us / her / him. 3. Listen to that music. Can you hear them / her / it? 4. I can’t find Tom. Can you see him / me / you? 5. I’ve lost my map. Can you show me / it / them the way? 6. We want to make smoothies. Please help them / us / her. II. Match problems 1-9 and advice a-i. Write sentences with “should” or “shouldn’t”. 1. I can’t study for my exams. 2. I’m getting fatter. 3. I’ve got a headache. 4. I haven’t got any money. 5. I’ve got a cold. 6. I’ve lost the tickets. 7. I haven’t got any energy. 8. I’ve got a sore throat. 9. I think the lessons are difficult. a. Look for them. b. Drink some hot lemon. c. Sit in the library. d. Do more exercise. e. Drink more water. f. Get a job. g. Talk to your teacher. h. Eat something. i. Don’t talk. 1. C You should sit in the library. 2. ___ ___________________________ 3. ___ ___________________________ 4. ___ ___________________________ 5. ___ ___________________________ 6. ___ ___________________________ 7. ___ ___________________________ 8. ___ ___________________________ 9. ___ ___________________________ III. Choose the best answer. 1. Your garden is larger than .. ours... ( us / our / ours ) 2. Would you mind ...................the dog out? ( letting / to let / let ) 3. Why are you always arguing with .......................? ( other / each other / another ) 4. Would you like ...............my hoilday photos? ( seeing / to see / see ) 5. I’ll give to her when she .................back. ( comes / will come / has come ) 6. The weather is ....................today than it wasyesterday. ( good / better / best ) 7. They haven’t seen each other ...............they left school. ( after / for / since ) 8. I think Holland ................win the World Cup. ( is going to / will / won )