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nammilo2003
2 năm trước
Viết phương trình phản ứng: 1.Sục từ từ đến dư CO2 vào dd nước vôi trong; dd NaOH 2.Cho từ từ dd axit HCL vào dd Na2CO3
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Các câu hỏi liên quan

I. Choose the word having the underlined part pronounced differently 1. A. station B. mistake C. lane D. many 2. A. ready B. break C. ahead D. head 3. A. freight B. vein C. ceiling D. neighbor 4. A. pretty B. depend C. left D. expensive 5. A. straight B. pain C. said D. afraid 6. A. plane B. narrow C. nation D. brake 7. A. left B. step C. forget D. water 8. A. mistake B. relation C. machine D. indicate 9. A. helpful B. receive C. expect D. repair 10. A. decade B. language C. traffic D. damage II. Fill in each blank with ONE word below ride – bus stop – allowed – zebra crossing – illegal – play – obey – foot – from – pond 11. It is not too far from here to the nearest __________. You can walk there to catch a bus. 12. You can go to opposite side of the street by waking at the __________. 13. When I was a child, I used to swim in the __________ near my house. 14. I used to __________ marbles all the time when I was young. 15. It is about 500m __________ here to the nearest shopping mall. 16. I don’t think that we can __________ bicycle here because there is a road sign of not cycling. 17. It is __________ to drive on the left in Vietnam. 18. You are not __________ to ride motorbikes without wearing a helmet. 19. You must __________ the traffic rules for your safety and other road users. 20. I often go to school on __________ to keep fit.

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