hòa tan hoàn toàn 10g CaCO3 vào dd HCl 7,3%

a) PTHH

b) Tính thể tích khí CO2 thoát ra ở đktc

c) Tính nồng độ phần trăm của dd muối CaCl2

He (phone)…………………….. me if he knows my number.

2. Please call the doctor If your son (have)……………………….. a temperature.

3. If you don’t study your lesson, you (have) ………………………poor marks in the examination

4. If Son passes his exam, he (go) ……………………………to University.

5. What you (do)………………………. If you are free?

6. If they (not miss) ………………………the first train, they can go with us.

7. I’ll come to see you If I (have)……………………………….. spare time

8. If I (have)…………………….. money, I (travel)……………………… a round the world.

9. If you want to improve your English, we (can) ……………………….help you.

10. He (must pass)……………….. the coming written test If he (attend)………………………. the course.

11. What you (do)………………………… If you (have)………………… free time?

12. If you come late, they (not let)…………………….. you in.

13. Carol and I are friends. I (know)…………………….. her since I (be)………………… a freshman in high school.

14. Let him (do)……………… what he wants.

1. You often (see)……………………. your parents?

2. We (not try) ………………………….our best to study yet.

3. Last night , the fire (break) ……………..out while everybody (sleep)………………...

4. I think she (leave)………………….. as soon as she gets the new.

5. This house (buy) …………………10 years ago.

6. My brother (work) …………………in this factory since 1989.

7. He used (play) ………………..football when he (be) ……………….10 years old.

8. What (happen)………………….. to you yesterday?

9. At present, that author (write)………………… a historical novel.

10. Up to the present, George (do)………………… good work in this class.

11. She wishes his father (be) ……………….here now to help here.

12. If you (be)………………… busy, I’ll help you.

13. You (finish)………………. your homework yet?

14. He wishes he (can) ………………..go abroad.

15. He would pass the examination if he (work)…………………… harder.

16. The house was dirty because it (not clean) ……………….since last week.

17. My family (live) ………………..in HCM city for 10 years.

18. What you (do)………………. if you won the lottery?

19. This room (paint)………………… since last week/

20. She asked her son (not stay) ………………up late.

21. Please stop (ask) ………………I question!

22. Do you hear someone (call) ………………..for the help in the distance?

23. My father told his children (try)……………………… to study to get scholarship.

24. What time will you finish (study)………………….. today?

25. It’s very interesting (go) ………………for a walk with the fresh air.

ở ngô 2n=20. 1 tế bào ngô đag ở kì sau của nguyên phân, vậy số NST trong tế bào đó là bao nhiêu

Khử hoàn toàn 11,6g một oxit sắt chưa rõ công thức phải dùng hết 4,48l khí H2. Tìm công thức oxit sắt