Bài 2:
Lập sơ đồ nguyên tử và cho biết số phân tử mỗi chất sau phản ứng hóa học Cho sơ đồ của các phản ứng sau:  
a.Na + O2 → Na2O  
b.P2O5 + H2O → H3PO4 
c.HgO → Hg + O2 
d.Fe(OH)3 → Fe2O3 + H2O 

Bài 1:
a) CuO +     Cu     →       Cu₂O
b) FeO +     O₂     →     Fe₂O₃
c) Fe           +       HCl    →      FeCl₂    +                        H₂
d) Na          +       H₂SO₄         →     Na₂SO₄       +       H₂
e) NaOH     +       CuSO₄        →      Cu(OH)₂     +       Na₂SO₄
f) Na₂CO₃   +       Ca(OH)₂     →      CaCO₃        +       NaOH
Lập các PTHH ?

Supply the correct form and tense the verbs in the brackets.
1. She (have)___________ coffee for breakfast every morning.
2. This is my house. ~How long________ you (live)_________ here? ~I (live)______________ here since 1970.
3. There (be)___________ 20 rooms in my future house.
4. Be careful! The baby (sleep) ____________________.
5. If he (eat) all that he will be ill
6. I ( meet )_____________her at the movie theater last night.
7. My mother ( make ) ___________ a dress now.
8. Two years ago, she ( teach ) _________at a village school.
9. What ________you (do) ________ yesterday morning?
10. We (not travel ) _____________to Hue next month.
11. She never ( stay ) _____________up late at night.
12. My mother ( plant ) ___________ flowers in the garden at the moment.
13. _______Minh ( go ) ________ to the dentist tomorrow morning?
14. Michael ( play) _____________the piano since he ( be ) _____________three.
15. If we leave the car here it (not be) _________in anybody's way.
16. He'll be late for the train if he (not start) _______ at once.
17. If you come late they (not let) _________you in.
18. If he (go) _______ on telling lies nobody will believe a word he says.
19. If he (work) _________hard today, can he have a holiday tomorrow?