1)CaO+HNO3-Ca(NO3)2+H2O

2)AlCl+NaOH-Al(OH)3+NaCl

3)Cu(NaOH-Cu(OH)2+LiNO3

4)SO2+O2-SO3

5)C2H10+O2-CO2+H2O

6)C2H5OH+O2-CO2+H2O

7)CO+O2-CO2

8)P+Cl-PCl3

9)Na+O2-Na2O2

10)Al+O2-Al2O3

Расставьте коэффициенты.

Ex. 2. Put the verbs in brackets into the past simple or the present perfect simple. 1. A. I went (go) to the new gym yesterday. B. It's good, isn't it? I ... (go) there a few times. 2. A. ... (you/write) to Simon lately? B. Yes, I ... (write) him a letter last week. 3. A. How long ... (you/be) married? B. Only six months. I ... (get) married last December. 4. A. I ... (not/see) Sam for a long time. B. Really? I ... (see) him yesterday at the swimming pool. 5. A. ... (you/type) the report yet? B. Yes, I ... (finish) it half an hour ago. 6. A. Mary ... (know) Steve for six years. B. When ... (they/meet)? 7. A. ... (you/ever/play) rugby? B. When they ... (be) at university together. 8. A. James ... (write) a new book last year. B. I know. I ... (read) some great reviews about it in the newspaper.