I. Find and correct one mistable

1.We have played soccer since two hours .
=> for

2. I don't work in sunday morning .
=> on

3. He can play the piano when he was 12
=> could

4. The car who he bought last week is so expensive
=> which

5. The dentist which filled my teeth yesterday is kind.
=> who

II. Re write the sentences

1. My brother can play fooball well .

- My brother is ..a good football player.......

2. The fridge doesn't work .I bought it last week

- The fridge.. .which I bought last week doesn't work. .......

3. That's the nurse .She helped me a lot .

- That's ....nurse who helped me a lot........

1.I won't hang these old pictures in the living room
=> These old pictures won't be hung in the living room.

2.We will use sources of energy more effectively for our future
=> Sources of energy will be used more effectively for our future.

3.the students in my school will use public transport when traveling long distance
=> Public transport will be used by the students in my school when travelling long distances.

a. Choose the best answer (A, B, C or D) to complete each sentence. (15 pts)

1. In the jar, there was a ____ which looked like jam.

A. substance B. material C . solid D. powder

2. Would you care for ____ cup of tea?

A. another B. more C. one other D. some more

3. Let's practice the game, ____?

A. will you B. us C. do we D. shall we

4. ____ we came late, we missed the first part of the film.

A. Since B. Although C. For D. Because of

5. ____ we were tired, we sat down beside the stream.

A. And B. Because of C. If D. As

6. The prices of homes are ____ high in urban areas that most young people cannot afford to buy them.

A. as B. so C. such D. so as

7. Over ____ past few decades, ____ schools in the USA have been testing various arrangements.

A. the / x B. x / the C. a / the D. x / x

8. I can't stand the car ____ Therefore, I hate traveling by car.

A. sickness B. illness C. disease D. tiredness

9. The old lady can't see very well. She needs ____ to take her across the street.

A. anybody B. somebody C. nobody D. everybody

10. We don't visit you very often because you live so ____.

A. away far B. further C. far away D. away

11. He moved the TV antenna ____ he could get a clearer picture.

A. because of B. in which C. so which D. so that

12. John decided ____ golf on weekends.

A. to begin B. to commence C. to take up D. to start up

13. You had better ____ the tourist information office.

A. inquire at B. inquiring at C. inquire to D. inquiring at

14. We will serve our guests soon. We had better ____ now.

A. have table set B. set table C. setting table D. set the table

15. I will stay in the Golden Hotel in New York. Why don't you ____?

A. visits B. visit in C. drop in D. call in

Nguyên tử X có tổng số hạt là 46 :
\(\Rightarrow p+n+e=46\left(hạt\right)\)
\(\Leftrightarrow2p+n=46\left(hạt\right)\) \(\left(1\right)\)
Số hạt không mang điện bằng \(\frac{8}{15}\) tổng số hạt mang điện:
\(\Rightarrow n=\frac{8}{15}.2p\Rightarrow n=\frac{16}{15}p\left(2\right)\)
Thay (2) vào (1) ta có:
\(2p+\frac{16}{15}p=46\)
\(\Rightarrow p=e=15\left(hạt\right)\)
\(\Rightarrow n=16\left(hạt\right)\)
\(p=15\Rightarrow\) X là nguyên tố Photpho (P)

a. Các chất tác dụng với khí oxi:
\(4Na+O_2-t^o->2Na_2O\)
\(2Cu+O_2-t^o->2CuO\)
\(2SO_2+O_2-t^o->2SO_3\)
\(CH_4+2O_2-t^o->2H_2O+CO_2\uparrow\)
b. Các chất tác dụng với khí hidro:
\(Fe_2O_3+3H_2->2Fe+3H_2O\)
\(SO_2+2H_2-t^o->2H_2O+S\)
c. Các chất tác dụng với nước:
\(2Na+2H_2O->2NaOH+H_2\)
\(SO_2+H_2O->H_2SO_3\)
\(CaO+H_2O->Ca\left(OH\right)_2\)
d. Tác dụng với dd HCl:
\(2Na+2HCl->2NaCl+H_2\uparrow\)
\(Fe_2O_3+6HCl->2FeCl_3+3H_2O\)
\(CaO+2HCl->CaCl_2+H_2O\)