Người ta dùng 12 g khí hydro để khử 480 g SE2O3. Sau phản ứng thu được chất rắn và nước

a) Tính khối lượng chất dư sau phản ứng

b) Tính khối lượng sắt tạo thành

c) Chất dư được cho tác dụng với HCL. Tính khối lượng muối tạo thành

Write the correct tense of form of the verbs in brackets.

1. He … (receive) £300 when his uncle died.

2. The day we heard the news we … (have) holidays with our family.

3. Why … (you/not answer) my phone call last night? ~ Oh, sorry, I … (take) a shower at that time.

4. She … (not see) her father since he …

(start) to work in Marseille two years ago.

5. My mother … (fly) home from London today. Her flight … (arrive) in an hour.

Choose the underlined word or phrase, A, B, C or D that needs correcting

1. The beloved tale of Cinderella is one of the world’s best - known fairy tale, renowned as a ‘happily ever after’ story.

2. Little Red Roding Hood’s mother sent her to Grandma’s house with a basket of goodies and told her to not talk to strangers.

3. Snow White’s evil stepmother wanted to be more beautiful in the land and was jealous of Snow White’s beauty.

4. The fog turned into a handsome prince, married the princess and they lived happily after ever.

5. The Hare ran across a field as fastly as he could, and all the animals agreed that the Hare was very fast.

Choose the best answer a, b, c or d complete the sentences

1) The tale is about a prince who is turned ... a frog by his wicked stepmother

a.

Complete the sentences with the past simple or past continuous form of the verbs in the brackets

1) My car ... (break) down when I ... (drive) home from work

2.Alan.......(look) out of the window when he.......(see) a UFO

3.When he.......(see) me, he.........(fall) of the wall

4.We.......(try) to log on when the Wifi .......(stop) working

5........Jim.......(smoke)when he.......(turn) on the gas?

6.She......(be) so tired that she......(sleep)for twelve hours

7.The tortoise..........(run)while the hare..........(have) a nap

8.I.........(phone) you four times last night but you..........(sleep)

9.The police.......(ask) them lots of questions before they.......(release) them

10.While the children......(surf) the Internet,they.......(find) a really interesting website about music

11.He........(walk) down the road when he.......(hear)a lound noise

12.When we.......(be) in Canada,we.......(go) skiing almost every day

13.Where......you.....(go) last summer holiday,Jim?-Well,I.......(take) a trip to Minneapolis

14.When I.......(arrive),they.......(say) hello but continued working

15.When you......(meet) me yesterday,I......(not go) to school,I.......(go) to the doctor's-I felt terrible

Trên các cạnh AB, BC, CD, DA của hình bình hành ABCD, lấy theo thứ tự các điểm E,M,N,F sao cho BM = DN, BE=DF. Gọi I,O,K theo thứ tự là trung điểm của EF, BD, MN.

a. C/M I,O,K thẳng hàng

b. Trong trường hợp nào thì cả 5 điểm A,I,O,K,C thẳng hàng

Cho 6g kim loại Magie vào dung dịch Axit clohidric thu được Magie Clorua và khí hydro

a) Viết PTHH

b) Tính thể tích hydro thu được ở đktc

Đốt cháy hoàn toàn 7,2 g magie tạo thành magie oxit. Tính khối lượng magie oxit thu được sau phản ứng