Bai 1:Hon hop A gom khi H₂ va khi O₂ ti khoi so voi khi H₂ = 8,5.Tinh % the tich va % ve khoi luong cac chat co trong hon hop A

Xin loi vi viet ko dau

Bài 1: Hỗn hợp X gồm : N₂,O₂,CO₂. Tỉ lệ số mol tương ứng là 1 : 2 : 1

a)Tìm khối lượng X biết  V_x(đktc)= 8,96 l

b) d X:H₂

V.  Complete the sentences with the past simple or past continuous form of the verbs in 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) off 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 loud noise.

12. When we _____________(be) in Canana, 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.

III. Choose the word whose underlined part is pronounced differently from the others.

1.      a. eyes                  b. ogres                      c. stories                    d. cakes

2.      a. walked             b. filled                      c. swallowed             d. screamed

3.      a. fable                 b. brave                      c. dragon                    d. tale

4.      a. scream              b. read                        c. reach                      d. hear

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