gọi tên các muối sau: NaF, CuCI2, CaSO3, Ba(HCO3)2, KHSO4

Câu 1: Ở 25 độ C, khi hòa tan 20 gam NaCI vào 40 gam nước thì thấy có 5,6 gam NaCI không tan được nữa. Tính độ tan của NaCI ở nhiệt độ trên

Câu 2: Tính nồng độ phần trăm của dung dịch Al2(SO4)3, biết trong 2,5kg dung dịch có hòa tan hết 34,2 gam AI2 (SO4)3?

Câu 3: Tính nồng độ mol của dung dịch CuSO4, biết trong 4 lít dung dịch có hòa tan hết 400 gam CuSO4?

Câu 4: Trong phòng thí nghiệm có sẵn một dung dịch NaCI và các dụng cụ, thiết bị có sẵn. Em hãy trình bày cách xác định dung dịch NaCI này là bão hòa hay chưa bão hòa

task 3: complete the sentences with by or until / till brackets

1. I will keep asking ____ you accept my offer

2. The bank should be open ___ 5 o'clock today

3. We must finish our project ___ next Friday

4. ___ the time she arrived, the meeting had already begun

5. According to the weather forecast, it will keep snowing ___ the weekend

6. According to the weather forecast, it should finally snow ___ this weekend

7. I need this work finished ___ tomorrow morning

8. Can you look after the baby ___ I get back

9. Make sure to return home ___ 9 o'clock

10. Sandra is going to have my car ___ the weekend

11. Sandra promised to bring back my car ___ Sunday afternoon

12. Don't do anything ___ the back up arrives

13. I will have been married for ten years ___ 2020

14. ____ what time are you open today?

15. Learning English was difficult ___ I came across this website

Task 4. Complete the sentences with by or untill / till brackets

1. Tomorrow the sun ( rises / is rising ) at 6.44 and it ( sets / is setting ) at 18.33

2. I ( don't do / am not doing ) anything tonight. I want to relax

3. What time ( do you meet / are you meeting ) John on Sunday?

4. This years the school ( ends / is ending ) on 28 June

5. After the reconstruction, the supermarket ( opens / is opening ) on Monday again

6. I can't help you. I ( see / am seeing ) the doctor this afternoon

7. We've already booked our holiday. We ( go / are going ) to Rome in May

8. Could you meet us at the airport tomorrow morning? The plane ( lands / is landing ) at 10.15

9. The piano concert ( doesn't start / is not starding ) at 8 o'clock. It's cancelled

10.( Do you have / Are you having ) your birthday party this week or next week? I forgot

bài 5: thực hiện phép tính

a) ( x + 3y ) ( x - 2y )

b) ( 2x - y ) ( y - 5x )

c) ( 2x - 5y ) ( y^2 - 2xy )

d) ( x - y ) ( x^2 - xy - y^2 )

Bài 2: tính 

a) 2a + 4b + ( -4b + 5a) - (6a - 9b)

b) 6a [b + 3a - ( 4a - b )]

WRITE SENTENCES USING THE PROMPTS

1. not/enough/thing/do/country

2. lots/public/transportation/Castleford

3. not/much/noise/Shine Village

4. too/much/pollution/my city

5.too many/vehicle/city center

B. WRITE SENTENCES USING THE PROMPTS

1. my town/not/have/enough/entertainment

2. this city/have/much/pollution

3. there/many/vehicles/my street

4. there/lot/room/people/play/my city

5. there/not/many/things/do/my village