1.what english-speaking country wwould you like visit most?

2.what do you like most about the usa?

3.if you had a chance to visit england, what would you like to see and do there?

4.would you like to study in an english-speaking country in the future?why(why not)?

5.what are some common natural disaters in vietnam?

6.when do storms often happen in your country?

7.in your opinion, what are some causes of natural disasters?

8.what should we do to prepare for natural disasters?

9. what can we do to help victims of a flood?

hòa tan oxit R2On vào dd h2so4 10% vừa đủ thu được dung dịch muối có nồng độ 12,90%. xác đinh cthh của oxit 

1.do you think that pollution is a serious problem nowadays? why(whynot)?

2. what types of pollutions does your neighborhood face?

3. what are the major causes of air pollution?

4. can you name some effects of water pollution?

5. what can you do to prevent noise pollution?

6.could you name some english-speaking countries?

có hỗn hợp A gồm al2o3 fe2o3 chia A thành 2 phần bằng nhau.

phần 1 phản ứng với 100ml dd naoh 2m

phần 2 pư với h2 dư tạo ra 10,8 gam h2o

tính % khối lượng mỗi oxit trong hỗn hợp A