phân hủy 9,48g Kali penamanganat cho đến khi phản ứng xảy ra hoàn toàn
a) viết PTHH xảy ra
b) tính thể tích khí oxi thu được ( ở đktc) sau phản ứng
c) dùng lượng khí oxi tạo thành trong phản ứng trên để đốt cháy 1,6g lưu huỳnh. tính thể tích khí lưu huỳnh ddioxxit ( ở đktc) tạo thành
điền một giới từ vào chỗ trống:
1. phong nha cave in viet nam is known ... a world heritage site
2.the eiffel tower was designed ... a french engineer ... paris world's fair ... 1889
3.coming to our area, visitors can take guided tours ... the jungle or swim ... the blue sea
4. we have just returned ... a trip to hue citadel
5. in our place it is very cold ... night but it's warm ... the day
6. the lucturer is talking ... the great wall of china
sắp xếp những từ sau thành câu hoàn chỉnh:
1. feel/ sail/ friends/ father/ enough/ his/ my/ with/ go/ brother/ well/ not
2. because/ break down/ the airport/ miss/ car/ mr. binh/ the way/ his/ on/ the flight
3. leave/ not/ uncle/ binh duong/ since/ i/ for/ your/ meet/ he
4. noiser/ interesting/ the countryside/ than/ living/ more/ in/ be/ live/ in/ the city/ but
5. enjoy/ here/ go/ you/ or/ do/ move/ you/ stay/ be?
sắp xếp những từ sau để viết thành câu hoàn chỉnh :
1.said/ most/ the class/ be/ intelligent/ he/ in/ to/ the/ is/ student
2. tailor/ new/ go/ clothes/ collect/ the/ our/ to/ let's/ and
3. design/ to send/ friends/ someone/ greetings/ englishman/ a card/ christmas/ to/ an/ his/ had
4. held/ thanksgiving day/ contest/ ngo si lien school/ english-speaking/ on/ an/ was/ at
5. festival/ enjoyed/ very much/ mr. robinson/ the/ that/ he/ said
6. took/ contest/ people/ team/ part/ rice-cooking/ six/ each/ the/ from/ in
7. broken/ the cupboard/ bowls/ on/ been/ many/ have/ dishes/ and
8. english/ work/ were/ harder/ pronunciation/ we/ on/ advised/ to
9. keeping/ cool/ the system/ the air/ conditioning/ for/ air/ used/ is
10. exported/ many/ last years/ rice/ to/ how/ japan/ tons/ were/ of