lm hộ ạ
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lm hộ mk vs tiện thể giải thik hộ ạ
KH
3
H
13 tháng 7 2021
Bài 6 :
$a) H_2SO_4 + BaCl_2 \to BaSO_4 + 2HCl$
$b) CaCO_3 + 2HNO_3 \to Ca(NO_3)_2 + CO_2 + H_2O$
$c) 2KOH + 2NaHSO_4 \to Na_2SO_4 + K_2SO_4 + 2H_2O$
$d) CuO + 2HCl \to CuCl_2 + H_2O$
$e) SO_2 + NaOH \to NaHSO_3$
$g) CO_2 + 2NaOH \to Na_2CO_3 + H_2O$
Câu 7 :
CTHH lần lượt là : $HBr,H_2SiO_3,HMnO_4,H_2Cr_2O_7$
1 How many teacher are there in your school?
2 Mary and Jane are students at this school
3 His school is small but it is in a big city
4 How many classrooms are there in Phong's school?
5 My school has 4 floors and my classroom is on the second floor
1. How many teachers are there in your school ?
2. Mary and jane are students in their school.
4. His school is small but it's in a big city.
5. How many classrooms are there in Phong's school ?
6. My school has four floors and my classroom is on the second floor.