Viết pthh thực hiện
H2o suy ra 02 suy ra fe04 suy ra fe +feso4
Kclo3 suy ra o2 suy ra so2 suy ra so3
K
Khách
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29 tháng 2 2020
a. Fe2O3 + 3CO --> 2Fe + 3CO2
b. 2Al +3H2SO4 --> Al2(SO4)3 + 3H2
c.2Al(OH)3 + 3H2SO4 --> Al2( SO4)3 + 6H2O
d. 2KOH + H2SO4 --> K2SO4 + 2H2O
e.Fe(OH)2 +2HCl--> FeCl2 + 2H2O
f. Fe2(SO4)3 + 3BaCl2 --> 2FeCl3 + 3BaSO4
g. 2Al + 3CuSO4 --> Al2(SO4)3 + 3Cu
h. 2Al + 3MgO --> Al2O3 + 3Mg
i. 2Al + 3Cl2 --> 2AlCl3
HA
14 tháng 5 2017
Change sentences into negative and interrogative form
a,He visited Hang Temple last month
\(\Rightarrow\) He didn't visit Hang Temple last month.
\(\Rightarrow\) Did he visit Hang Temple last month?
b,Ba sent letters to his parents
\(\Rightarrow\) Ba didn't send letters to his parents.
\(\Rightarrow\) Did Ba send letters to his parents?
c,Nam met Lan at the movie theater last night
\(\Rightarrow\) Nam didn't meet Lan at the movie theater last night.
\(\Rightarrow\) Did Nam meet Lan at the movie theater last night?
d,My father spent his summer vacation on the farm
\(\Rightarrow\) My father didn't spend his summer vacation on the farm.
\(\Rightarrow\) Did your father spend his summer vacation on the farm?
e,The people were friendy
\(\Rightarrow\) The people weren't friendly.
\(\Rightarrow\) Were the people friendly?
f,I was at home yesterday
\(\Rightarrow\) I wasn't at home yesterday.
\(\Rightarrow\) Were you at home yester day?
14 tháng 5 2017
a,He visited Hang Temple last month
(-) He didn't visit Hang Temple last month.
(?) Did he visit Hang Temple last month?
b,Ba sent letters to his parents
(-) Ba didn't send letters to his parents.
(?) Did Ba send letters to his parents?
c,Nam met Lan at the movie theater last night
(-) Nam didn't meet Lan at the movie theater last night.
(?) Did Nam meet Lan at the movie theater last night?
d,My father spent his summer vacation on the farm
(-) My father did not spend his summer vacation on the farm.
(?) Did you father spend his summer vacation on the farm?
e,The people were friendy
(-) The people were not friendly.
(?) Were the people friendly?
f,I was at home yesterday
(-) I wasn't at home yesterday.
(?) Were you at home yesterday?
DQ
4 tháng 12 2016
program CT_dautien;
uses crt;
var
begin
clrscr;
writeln('moi nhap diem'); readln(x);
if x>= 8.0 then write(x, ' la loai gioi');
if x>=6.5 then write(x, ' la loai kha');
if x>=5.0 then write(x, ' la loai trung binh');
if x>=3.4 then write(x, ' la loai yeu');
if x<3.4 then write(x, ' la loai kem');
readln
end.
MV
1
Cảm ơn nha