Giúp mk vs ạk '-'💦
Giúp mk vs ạ mk cảm ưn💦
1 F
2 F
3 T
4 F
5 F
6 F
7 T
8 T
9 F
10 T
Giúp mk vs ạk
\(4Al + 3O_2 \xrightarrow{t^o} 2Al_2O_3\\ 2Al + 3Cl_2 \xrightarrow{t^o} 2AlCl_3\\ Al_2O_3 + 6HCl \to 2AlCl_3 + 3H_2O\\ Al_2O_3 + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2O\\ AlCl_3 + 3AgNO_3 \to 3AgCl + Al(NO_3)_3\\ Al_2(SO_4)_3 + 3Ba(NO_3)_2 \to Al(NO_3)_2 + 3BaSO_4\\ Al_2(SO_4)_3 + 6KOH \to 2Al(OH)_3 + 3K_2SO_4\\ Al(NO_3)_3 + 3KOH \to Al(OH)_3 + 3KNO_3\\ Al(OH)_3 + NaOH \to NaAlO_2 + 2H_2O\\ 2Al(OH)_3 \xrightarrow{t^o} Al_2O_3 + 3H_2O\)
4Al + 3O2 -> 2Al2O3
Al2O3 + 6HCl -> 2AlCl3 + 3H2O
2Al + 6HCl -> 2AlCl3 + 3H2
Al2O3 + 3H2SO4 -> Al2(SO4)3 + 3H2O
AlCl3 + 3AgNO3 -> Al(NO3)3 + 3AgCl
Al2(SO4)3 + 3Ba(NO3)2 -> 2Al(NO3)3 + 3BaSO4
Al(NO3)3 + 3NaOHvừa đủ -> Al(OH)3 + 3NaNO3
Al2(SO4)3 + 3Ba(OH)2vừa đủ -> 2Al(OH)3 + 3BaSO4
Al(OH)3 + NaOH -> NaAlO2 + 2H2O
2Al(OH)3 -> Al2O3 + 3H2O
Al2O3 + 2NaOH -> 2NaAlO2 + H2O
\(4Al+3O_2\underrightarrow{^{t^0}}2Al_2O_3\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)
\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(AlCl_3+3AgNO_3\rightarrow Al\left(NO_3\right)_3+3AgCl\)
\(Al_2\left(SO_4\right)_3+3Ba\left(NO_3\right)_2\rightarrow2Al\left(NO_3\right)_3+3BaSO_4\)
\(Al_2\left(SO_4\right)_3+6NaOH\rightarrow2Al\left(OH\right)_3+2Na_2SO_4\)
\(Al\left(NO_3\right)_3+3NaOH\rightarrow Al\left(OH\right)_3+3NaNO_3\)
\(NaOH+Al\left(OH\right)_3\rightarrow NaAlO_2+2H_2O\)
\(2Al\left(OH\right)_3\underrightarrow{^{t^0}}Al_2O_3+3H_2O\)
\(2NaOH+Al_2O_3\rightarrow2NaAlO_2+H_2O\)
Giup mk vs ak mk cam on 💦
29-[16+3.(51-40)]
.giúp mk tính từg bước vs ạk
29 - [16+3.(51-40)= 29 - [16+3.11]
= 29 - [16+ 33] ( vi nhan chia truoc cong tru sau )
= 29 - 49
= - 20
chuc ban hoc tot
-5+(-37-45+51)-(-37+51)
.giúp mk tính từg bước vs ạk
= -5 - 37 - 45 + 51 + 37 - 51
= (-5 -45 )+ (37 - 37) + (51 - 51)
= -50
\(-5+\left(-37-45+51\right)-\left(-37+51\right)\)
\(=-5-37-45+51+37-51\)
\(=-\left(5+45\right)-\left(37-37\right)+\left(51-51\right)\)
\(=-50-0+0=-50\)
- 5 + ( - 37 - 47 + 51 ) - ( - 37 + 51 ) = - 5 + ( - 33 ) - 14
= - 38 - 14
= - 52
Chúc bạn học tốt
-15+17-22+15-17+22
.giúp mk tính từg bước vs ạk.
=-15+15+17-17-22+22
=0+17-17-22+22
=0+0-22+22
=0+0+0
=0
- 145.(13-57)+57.(10-145)
.giúp mk tính từg bước vs ạk
C1: -145.(13-57)+57.(10-145)
=-145.(-44)+57.-135
=6380+(-7695)
=-1315
C2:SGK
-1315 tính trong ngoặc trước rồi nhân xong rồi công lại
54-(45-30+54)-30+5
.giúp mk tính từg bước vs ạk
54 - ( 45 - 30 + 54 ) - 30 + 5
= 54 - 45 + 30 - 54 - 30 + 5
= ( 54 - 54 ) - ( 45 - 5 ) + ( 30 - 30 )
= 0 - 40 + 0
= - 40
= 54-45+30-54-30+5
= (54-54) + (30-30) - (45-5)
= -40
\(\text{54-(45-30+54)-30+5}\)
\(=54-45+30-54-30+5\)
\(=9+30-54-30+5\)
\(=39-54-30+5\)
\(=-15-30+5\)
\(=-45+5\)
\(=-40\)