2.Chemical Reaction Equation
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Transcript 2.Chemical Reaction Equation
B. Chemical Reaction
Equation
B. Persamaan Reaksi Kimia
Teaching Learning Objectivers
• The student can explain signification
chemical reaction equation.
• The student can getting over with
balance simple the chemical reaction
equation.
• The student can getting over wih the
balance the chemical reaction equation
with matematical equation method.
A substance is called having chemical
changes when it transforms into novel
substance with defferent properties form
its nature. This change is also called as
chemical reaction.
The chemical reaction happened is indicated
with flocculation, gas forming, color change, or
heat transfer.
The chemical reaction equation
menggambarkan reaksi yang terdiri
atas rumus kimia zat yang bereaksi
dan zat hasil reaksi disertai koefisien
masing-masing zat yang dibatasi tanda
panah
Zat yang bereaksi (reaktan) ditulis disebelah
kiri anak panah sedangkan zat hasil (produk)
ditulis disebelah kanan anak panah.
Koefisien reaksi adalah angka yang
ditempatkan di depan rumus molekul
senyawa .
Persamaan reaksi kimia yang lengkap
terdapat koefisien reaksi dan wujud zat.
Example
Mg(s) + O2(g)
1 atom Mg 2 atom O
Mg
+
O2
1 atom Mg 2 atom O
2 Mg
+
2 atom Mg
O2
2 atom O
MgO(s)
1 atom Mg + 1 atom O
2 MgO
2 atom Mg + 2 atom O
2MgO
2 atom Mg + 2 atom O
Na(s) +
O2(g)
1 atom Na 2 atom O
Na
+
O2
1 atom Na 2 atom O
4Na
+
O2
Na2O(s)
2 atom Na + 1 atom O
2Na2O
4 atom Na + 2 atom O
2Na2O
4 atom Na 2 atom O 4 atom Na + 2 atom O
Balancing the chemical equation with
mathematical equation method
Example
KMnO4(aq) + HCl(aq)
KCl(aq) + MnCl2(aq) + H2O(l) + Cl2(g)
Every reaction coeffisient of substances should be alphabetically
aKMnO4(aq) + bHCl(aq)
cKCl(aq) + dMnCl2(aq) + eH2O(l)
+f Cl2(g)
Then, change into mathematical equation form.
aKMnO4(aq) + bHCl(aq)
cKCl(aq) + dMnCl2(aq) +
eH2O(l) + fCl2
To equalize K atom
:
a = c (1)
To equalize Mn atom :
a = d (2)
To equalize O atom : 4a = e (3)
To equalize H atom :
To equalize Cl atom :
b = 2e (4)
b = c + 2d + 2f (5)
For instance : a=1 (1) a=c
(3)4a=e
4x1=e
e=4
(4) b=2e
c=1
(2) a=d
(5) b= c + 2d + 2f
d=1
8 – 3 = 2f
b=2 x 4
8 = 1 + 2x1+ 2f
2f = 5
b= 8
8=1+2
f = 5/2
+ 2f
aKMnO4(aq)+bHCl(aq)
1
8
cKCl(aq)+dMnCl2(aq)+eH2O(l)+fCl2
1
1
4
5/2
X2
2KMnO4(aq)+16HCl(aq)
2KCl(aq)+2MnCl2(aq)+8H2O(l)+5Cl2
Tentukan koefisien persamaan reaksi di
bawah ini.
1.
2.
3.
4.
5.
6.
7.
N2 + H2
NH3
S + O2
SO3
SO2 + O2
SO3
H3PO4 + Ca(OH)2
Ca3(PO4)2 + H2O
Al + H2SO4
Al2(SO4)3 + H2
P2O5 + Al(OH)3
AlPO4 + H2O
NaOH + Cl2
NaCl + NaOCl2 + H2O