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