BIO 105/106 Lesson 1 Chemistry Part 10

Biology 105/106

Lesson 1: Chemistry of Life Part 09



When it comes to balancing chemical equations, the more practice, the better you will be at it.
Here is a few practice problems:



Balance each equation. The coefficients for each equation are read from left to right

A. Mg + N2 -----> Mg3N2

1) 1, 3, 2
2) 3, 1, 2
 3) 3, 1, 1

B. Al + Cl2  ----> AlCl3

1) 3, 3, 2
 2) 1, 3, 1
 3) 2, 3, 2

C. Fe2O3 + C  ----->   Fe + CO2

1) 2, 3, 2,3
 2) 2, 3, 4, 3
 3) 1, 1, 2, 3

D. Al + FeO -----> Fe + Al2O3

1) 2, 3, 3, 1
 2) 2, 1, 1, 1
 3) 3, 3, 3, 1

E. Al + H2SO4  ----->  Al2(SO4)3 + H2

1) 3, 2, 1, 2
 2) 2, 3, 1, 3
 3) 2, 3, 2, 3


Solutions:
A. 3 Mg + N2 -----> Mg3N2
B. 2 Al + 3 Cl2 ------>   2 AlCl3
C. 2 Fe2O3 + 3 C ------->  4 Fe + 3 CO2
D. 2 Al + 3 FeO -------> 3 Fe + Al2O3
E. 2 Al + 3 H2SO4 ----------> Al2(SO4)3 + 3 H2