Download Balancing Chemical Equations Answers

Name ________________
Balancing Chemical Equations
Date:_________________
1. A balanced equation representing a chemical reaction can be written using
1) chemical formulas and mass numbers
2) chemical formulas and coefficients
3) first ionization energies and mass numbers
4) first ionization energies and coefficients
2. Which equation is correctly balanced?
1)
2)
3)
4)
CaO + 2H2O ® Ca(OH) 2
NH 3 + 2O2 ® HNO 3 + H2O
Ca(OH) 2 + 2H3PO 4 ® Ca3(PO4) 2 + 3H2O
Cu + H 2SO 4 ® CuSO 4 + H2O + SO 2
3. Which chemical equation is correctly balanced?
1) H2(g) + O 2(g) ® H2O(g)
2) N2(g) + H 2(g) ® NH 3(g)
3) 2NaCl(s) ® Na(s) + Cl2(g)
4) 2KCl(s) ® 2K(s) + Cl 2(g)
4. Given the unbalanced equation:
__Na + __H2O ® __H2 + __NaOH
When the equation is correctly balanced using the smallest whole-number coefficients, the coefficient for H2
O is
1) 1
2) 2
3) 3
4) 4
5. Given the unbalanced equation:
__Fe 2O3 + __CO
__Fe + __CO 2
When the equation is correctly balanced using the smallest whole-number coefficients, what is the
coefficient of CO?
1) 1
2) 2
3) 3
4) 4
6. Given the unbalanced equation:
__Mg(ClO3)2(s) ® __MgCl2(s) + __O2(g)
What is the coefficient of O2 when the equation is balanced correctly using the smallest whole number
coefficients?
1) 1
2) 2
3) 3
4) 4
7. Given the unbalanced equation:
__ Al(s) + __O2(g) ® __Al2O3(s)
When this equation is correctly balanced using smallest whole numbers, what is the coefficient of O2(g)?
1) 6
2) 2
3) 3
4) 4
Chemistry!
Balancing Chemical Equations
8. Given the unbalanced equation:
___N2(g) + ___ O2(g)
___ N2O5(g)
When the equation is balanced using smallest whole numbers, the coefficient of N2(g) will be
1) 1
2) 2
3) 5
4) 4
9. Given the unbalanced equation:
NaOH + H3PO4 ® Na3PO4 + H2O
When the equation is correctly balanced, the coefficient of H2O will be
1) 1
2) 2
3) 3
4) 4
10. When the equation
__ C2H4 + __ O2 ® __ CO2 + __ H2O
is balanced using smallest whole numbers, what is the coefficient of the O2?
1) 1
2) 2
3) 3
4) 4
11. Given the unbalanced equation:
__Al2(SO4)3 + __Ca(OH)2 ®
__Al(OH)3 + __CaSO4
When the equation is completely balanced using the smallest whole number coefficients the sum of the
coefficients is
1) 5
2) 9
3) 3
4) 4
Chemistry!
Answer Key
Balancing Equations
1.
2
2.
2
3.
4
4.
2
5.
3
6.
3
7.
3
8.
2
9.
3
10.
3
11.
2
Chemistry!