Download Balancing Chemical Equations Quiz Answer Key

Balancing Chemical Equations Quiz Answer Key
1. A chemical _____ represents the changes that occur in a chemical reaction.
equation
2. Which of the following is the general form of a chemical equation?
a) Reactants = Products
b) Products + Reactants = 100%
c) Products → Reactants
d) Reactants → Products
d
3. A chemical equation is balanced when the number of each type of _____ is the same on
both sides of the equation.
atom
4. Which of the following equations is balanced?
a) H2 + O2 → H2O
b) 2H2 + O2 → 2H2O
c) H2 + 2O2 → 2H2O
d) 2H2 + O2 → H2O
b
5. True or false: Numbers called subscripts are used to balance chemical equations.
false
6. What is the first step in balancing a chemical equation?
1
The first step in balancing a chemical equation is to count each type of atom in reactants
and products.
7. Which of the following rules should you follow to balance chemical equations?
a) Change only the subscripts.
b) Use the smallest possible subscripts.
c) Add coefficients as needed.
d) two of the above
c
8. What does the coefficient in front of a chemical symbol show in a chemical equation?
The coefficient in front of a chemical symbol shows how many of that type of atom or
molecule are involved in the chemical reaction.
9. Which coefficient will balance the following equation?
Zn + HCl → ZnCl2 + H2
a) 2
b) 3
c) 4
d) none of the above
a
10. Balance this chemical equation: N2 + H2 → NH3.
The balanced equation is N2 + 3H2 → 2NH3.
2