Quiz: Balancing Equations

1. When the number of atoms of each element are the same on both sides of the equation, the chemical reaction is said to be
a. in transition
b. balanced
c. at completion
2. When balancing a redox equation, the first step is to
a. determine the oxidation number of each element
b. determine the physical state of each element
c. determine the molar mass of each element

Use the following unbalanced chemical reaction to answer questions 3–5:

equation

3. Which species is the reducing agent?
a. CuSO4
b. HNO3
c. CuS
4. How many electrons are transferred?
a. 3
b. 8
c. 24
5. What is the coefficient placed in front of CuS to correctly balance this equation involving oxidation and reduction?
a. 3
b. 8
c. 24

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