A voltaic cell was constructed using a zinc electrode (submerged in zinc sulfate), a copper electrode (submerged in copper(II) sulfate), and a salt bridge containing sodium sulfate. Given that zinc more easily forms cations than copper, which of the following statements is true concerning this voltaic cell? a. Electrons flow from the zinc anode to the copper cathode.
b. The mass of the anode increases over time.
c. Sulfate ions from the salt bridge will migrate to the zinc sulfate solution.
d. Sodium ions from the salt bridge will migrate to the copper sulfate solution.

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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b. examine and describe cells