Complete the sentence.
In this chemical reaction, zinc is a ().

 - reactant
 - product
Read the underlined text carefully. Look for information about what happens to zinc in this chemical reaction.
Many watches are powered by small, flat batteries called button cells. One common type of button cell contains the metal zinc. When zinc in the battery combines with oxygen in the air, zinc oxide forms. This process generates the electricity that powers the watch.
The underlined text tells you that when zinc and oxygen combine, zinc oxide is formed. When zinc and oxygen react, or go through a chemical change, their atoms are rearranged to form zinc oxide. Because zinc reacts in this chemical reaction, zinc is a reactant.