Question

battery should light a tiny light bulb.
what you need
to start, gather your supplies:

• a cardboard cereal box
• 7 nickels
• 7 pennies
• white vinegar
• salt
• plastic mixing bowls
• a glass measuring cup
• a 1 - teaspoon measuring spoon
• an led light bulb with long wires
• aluminum foil

what you do
first, cut the cardboard into 7 squares that are each as wide as a penny. next, mix 1/4 cup of vinegar and 3 teaspoons of salt in the bowl. put the cardboard squares in the bowl to get them wet. keep them in the bowl for a few minutes.
what is the first step in this experiment?
mixing vinegar and salt in a bowl
getting cardboard squares wet
counting pennies
cutting cardboard

Explanation:

In the "What You Do" section, the first step described is "First, cut the cardboard into 7 squares...", so the first step of the experiment is cutting cardboard. The other options (mixing vinegar and salt, getting cardboard squares wet, counting pennies) occur after or are not the first step as per the given procedure.

Answer:

cutting cardboard