Describe how you can use a negatively charged comb to determine the charge of pieces of confetti.

This is because the neutrality of polarity can be changed by electric field in this case. When you create - charge in the comb and you expose the pieces of confetti to the electric field created by the charge, you will polarise them so that the part closer to the comb will be + and the other will be

materials water oxygen those are the things i can think of in this moment.

i am going to guess that it is co2.