Question

colleen was using steel to make each rusted sculptures. after building each sculpture, she caused it to rust by placing it in salt water for eight hours. colleen wondered if steel would rust faster if she added vinegar to the salt water. colleen cut ten squares of steel sheet metal. she put five of the squares into a tub filled with salt water. she put the other five squares into a tub filled with salt water mixed with vinegar. once an hour for eight hours, colleen counted how many steel squares in each group had rust on them. in this experiment, which were part of an experimental group? the steel squares soaked in salt water the steel squares soaked in salt water and vinegar

Explanation:

Step1: Identify experimental groups

There are two - steel squares in salt water and steel squares in salt water and vinegar.

Answer:

The steel squares soaked in salt water, the steel squares soaked in salt water and vinegar