Betty placed an unknown powder in a zip lock bag. When she added water to the bag, the powder bubbled, and it disappeared. When the bubbling stopped, the bag contained a clear liquid and a lot of gas. What is the MOST OBVIOUS indicator a chemical reaction occurred? (1 point) Responses

The powder mixed with the water. The powder mixed with the water.
A gas was formed. A gas was formed.
There was a change in temperature. There was a change in temperature.
The powder changed color.