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