The MOST OBVIOUS indicator that a chemical reaction occurred is:
• A gas was formed.
The bubbling and formation of gas indicate that a reaction took place, making it the clearest sign of a chemical change.
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)
• There was a change in temperature.
• The powder changed color.
• A gas was formed.
• The powder mixed with the water.
1 answer