Which of the following was NOT one of the observations from the labs that indicated a chemical reaction was occurring?
a. bubbles
b. gas forming
c. color change
d. all of the above was observed signs of a chemical reaction
d. all of the above was observed signs of a chemical reaction
The correct answer is d. all of the above was observed signs of a chemical reaction.
Explanation: If all of the above observations (bubbles, gas forming, color change) were observed, then it indicates that a chemical reaction was indeed occurring.
To determine which of the options was NOT one of the observed signs of a chemical reaction, we need to carefully evaluate each option. The correct answer will be the one that does not fit the criteria of a chemical reaction.
a. Bubbles: The formation of bubbles is often a visible indication that a gas is being produced during a chemical reaction. This can occur when a gas is released as a product or when a solid reacts with a liquid, resulting in gas formation. Therefore, the presence of bubbles can be an indication of a chemical reaction.
b. Gas forming: Similar to the explanation above, the formation of gas is a typical sign of a chemical reaction. When reactants combine or decompose, they may release gas as a byproduct.
c. Color change: A color change is another common indication that a chemical reaction has occurred. It can result from the formation of new substances with different properties, such as when reactants combine and undergo a chemical transformation.
Based on this evaluation, it can be concluded that all of the options provided (a, b, and c) are valid observations that indicate a chemical reaction is occurring. Therefore, the correct answer is (d) "all of the above."