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
The option that was NOT one of the observations indicating a chemical reaction was occurring is option c: color change.
To determine which of the options was NOT an observation indicating a chemical reaction, we need to understand each option and how it relates to chemical reactions.
a) Bubbles: The formation of bubbles is often a clear indication that a gas is being produced during a chemical reaction. This can happen when a gas is released as a product or when a gas is formed as a result of a reaction between two substances. Therefore, bubbles can be an observation indicating a chemical reaction.
b) Gas forming: This option seems similar to the previous one, which refers to the formation of bubbles. Both options imply the production of gas during a chemical reaction. Therefore, "gas forming" can also be an observation indicating a chemical reaction.
c) Color change: In some cases, a chemical reaction can cause a noticeable change in color. This generally indicates that a new substance has been formed as a result of the reaction. Therefore, a color change can be an observation indicating a chemical reaction.
d) All of the above signs were observed: This option states that all of the previous observations (a, b, and c) were observed signs of a chemical reaction. However, the question asks for the option that was NOT an observation indicating a chemical reaction. Since all the options (a, b, c) are observations indicating a chemical reaction, option d is not the correct answer.
Therefore, the correct answer is option d: "All of the above was observed signs of a chemical reaction."