the chains on a swing rust. the temperature of water lowers when it is put in the refrigerator. the…

the chains on a swing rust. the temperature of water lowers when it is put in the refrigerator. the temperature of two chemicals lowers when they are mixed together. bubbles rise in a glass of soda. steel wool is sprayed with vinegar, and it starts to smell like eggs. raw eggs are placed in boiling water, and after 15 minutes they look, smell, and taste different on the inside. evidence of a chemical reaction not evidence of a chemical reaction

the chains on a swing rust. the temperature of water lowers when it is put in the refrigerator. the temperature of two chemicals lowers when they are mixed together. bubbles rise in a glass of soda. steel wool is sprayed with vinegar, and it starts to smell like eggs. raw eggs are placed in boiling water, and after 15 minutes they look, smell, and taste different on the inside. evidence of a chemical reaction not evidence of a chemical reaction

Answer

Explanation:

Step1: Recall chemical - reaction signs

Chemical reactions often show signs like color change, gas production, odor change, and formation of new substances.

Step2: Analyze "The chains on a swing rust"

Rusting is a chemical reaction where iron reacts with oxygen and water to form iron oxide. So it's evidence of a chemical reaction.

Step3: Analyze "Bubbles rise in a glass of soda"

The bubbles are carbon - dioxide gas being released as the carbonic acid in soda decomposes. It's evidence of a chemical reaction.

Step4: Analyze "The temperature of water lowers when it is put in the refrigerator"

This is a physical change of cooling, no new substance is formed. It's not evidence of a chemical reaction.

Step5: Analyze "Steel wool is sprayed with vinegar, and it starts to smell like eggs"

The smell like eggs is likely due to the production of hydrogen sulfide gas in a chemical reaction. It's evidence of a chemical reaction.

Step6: Analyze "The temperature of two chemicals lowers when they are mixed together"

This could be an endothermic physical or chemical process. Without more information, we can't be sure, but if it's due to a chemical reaction, it's evidence. Let's assume it's a chemical reaction for this case.

Step7: Analyze "Raw eggs are placed in boiling water, and after 15 minutes they look, smell, and taste different on the inside"

The proteins in the egg are denatured, a chemical change occurs. It's evidence of a chemical reaction.

Answer:

Evidence of a chemical reaction: The chains on a swing rust, Bubbles rise in a glass of soda, Steel wool is sprayed with vinegar and it starts to smell like eggs, The temperature of two chemicals lowers when they are mixed together, Raw eggs are placed in boiling water and after 15 minutes they look, smell, and taste different on the inside. Not evidence of a chemical reaction: The temperature of water lowers when it is put in the refrigerator.