Which of the following observations NOT likely describes a chemical change? a A white solid was exposed to ultraviolet light and
turned brown. b Two clear liquids were mixed together and a yellow solid formed c A solid was added to water and the mixture was stirred until the solid was no longer visible d A piece of metal was added to a liquid and bubbles formed on the surface of the metal
The correct answer would be - c. A solid was added to water and the mixture was stirred until the solid was no longer visible
Explanation:
Photostabalizing is the process where a solid change its color in the presence of ultraviolet light, it is a chemical change, so the first option would not be the correct answer.
when two liquid or aqueous solutions are mixed together and form a solid substance, this reaction is known as precipitation and it is a chemical reaction too.
When a solid is placed in a liquid and after stirring it makes the solid vanish is a physical change known as dissolving character.
It indicates phase changes:<em> melting then later boiling.</em>
Explanation:
On the heating curve of water, the plateau marks phase change transitions.The temperature remains constant during this period.The first phase change is melting of water.The second phase change is boiling of water to gas.
Fire represents that if any acid or chemical reaction occurs, there may be chances of fire/explosion occurring. Wind, sunlight and dust doesn't matter when it comes to experimenting with chemicals.
