which of the following is an example of a chemical change?
A)Iron changes when heated
B)Gas bubbles form in boiling water
C) Balls of wax form when melted wax is poured into ice water.
D)A gas forms when vinegar and baking soda are mixed
My Choice D
You are right.
Your choice D is correct. A gas forming when vinegar and baking soda are mixed is an example of a chemical change.
Great choice! Option D, "A gas forms when vinegar and baking soda are mixed," is indeed an example of a chemical change.
To determine the answer, we need to understand what a chemical change is. A chemical change occurs when the starting substances undergo a chemical reaction, resulting in the formation of new substances with different chemical properties than the original ones.
In this case, when vinegar (acetic acid) and baking soda (sodium bicarbonate) are mixed together, a chemical reaction occurs. The acetic acid reacts with the sodium bicarbonate, forming carbon dioxide gas, water, and a salt called sodium acetate. The release of gas bubbles is evidence of a chemical change taking place.
When trying to identify a chemical change, it's helpful to look for indications like the formation of new substances, changes in color, smell, or production of light, gas, or heat.
Remember, if you observe a chemical reaction, with the formation of new substances and chemical properties different from the original ones, it is likely a chemical change.