Which of the following requires a chemical change?A.Blending mustard and ketchup on a bunB.Letting the fizz escape from a sodaC.Toasting a marshmallow over a fireD.Melting chocolate on a graham cracker
Question
Which of the following requires a chemical change?A.Blending mustard and ketchup on a bunB.Letting the fizz escape from a sodaC.Toasting a marshmallow over a fireD.Melting chocolate on a graham cracker
Solution
The option that requires a chemical change is C. Toasting a marshmallow over a fire.
Here's why:
A. Blending mustard and ketchup on a bun is a physical change. The substances are mixed together but they do not form a new substance.
B. Letting the fizz escape from a soda is also a physical change. The carbon dioxide gas is released from the soda, but it does not form a new substance.
C. Toasting a marshmallow over a fire is a chemical change. The heat from the fire causes the sugars in the marshmallow to caramelize, which is a chemical reaction. This results in a new substance with a different color and flavor.
D. Melting chocolate on a graham cracker is a physical change. The chocolate changes from a solid to a liquid, but it does not form a new substance.
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