Multiple Choice
What happens at the molecular level when sugar dissolves in water?
1. Intro to General Chemistry
Physical & Chemical Changes
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Which of the following represents a reversible change?
A
Melting a chocolate bar then re-solidifying it in the freezer.
B
Changing water vapor into oxygen and hydrogen gas.
C
Turning a potato into french fries.
D
Baking a cake from a recipe.
Verified step by step guidance1
Identify the concept of reversible and irreversible changes. A reversible change is a physical change that can be undone, while an irreversible change is a chemical change that cannot be easily reversed.
Examine the process of melting and re-solidifying a chocolate bar. Melting is a physical change where the chocolate changes from solid to liquid, and re-solidifying is the reverse process, making it reversible.
Consider the process of changing water vapor into oxygen and hydrogen gas. This involves a chemical reaction (electrolysis), which is not easily reversible, making it an irreversible change.
Analyze the process of turning a potato into french fries. This involves cutting and frying, which are physical and chemical changes, respectively, and cannot be easily reversed, making it irreversible.
Evaluate the process of baking a cake. This involves chemical reactions (baking) that change the ingredients into a new substance, which cannot be reversed, making it an irreversible change.
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