Which of the following is an example of a chemical change?

• A. Breaking a glass
• B. Dissolving sugar in water
• C. Burning of magnesium ribbon
• D. Melting of ice

Answer: (C)

Verified step by step guidance

1. Understand the difference between physical and chemical changes. A physical change affects the form of a substance but not its chemical composition, while a chemical change results in the formation of one or more new substances with different properties.
2. Analyze each option: Breaking a glass is a physical change because the glass is only physically broken into pieces, but its chemical composition remains the same.
3. Dissolving sugar in water is generally a physical change because the sugar molecules disperse in water but do not chemically react or change their structure.
4. Burning of magnesium ribbon is a chemical change because magnesium reacts with oxygen in the air to form magnesium oxide, a new substance with different chemical properties.
5. Melting of ice is a physical change because ice changes from solid to liquid water without altering its chemical composition (H2O remains H2O).