Which of the following observations would indicate that Pedro succeeded in creating a chemical change?

• A. The substance was broken into smaller pieces but remained the same chemically.
• B. A new substance with different properties was formed.
• C. The substance changed from solid to liquid without altering its composition.
• D. The temperature of the substance increased, but no new substance appeared.

Answer: (B)

Verified step by step guidance

1. Understand the difference between a physical change and a chemical change. A physical change affects the form or appearance of a substance but does not change its chemical composition.
2. Recognize that a chemical change results in the formation of one or more new substances with different chemical properties and compositions than the original substance.
3. Analyze each observation: breaking a substance into smaller pieces is a physical change because the chemical identity remains the same.
4. Changing from solid to liquid without altering composition is a physical change (a phase change), not a chemical change.
5. An increase in temperature without the formation of a new substance indicates a physical change, not a chemical change. Therefore, the observation that a new substance with different properties was formed indicates a chemical change.