Use the table of observed changes to answer the question.%0D%0A%0D%0AChange #%09Reacts with another substance?%09Temperature change?%09Gas, sound, or light produced?%09New substance formed?%0D%0A1%09yes%09yes%09yes%09yes%0D%0A2%09no%09yes%09yes%09no%0D%0A3%09yes%09yes%09yes%09yes%0D%0A4%09no%09no%09no%09no%0D%0AWhich changes shown in the table are physical changes?%0D%0A%0D%0A(1 point)%0D%0AResponses%0D%0A%0D%0A1 and 4%0D%0A1 and 4%0D%0A%0D%0A2 and 4%0D%0A2 and 4%0D%0A%0D%0A1 and 2%0D%0A1 and 2%0D%0A%0D%0A2 and 3

Answer 1

To determine which changes are physical changes, we need to understand the characteristics of physical and chemical changes.

• Physical changes do not produce new substances. They can involve changes in temperature, state, or appearance but do not lead to a change in the chemical composition of the material.
• Chemical changes are characterized by the formation of new substances.

From the provided information in the table:

• Change 1: Reacts with another substance? Yes, Temperature change? Yes, Gas, sound, or light produced? Yes, New substance formed? Yes. (Chemical change)
• Change 2: Reacts with another substance? No, Temperature change? Yes, Gas, sound, or light produced? Yes, New substance formed? No. (Physical change)
• Change 3: Reacts with another substance? Yes, Temperature change? Yes, Gas, sound, or light produced? Yes, New substance formed? Yes. (Chemical change)
• Change 4: Reacts with another substance? No, Temperature change? No, Gas, sound, or light produced? No, New substance formed? No. (Physical change)

Based on this analysis, the changes that are classified as physical changes are Change 2 and Change 4.

Therefore, the correct response is 2 and 4.