Question

1. which of the following is examples of a chemical change? options: water evaporating from a cup, rust forming on a car door, dissolving sugar into water, cutting a piece of paper

Explanation:

To determine a chemical change, we check for new substance formation.

• Water evaporating: Physical (state change, no new substance).
• Dissolving sugar: Physical (sugar dissolves, no new substance).
• Cutting paper: Physical (shape change, no new substance).
• Rust forming: Chemical (iron reacts with oxygen to form rust, new substance).

Answer:

Rust forming on a car door