Question

determine which type of change each statement represents. physical change chemical change sliver spoon tarnishes crushing an aluminum can copper turns a greenish color burning wood freezing water aluminum combining with oxygen to form aluminum oxide recycling used aluminum cans to make new ones grind coffee beans

Explanation:

A physical change alters the form or appearance of a substance without changing its chemical composition. A chemical change results in the formation of a new substance with different chemical properties. Tarnishing of silver is a chemical reaction with sulfur - containing compounds in air. Crushing an aluminum can only changes its shape. Copper turning green is due to a chemical reaction with air components. Burning wood is a combustion reaction, a chemical change. Freezing water is a phase change, a physical change. Aluminum combining with oxygen is a chemical reaction. Recycling aluminum cans involves melting and reshaping, a physical change. Grinding coffee beans only changes their size and shape, a physical change.

Answer:

• silver spoon tarnishes: chemical change
• crushing an aluminum can: physical change
• copper turns a greenish color: chemical change
• burning wood: chemical change
• freezing water: physical change
• aluminum combining with oxygen to form aluminum oxide: chemical change
• recycling used aluminum cans to make new ones: physical change
• grind coffee beans: physical change