Question

part 3: sorting real - world changes
place each situation in the correct column.
situations to sort:

• ice melting in a cup
• crushing a can
• evaporation of rubbing alcohol
• photosynthesis in a plant
• food spoiling
• combustion of gasoline

physical changes
chemical changes

Explanation:

To determine if a change is physical or chemical, we check for new substances. Physical changes retain the substance's identity, while chemical changes form new substances.

• Physical Changes: Ice melting (solid to liquid water, same substance), crushing a can (shape change, same material), evaporation of rubbing alcohol (liquid to gas alcohol, same substance).
• Chemical Changes: Photosynthesis (CO₂ + H₂O → glucose + O₂, new substances), food spoiling (microbial action, new compounds), combustion of gasoline (fuel + O₂ → CO₂ + H₂O, new substances).

Answer:

Physical Changes:

• Ice melting in a cup
• Crushing a can
• Evaporation of rubbing alcohol

Chemical Changes:

• Photosynthesis in a plant
• Food spoiling
• Combustion of gasoline