Question

question 6 (3 points)
match each example with its correct type of change: physical change or chemical change.
dissolving salt in vinegar
cooking an egg
fermentation of grape juice 1. physical change
freezing of water 2. chemical change
shattering a glass bottle
combustion of wood

Explanation:

• Dissolving salt in vinegar: Salt dissociates in vinegar without forming new substances chemically, but it's a chemical - like process in a solution context. However, it's mainly a physical - like change of state in solution, so it's a physical change.
• Cooking an egg: The proteins in the egg denature due to heat, forming new chemical structures, so it's a chemical change.
• Fermentation of grape juice: Yeast converts sugars into alcohol and carbon dioxide, creating new substances, so it's a chemical change.
• Freezing of water: Water changes from liquid to solid without changing its chemical composition, so it's a physical change.
• Shattering a glass bottle: The glass breaks into pieces but its chemical nature remains the same, so it's a physical change.
• Combustion of wood: Wood reacts with oxygen to produce carbon dioxide, water, and ash, forming new substances, so it's a chemical change.

Answer:

• Dissolving salt in vinegar: 1. Physical Change
• Cooking an egg: 2. Chemical Change
• Fermentation of grape juice: 2. Chemical Change
• Freezing of water: 1. Physical Change
• Shattering a glass bottle: 1. Physical Change
• Combustion of wood: 2. Chemical Change