Questions: Which of the following is a physical change? wood burning in a campfire iron turning to rust butter turning rancid distillation cooking an egg

Solution Steps

We need to determine which of the given processes is a physical change. A physical change involves a change in the state or appearance of a substance without altering its chemical composition.

1. Wood burning in a campfire: This is a chemical change because it involves combustion, producing new substances like carbon dioxide and water.
2. Iron turning to rust: This is a chemical change because iron reacts with oxygen to form iron oxide.
3. Butter turning rancid: This is a chemical change because it involves the breakdown of fats into new substances.
4. Distillation: This is a physical change because it involves separating components of a mixture based on differences in boiling points without changing their chemical composition.
5. Cooking an egg: This is a chemical change because it involves denaturing proteins and forming new substances.

Final Answer