Question

a man makes breakfast. he puts some toast in the toaster, and mixes some eggs with a little milk in a bowl. as he begins cooking the eggs, he smells the toast burning. he takes the toast out of the toaster and puts some butter on it, which melts. finally, he pours some orange juice through a strainer to remove the pulp. he eats the meal, and he digests it as he drives to work in his car. (1 point) which option correctly identifies a chemical and a physical change in the scenario?

• burning toast is a physical change; straining orange juice is a chemical change.
• burning toast is a chemical change; straining orange juice is a physical change.
• digesting food is a chemical change; the car burning gas is a physical change.
• digesting food is a physical change; the car burning gas is a chemical change.

Explanation:

To solve this, we analyze each change:

• Burning toast: Combustion (burning) involves a chemical reaction (new substances like CO₂, ash form) → chemical change.
• Straining orange juice: Separating pulp from juice (no new substance, just physical separation) → physical change.
• Digesting food: Enzymes break food into new substances (e.g., glucose) → chemical change.
• Car burning gas: Combustion of fuel (gas → CO₂, H₂O, energy) → chemical change.

Now evaluate options:

• Option 1: Burning toast is physical (wrong, it’s chemical); straining OJ is chemical (wrong, it’s physical) → Eliminate.
• Option 2: Burning toast is chemical (correct); straining OJ is physical (correct) → This matches.
• Option 3: Digesting food is chemical (correct), but car burning gas is physical (wrong, it’s chemical) → Eliminate.
• Option 4: Digesting food is physical (wrong, it’s chemical); car burning gas is chemical (correct) → Eliminate.

Answer:

B. Burning toast is a chemical change; straining orange juice is a physical change