Question

Select the correct answer from the choices A, B, C, and D which are given. Write only the letter corresponding to the correct answer.

Which of the following is a physical reaction?

• A. Frying egg
• B. A Macbook falling out of a window
• C. Digesting carrots
• D. Creating ATP in the human body

Answer 1

The correct option is B

A Macbook falling out of a window

The explanation for the correct option:

Option B

• A physical change is a change in which no new substance is formed.
• A physical change is temporary and reversible.
• In physical change the chemical composition of the original substance is not altered.
• For example, drying wet clothes, breaking a glass tumbler, drying paints, etc.
• When a MacBook fall from the window, no new substance is formed, so it is a physical reaction.

The explanation for the incorrect options:

Option A:

• Chemical reactions are the phenomena that involve reactions between one or more reactants that undergo chemicals associated with absorption or liberation of energy leading to the formation of one or more new substances.
• During frying of egg, the chemical composition of egg changes, therefore it is a chemical change.

Option C:

• Digestion is a chemical process.
• During digestion new substances are formed.

Option D"

• ATP production can occur in the presence of oxygen from cellular respiration, and protein catabolism, as well as under anaerobic conditions.
• New substances formed during this process.
• Hence, it is a chemical change.

Therefore, option B is correct.