Which of the following most likely happens during a physical change?
An irreversible process takes place.
Substance changes its form but not its molecular composition.
New atoms are introduced in the molecules of the substance.
A substance reacts differently with a chemical before and after the change
Substance changes its form but not its molecular composition.
During a physical change, the most likely event that occurs is that the substance changes its form but not its molecular composition.
To determine which of the following most likely happens during a physical change, let's break down each option:
1. An irreversible process takes place:
- Physical changes are generally reversible processes, meaning the original substance can be reclaimed after the change. Therefore, this option is not likely during a physical change.
2. Substance changes its form but not its molecular composition:
- This is a characteristic of physical changes. During a physical change, the substance undergoes a transformation in its physical form (such as changing states of matter) without any alteration in its molecular composition. Therefore, this option is likely during a physical change.
3. New atoms are introduced in the molecules of the substance:
- Physical changes do not involve the introduction of new atoms into the molecules of a substance. The composition of the substance remains the same, only its physical properties change. Therefore, this option is not likely during a physical change.
4. A substance reacts differently with a chemical before and after the change:
- Physical changes do not involve chemical reactions. The substance retains the same chemical composition and only undergoes a change in its physical properties. Therefore, this option is not likely during a physical change.
Based on the explanations provided, the most likely option that happens during a physical change is:
- Substance changes its form but not its molecular composition.