Praxis 5005 Practice Question
A reaction occurs between two liquid substances in a sealed container. Based on the law of conservation of mass, what will happen to the mass of the sealed container and its contents overall?
Correct Answer: D
Rationale: The law of conservation of mass states that mass cannot be created or destroyed in a closed system. Therefore, regardless of the products formed—gas, solid, or liquid—the total mass within the sealed container will remain constant.
Option A is incorrect because even if a gas is produced, it remains within the container, so the overall mass does not decrease. Option B is misleading; while a solid may form, it does not lead to an increase in mass since the total mass of reactants equals that of the products. Option C is also incorrect, as producing a liquid does not change the total mass. Thus, the mass remains unchanged throughout the reaction.
Unlock All Questions
Subscribe to Premium for full access to all practice questions, detailed rationales, and performance tracking.
Subscribe Now