Multiple Choice
Which statement best describes the variables in a controlled experiment?
2. Atoms & Elements
Law of Conservation of Mass
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Which of the following processes returns carbon to the atmosphere, demonstrating the Law of Conservation of Mass?
A
Sedimentation
B
Photosynthesis
C
Absorption by plants
D
Respiration
Verified step by step guidance1
Understand the Law of Conservation of Mass, which states that mass is neither created nor destroyed in a chemical reaction. This means that the total mass of reactants equals the total mass of products.
Identify the process of respiration. Respiration is a metabolic process where organisms convert glucose and oxygen into carbon dioxide, water, and energy. This process releases carbon dioxide back into the atmosphere.
Recognize that during respiration, carbon atoms from glucose are converted into carbon dioxide, which is released into the atmosphere. This demonstrates the Law of Conservation of Mass as the carbon is not lost but transformed.
Compare respiration with other processes listed: Sedimentation involves the deposition of particles, photosynthesis absorbs carbon dioxide to produce glucose, and absorption by plants involves taking in nutrients. None of these processes release carbon back into the atmosphere like respiration does.
Conclude that respiration is the process that returns carbon to the atmosphere, demonstrating the Law of Conservation of Mass, as it involves the transformation and release of carbon dioxide.
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