Multiple Choice
In the classification of matter, what are the three domains?
1. Intro to General Chemistry
Classification of Matter
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Which of the following processes demonstrates the Law of Conservation of Mass?
A
Evaporation of water leading to a decrease in mass
B
Melting of ice resulting in a loss of mass
C
Rusting of iron increasing the mass of the object
D
Burning of wood resulting in ash and smoke
Verified step by step guidance1
Understand the Law of Conservation of Mass: This law states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.
Analyze the process of burning wood: When wood burns, it reacts with oxygen in the air to form ash, smoke, and gases like carbon dioxide and water vapor.
Consider the mass before and after burning: Initially, the mass includes the wood and the oxygen it will react with. After burning, the mass includes the ash, smoke, and gases produced.
Apply the Law of Conservation of Mass: Even though the wood seems to lose mass as it turns to ash and smoke, the total mass of the system (wood + oxygen = ash + smoke + gases) remains constant.
Conclude that burning wood demonstrates the Law of Conservation of Mass: The mass of the reactants (wood and oxygen) is equal to the mass of the products (ash, smoke, and gases), illustrating the conservation of mass.
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