Difficulty: Hard

Average Score: 33%

How is mass affected in this reaction, according to the law of conservation of matter?

Rationale

The mass of water must equal the total mass of hydrogen and oxygen.

According to the law of conservation of matter, mass is neither created nor destroyed in a chemical reaction. Therefore, the total mass of the products (water) must equal the total mass of the reactants (hydrogen and oxygen) combined before the reaction occurs.

A (The mass of water must equal the total mass of hydrogen and oxygen.) CORRECT

This statement accurately reflects the law of conservation of matter, as it asserts that the mass of the products (water) must equal the combined mass of the reactants (hydrogen and oxygen). This principle is fundamental in chemical reactions and ensures that all atoms are accounted for in the transformation from reactants to products.

B (The mass of hydrogen must equal the total mass of water.) YOUR ANSWER

This choice is incorrect because it implies that only the mass of hydrogen is relevant in comparison to the total mass of water produced. In reality, both hydrogen and oxygen together contribute to the mass of the water, and thus the mass of hydrogen alone cannot equal the mass of the water formed.

C (The mass of hydrogen must equal the total mass of oxygen.) YOUR ANSWER

This option is incorrect as it suggests a direct equality between the mass of hydrogen and the mass of oxygen. In a typical reaction forming water from hydrogen and oxygen, the two elements are not present in equal masses; rather, they combine in a specific ratio (2:1 by volume, for example) to produce water.

D (The mass of oxygen must equal the total mass of water.) YOUR ANSWER

While the mass of oxygen is a component of the total mass of water, this statement is misleading. It ignores the contribution of hydrogen in the reaction, which is essential for producing water. Thus, the mass of oxygen alone cannot equal the total mass of water produced.

Conclusion

The law of conservation of matter mandates that in any chemical reaction, including the formation of water from hydrogen and oxygen, the total mass must remain constant. Therefore, the mass of water produced must equal the combined mass of hydrogen and oxygen used in the reaction. Other statements incorrectly isolate the masses of individual components without recognizing the complete system's balance. Understanding this principle is crucial for accurately analyzing chemical reactions and their outcomes.

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