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Chemical changes Transitional Reasoning Practice

Chemistry · Matter · Chemistry · Properties & Changes of Matter

1 Chemistry practice questions on Chemical changes. Questions that build towards applied reasoning.

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Questions

  1. 1.

    A student mixes two clear, colorless aqueous solutions in a sealed flask placed on an electronic balance. Immediately, an insoluble yellow solid forms, the temperature of the mixture increases, and the total mass recorded on the balance remains unchanged. Based on these observations, which conclusion accurately explains why a chemical change occurred?

    • A) A new chemical substance with distinct properties formed through a rearrangement of atoms, while the total number and type of atoms remained conserved.
    • B) The formation of a solid precipitate indicates a physical phase transition of one dissolved solute caused solely by a decrease in solvent solubility.
    • C) The increase in temperature proves that a measurable amount of matter was converted directly into thermal energy during the process.
    • D) The unchanging total mass confirms that no chemical bonds were broken or formed between the reacting species.

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