To determine the correct statement about the original cool liquid when a single salt crystal is added, let's analyze the options:
A. The liquid is a homogeneous mixture because the substance formed large crystals was uniformly dissolved.
- This could be true if the liquid was indeed a solution before the crystal was added. However, the formation of large crystals may indicate that the solution was saturated rather than uniformly dissolved.
B. The liquid is a heterogeneous mixture because the crystals can be easily separated from the liquid.
- This is not correct when the liquid is described as initially having the ability to dissolve the salt well until saturation; it suggests that the liquid form a uniform solution.
C. The liquid is a pure substance because it was made up of a single compound.
- This cannot be definitively concluded without knowing the composition of the liquid.
D. The liquid is a pure substance because it was uniform before the crystal was added.
- While uniformity is a characteristic of pure substances, this option does not clearly establish that the original liquid was a pure substance just because it was uniform.
Given the options, if the liquid was able to dissolve the salt, it more aligns with option A about it being a homogeneous mixture. However, as there may be a chance the system is saturated (which may imply it is on the borderline of being saturated and thus could potentially lead to the presence of undissolved solute), the least misleading that draws attention to the concept of uniformity without definitive composition is option D; it suggests a level of consistency but does not assert purity.
Thus, considering all information, A is the most accurate statement: "The liquid is a homogeneous mixture because the substance formed the large crystals was uniformly dissolved."
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