Scelta multipla
Which of the following is a mixture that has a uniform concentration throughout?
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6. Chemical Quantities & Aqueous Reactions
Solutions
Scelta multipla
Which statement best describes a solution in a beaker containing dissolved NaCl in water?
A
It is a homogeneous mixture of NaCl and water.
B
It is a suspension of NaCl particles in water.
C
It is a heterogeneous mixture of NaCl and water.
D
It is a pure substance consisting only of NaCl.
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Understand the definition of a solution: A solution is a homogeneous mixture where the solute (NaCl) is completely dissolved in the solvent (water), resulting in a uniform composition throughout.
Recall that a suspension is a heterogeneous mixture where particles are large enough to eventually settle out, which is not the case for dissolved NaCl in water.
Recognize that a heterogeneous mixture has visibly distinct parts or phases, which does not apply here because dissolved NaCl forms a uniform phase with water.
Note that a pure substance consists of only one type of particle or compound, so a mixture of NaCl and water cannot be a pure substance.
Conclude that the best description is that the beaker contains a homogeneous mixture of NaCl and water, which is the definition of a solution.
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