Praxis 5005 Practice Test Practice Question
Which of the following is a pure substance?
Correct Answer: C
Rationale: A pure substance consists of a single type of particle and has consistent properties throughout. Sodium chloride crystals (C) exemplify this, as they are composed solely of sodium and chloride ions in a fixed ratio, exhibiting uniform characteristics.
Granite rock (A) is a mixture of various minerals, making it impure. Toothpaste (B) contains multiple ingredients for different purposes, such as abrasives and flavoring agents, thus disqualifying it as a pure substance. Sugar water (D) is a solution where sugar is dissolved in water, resulting in a mixture rather than a single substance.
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