Multiple Choice
Which of the following is an example of a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following best describes a heterogeneous mixture?
A
Table salt (NaCl) dissolved completely in water
B
A salad containing lettuce, tomatoes, and cucumbers
C
Pure water (H_2O)
D
Oxygen gas (O_2)
Verified step by step guidance1
Step 1: Understand the definition of a heterogeneous mixture. A heterogeneous mixture is a mixture in which the components are not uniformly distributed and can be visually distinguished.
Step 2: Analyze each option to see if the components are uniformly mixed or visibly distinct.
Step 3: For table salt (NaCl) dissolved completely in water, the salt ions are evenly distributed at the molecular level, forming a homogeneous mixture (a solution).
Step 4: Pure water (H_2O) and oxygen gas (O_2) are pure substances, not mixtures, so they do not fit the definition of a heterogeneous mixture.
Step 5: A salad containing lettuce, tomatoes, and cucumbers has visibly distinct parts that are not uniformly mixed, making it a classic example of a heterogeneous mixture.
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