Multiple Choice
Which of the following is a primary purpose of chromatography in chemical analysis?
4. BONUS: Lab Techniques and Procedures
Chromatography
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Which of the following techniques separates molecules based on size?
A
Chromatography
B
Distillation
C
Filtration
D
Evaporation
Verified step by step guidance1
Understand the basic principle of each technique: Chromatography separates substances based on their movement through a medium, distillation separates based on boiling points, filtration separates based on particle size, and evaporation involves the phase change from liquid to gas.
Identify the key characteristic of the separation method: In this case, we are looking for a technique that separates molecules based on size.
Analyze the options: Chromatography can separate based on size, charge, or affinity, but it is not primarily size-based. Distillation is based on boiling points, not size. Filtration is specifically designed to separate based on particle size. Evaporation is a phase change process, not a size-based separation.
Focus on filtration: Filtration involves passing a mixture through a filter that allows smaller particles to pass through while retaining larger particles, making it a size-based separation technique.
Conclude that filtration is the correct technique for separating molecules based on size, as it directly involves the use of a physical barrier to separate particles of different sizes.
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