AP Chemistry Flashcards: Separation of Solutions and Mixtures
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
When distilling a mixture of water (boiling point 100°C) and ethanol (boiling point 78°C), which substance will be more concentrated in the initial vapor?
Ethanol will be more concentrated in the initial vapor because its weaker intermolecular forces give it a higher vapor pressure and a lower boiling point than water.
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When distilling a mixture of water (boiling point 100°C) and ethanol (boiling point 78°C), which substance will be more concentrated in the initial vapor?
Ethanol will be more concentrated in the initial vapor because its weaker intermolecular forces give it a higher vapor pressure and a lower boiling point than water.
What is the key difference between the properties exploited by chromatography and distillation for separation?
Chromatography exploits differential affinities (IMFs) for a mobile and stationary phase, while distillation exploits differences in vapor pressure.
Define Distillation.
Distillation is a separation process that separates components of a liquid mixture based on differences in their vapor pressures, which are affected by their intermolecular forces.
In a chromatography experiment with a polar stationary phase, which would travel farther: a polar molecule or a nonpolar molecule?
The nonpolar molecule would travel farther because it has weaker intermolecular interactions with the polar stationary phase and is carried along more easily by the mobile phase.
How do intermolecular forces (IMFs) drive separation in distillation?
Substances with weaker IMFs have higher vapor pressures and boil at lower temperatures, allowing them to vaporize and be separated from substances with stronger IMFs.
How do intermolecular forces (IMFs) drive separation in chromatography?
Components with stronger IMFs with the stationary phase move more slowly, while components with stronger IMFs with the mobile phase move more quickly, causing them to separate.
Why is simple filtration not suitable for separating the components of a liquid solution?
Filtration cannot separate the components of a liquid solution because the solute particles are fully dissolved and are too small to be captured by a filter.
Define Chromatography.
Chromatography is a separation technique that separates species based on their differential intermolecular forces (IMFs) with a mobile phase and a stationary phase.
What is the fundamental principle used to separate components of a liquid solution?
The separation of liquid solution components is based on exploiting the differences in their intermolecular interactions.
How do the results of a separation experiment provide evidence for the existence of intermolecular interactions?
The successful separation of components demonstrates that they possess different strengths of intermolecular forces, which cause them to behave differently during the process (e.g., different boiling points or affinities).