Textbook Question
(a) Two pans of water are on different burners of a stove. One pan of water is boiling vigorously, while the other is boiling gently. What can be said about the temperature of the water in the two pans?
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Ch.11 - Liquids and Intermolecular Forces
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement111
- Ch.2 - Atoms, Molecules, and Ions166
- Ch.3 - Chemical Reactions and Reaction Stoichiometry138
- Ch.4 - Reactions in Aqueous Solution127
- Ch.5 - Thermochemistry104
- Ch.6 - Electronic Structure of Atoms109
- Ch.7 - Periodic Properties of the Elements107
- Ch.8 - Basic Concepts of Chemical Bonding102
- Ch.9 - Molecular Geometry and Bonding Theories120
- Ch.10 - Gases122
- Ch.11 - Liquids and Intermolecular Forces79
- Ch.12 - Solids and Modern Materials102
- Ch.13 - Properties of Solutions99
- Ch.14 - Chemical Kinetics153
- Ch.15 - Chemical Equilibrium83
- Ch.16 - Acid-Base Equilibria109
- Ch.17 - Additional Aspects of Aqueous Equilibria117
- Ch.18 - Chemistry of the Environment60
- Ch.19 - Chemical Thermodynamics109
- Ch.20 - Electrochemistry113
- Ch.21 - Nuclear Chemistry79
- Ch.22 - Chemistry of the Nonmetals52
- Ch.23 - Transition Metals and Coordination Chemistry57
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry7
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Not the one you use?Change textbook
Chapter 11, Problem 50c
The critical temperatures and pressures of a series of halogenated methanes are as follows: (c) Predict the critical temperature and pressure for CCl4 based on the trends in this table. Look up the experimentally determined critical temperatures and pressures for CCl4, using a source such as the CRC Handbook of Chemistry and Physics, and suggest a reason for any discrepancies.
Verified step by step guidance1
Identify the trend in critical temperatures and pressures for the given series of halogenated methanes.
Analyze how the molecular structure and intermolecular forces of CCl4 compare to those of the other halogenated methanes.
Predict the critical temperature and pressure for CCl4 based on the observed trends and molecular analysis.
Look up the experimentally determined critical temperature and pressure for CCl4 from a reliable source like the CRC Handbook of Chemistry and Physics.
Compare the predicted values with the experimental values and suggest reasons for any discrepancies, considering factors like molecular size, shape, and intermolecular forces.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Critical Temperature and Pressure
Critical temperature is the highest temperature at which a substance can exist as a liquid, while critical pressure is the minimum pressure required to maintain that liquid state at the critical temperature. Above these values, the substance becomes a supercritical fluid, exhibiting unique properties. Understanding these concepts is essential for predicting phase behavior in substances like halogenated methanes.
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Trends in Halogenated Methanes
Halogenated methanes, such as CCl4, exhibit trends in their critical properties based on molecular structure and intermolecular forces. Generally, as the size and number of halogen atoms increase, the critical temperature and pressure also tend to increase due to stronger van der Waals forces. Recognizing these trends allows for informed predictions about the critical properties of similar compounds.
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Experimental vs. Theoretical Values
Discrepancies between experimentally determined and predicted critical temperatures and pressures can arise from various factors, including measurement errors, purity of the sample, and the limitations of theoretical models. Understanding these potential sources of error is crucial when comparing predicted values with literature data, as it helps in assessing the reliability of the predictions made.
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Related Practice
Textbook Question
(a) Place the following substances in order of increasing volatility: CH4, CBr4, CH2Cl2, CH3Cl, CHBr3, and CH2Br2. (b) How do the boiling points vary through this series? (c) Explain your answer to part (b) in terms of intermolecular forces.
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Textbook Question
The critical temperatures and pressures of a series of halogenated methanes are as follows:
(a) List the intermolecular forces that occur for each compound.
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