The structure of micelles that is formed when sodium dodecylsulfate (SDS) is dissolved in water needs to be determined. Concept Introduction: On the basis of composition, all matter can be classified as pure substances and mixture. Element, molecule and compound are examples of pure substances. Mixtures are composed of more than one substances. Solution is a mixture of solute and solvent. On the basis of particle size, solution can again classified as true solution, colloidal and suspensions. True solution has very small size of particles that is approximately 1 nm whereas the particle size in colloidal solution is between 1-100 nm.

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5. Compressibility (6 points total). The isothermal compressibility is a measure of how hard/easy it is to compress an object (how squishy is it?) at constant temperature. It is др defined as Br=-()=-(200²)T' (a) You might wonder why there is a negative sign in this formula. What does it mean when this quantity is positive and what does it mean when this quantity is negative? (b) Derive the formula for the isothermal compressibility of an ideal gas (it is very simple!) (c) Explain under what conditions for the ideal gas the compressibility is higher or lower, and why that makes sense.

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Question

Chapter 17, Problem 94AE

Interpretation Introduction

Interpretation: The structure of micelles that is formed when sodium dodecylsulfate (SDS) is dissolved in water needs to be determined.

Concept Introduction: On the basis of composition, all matter can be classified as pure substances and mixture. Element, molecule and compound are examples of pure substances. Mixtures are composed of more than one substances. Solution is a mixture of solute and solvent. On the basis of particle size, solution can again classified as true solution, colloidal and suspensions. True solution has very small size of particles that is approximately 1 nm whereas the particle size in colloidal solution is between 1-100 nm.

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