State whether the entropy of the system increases or decreases in each of the following processes: Pure gases are mixed to prepare an anesthetic.

Which ion has the lower ratio of charge to volume? Explain.

$Br^- or I ^- \quad$

Use the following data to calculate the combined heat of hydration for the ions in sodium acetate (NaC2H3O2): $\Delta$ Hlattice = 763 kJ/mol $\Delta$Hsoln = 17.3 kJ/mol.

Besides its use in making black-and-white film, silver nitrate (AgNO3) is used similarly in forensic science. The NaCl left behind in the sweat of a fingerprint is treated with AgNO3 solution to form AgCl. This precipitate is developed to show the black-and-white fingerprint pattern. Given $\Delta$ Hlattice of AgNO3 = 822 k/mol and $\Delta \mathrm { Hhydr }$ = -799 kJ/mol, calculate its $\Delta \mathrm { Hsoln }$

For a saturated aqueous solution of each of the following at $20 ^ { \circ } \mathrm { C }$ and 1 atm, will the solubility increase, decrease, or stay the same when the indicated change occurs? He(g), decrease T.

Which ion in each pair has greater charge density? Explain.

$Na^+$ or $Cs^+$

Calculate the molarity of each aqueous solution: 0.82 g of ethanol (C2H5OH) in 10.5 mL of solution

State whether the entropy of the system increases or decreases in each of the following processes: Ethanol (CH3CH2OH) dissolves in 1-propanol (CH3CH2CH2OH).

Histones are proteins that control gene function by attaching through salt links to exterior regions of DNA. Name an amino acid whose side chain is often found on the exterior of histones.

Use the following data to calculate the combined heat of hydration for the ions in potassium bromate (KBrO3): $\Delta \text { Hlattice } = 745 \mathrm { k } / \mathrm { mol } \Delta \mathrm { Hsoln } = 41.1 \mathrm { kJ } / \mathrm { mol }$

Arrange the following substances in order of increasing solubility in hexane, $\mathrm{C}_6 \mathrm{H}_{14}: \mathrm{CH}_2 \mathrm{OHCH}_2 \mathrm{OH}$, $\mathrm{C}_{10} \mathrm{H}_{22}, \mathrm{H}_2 \mathrm{O}$.

What is the strongest type of intermolecular force between solute and solvent in each solution? C6H14(I) in C8H18(I),

What is the strongest type of intermolecular force between solute and solvent in each solution?

CH3OCH3(g) in H2O(I),

What intermolecular forces stabilize a lipid bilayer?