2. Soaps (surfactants) are amphiphilic, meaning they have both polar and nonpolar domains. For example, when you use Dawn dishwashing soap to clean dishes, the main molecule in the soap, sodium dodecyl sulfate (SDS), will form a foam as you scrub. Let's imagine the simplified scenario in which we only have SDS, water and air. Draw how the You can use the SDS molecule will orient itself at the air-water interface following simplified diagram to represent SDS. hydrophobic air water hydrophilic

25.0 cm' of 2.0 mol dm- hydrochloric acid, HCI, was added to 50.0 cm' of2.0 mol dm-3sodium hydroxide, NaH. The starting temperature was 22 °C andthe maximum temperature reached was 29 °C. Equation 3.1 below can be usedto calculate the enthalpy change of neutralisation:Equation 3.1q= mcATwhere c=4.18Jg-1 K-1aWrite an equation for the neutralisation reaction taking place.

3. Maximum solubility of an ionic compounds in water depend on different sets of conditions. Out of five sets of conditions (given below), which one is the best for getting maximum solubility? A. The magnitude of the lattice energy should be large, and the enthalpy of hydration of the ions should be large. B. The enthalpy of hydration (Delta H) of the cation should be equal to the enthalpy of hydration of the anion, regardless of the magnitude of the lattice energy C. The magnitude of the lattice energy should be small, and the enthalpy of hydration of the ions should be small.   D. The magnitude of the lattice energy should be small, and the enthalpy of hydration of the ions should be large. E. The magnitude of the lattice energy should be large, and the enthalpy of hydration of the ions should be small.

Which of these compounds will be most soluble in aqueous 0.1 M NaOH? The solubility of a compound is enhanced by favourable non-covalent interactions with the water. A deprotonation reaction is possible for one of these compounds that leads to an ionic compound. Ions have very strong non-covalent interactions with water. Select one: O₂N CO₂H