Question

Essex County College Division of Biology and Chemistry General Chemistry II Problem Set I CHM 10 1. Which of the following mixtures have components which can be separated by filtration? A) colloids B) solutions D) all of these 2. In most liquid solutions, the component present in the larger amount is called the A) dispersed medium B) emulsifying agent C) solute D) solvent 3. lodine, 12(s), is more soluble in dichloromethane, CHCI than in water because A) both iodine and dichloromethane have strong ion-dipole B) the dipole-dipole forces in dichloromethane are much stronger than the dispersion forces in iodine. C) the intermolecular forces are similar in both iodine and D) iodine is polar and dichloromethane has a large number of hydrogen bonds. 4. Commercial cold packs often contain solid NH4NO3 and a pouch of water. The temperature of the pack drops as the NHANO dissolves in water. Therefore, for the dissolving of NH4NO3 in A) AHsoln is negative and ASsoln may be negative or positive. B) AHsoln is negative and ASsoln is positive C) ΔΗ soln is positive and ASsoln may be negative or positive. D) AHsoln is positive and ASsoln is positive 5. When a particular solid begins to dissolve in water, the temperature rises dramatically. For the dissolving of this solid in pure water Α) Δ//soln is always negative and ASsoln may be negative or Β) Δ//soln is always negative and ASsoln is always positive. C) Δ//soln is always positive and ASsoln may be negative or D) AHsoln is always positive and ASsoln is always positive 6. One reason ionic compounds do not dissolve well in nonpolar solvents is that A) ion-dipole interactions are too large for effective solvation to B) ion-solvent interactions are not strong enough to solvate the ions in solution. C) not all cations and anions have the same magnitude of charge and therefore do not form neutral ion pairs. D) there are no forces of attraction between ions and nonpolar 7. Most gases become less soluble in water as the temperature increases. What can be concluded about the signs of AHsoln and ΔSsoln in this case? A) Δ/fsoIn is negative and ASsoln is negative. B) AHsoln is negative and ASsoln is positive C) AHsoln is positive and ASsoln is negative. D) Δ//soln is positive and ASsoln is positive. 8. Which of the following should most favor the solubility of an ionic solid in water? A) a low lattice

Answer 1

Ans 1 : C) Suspensions

Suspensions are the mixture though homogenous , by the particles sizes of the solute is more than 1000 nm. Due to this reason , the solute tends to seperate out or settle down in the bottom when left to stand for a longer period of time.

So the suspension components can be seperated out through filteration.