Q: 1. Distinguish intramolecular forces of attraction and intermolecular forces of attraction.
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Which statement about bulk properties of matter and the electrostatic forces between molecules is correct?
- The bulk properties of a material determine the strength of the electrostatic forces between molecules.
- Bulk properties can be changed to strengthen or weaken the electrostatic forces between molecules in a material.
- The bulk properties of a material can be inferred by measuring the strength of the electrostatic forces between molecules.
- Bulk properties can be used to compare the strength of electrostatic forces between molecules in different materials.
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- What is the best description of conductivity? Choose one: The ability of a substance to break apart into ions The presence of charged ions in a substance The amount of electricity present in a substance The degree to which electricity passes through a substanceis the study of fundamental principles of nanostructures between bulk and atomic properties.What is the advantage of using superficially porous particles?
- Choices: I only II only III only I and II II and III I and III I, II, III None of the above 5. SURFACE TENSION: I. A decrease is due to the weakening of the hydrogen bonds of water molecules II. It is increased when a surfactant is added III. Soap lowers surface tension of water resulting to the shrinkage of molecules on the surface 6. SAPONIFICATION: I. Can be carried out with HCl II. NaOH undergoes hydrolysis III. Its principle is used to determine the number of milligrams of KOH required to neutralize the fatty acids from the complete hydrolysis of 1g of fat 7. HYDROGENATION: I. Involves hydrogen addition across carbon-carbon double bonds II. The removal of a double bond results to an increase in melting point III. Favors the absorption of vitamins in the structure 8. RANCIDITY: I. Oxygen acts as an oxidizing agent at carbon to carbon double bonds II. The products are glycerol and carboxylic acids III. Can be carried out by a certain…Based on the kinetic molecular model, solids usually have higher densities compare two liquids. However, ice , a solid form of H2O floats on liquid water which means ice is less dense than water. What do you think is the reason for this phenomenon? What is the biological significance of this concept?Complete the table below. Identify the polarity and the type of intermolecular forces of the following substances. Substance Polar/Nonpolar London Dispersion Forces Dipole-Dipole Hydrogen Bonding Hydrogen Flouride Propane Formaldehyde Ammonia
- Describe one thing that is special about the bonds between Oxygen and hydrogen in a water molecule that makes hydrogen-bonding possible.Which of the following best explains how a spider could float on a water surface? Adhesive forces between water and spider legs are greater than cohesive forces between water molecules. Molecules at the surface of a body of water possess higher potential energy than those in the bulk. Water molecules possess certain level of cohesive forces that needs to be overcome before water surface is broken into.Explain each of these properties of water, and describe how each is conferred by the dipolar nature of a water molecule: high specific heat capacity; high heat of vaporization; unique density behavior; high surface tension; capacity to be a good solvent for ions of salts.
- Describe the attractive forces between the atoms in a molecule and between molecules.What would be the predominant force of attraction between molecules of CS2? Dipole-dipole forces Covalent bonding Hydrogen bonding London dispersion forcesIdentify the true statements about surface tension. Molecules along the surface of a liquid behave differently than those in the bulk liquid. Surface tension increases as the temperature of the liquid rise. Cohesive forces attract the molecules of the liquid to one another. Water forming a droplet as it falls from a faucet is a primary example of surface tension. Mercury has a lower surface tension than water.