Day1 From Gelo

CHEMICAL AND PHYSICAL PRINCIPLES 1. The ion that would be iso-electronic with the noble gas Xenon is: a. I-2 b. S-2 c. Mg+2 d.K+1 2. No two elements in the same atom can have the same set of quantum is a statement of a. Hund’s Rule of Multiplicity b. Dalton’s Atomic Theory c. Heisenberg’s Uncertainty Principle d. Pauli’s Exclusion Principle 3. Defines as acid as a compound that dissolves in water to produce the H+ ions is a. Arthenius c. Lewis b. Bronsted-Lowry d. Lowry 4. The electrons of metals are free to move in a solid. This explains why a. metals are unstable b. metals can easily be melted c. metals have high reflectivity d. metals have high conductivity 5. Buffer solution resists changes in acidity. If an acid is added to a buffer solution, the ______________ remains the same a. pH b. concentration c. ionization constant d. hydrolysis constant 6. In silver plating, the anode is a. copper d. graphite b. the object to be plated e. silver c. platinum 7. Brass is an alloy of a. aluminum and nickel c. copper and zinc b. lead and tin d. copper and tin 8. The first step in precipitation is the formulation of a. Nuclei c. Seeds b. Supersaturated solution d. Crystals 9. Which will dissolve faster in coffee? a. lump sugar in hot coffee b. granular sugar in hot coffee c. granular sugar in cold coffee d. lump sugar in cold coffee 10. The most important component of pitch blend a. Lead c. Uranium b. Mercury d. Gold 11. A catalyst is a substance that a. increases the rate of reaction b. is independent on the concentration of the reactants c. has no effect on the activation energy d. is recovered chemically unchanged at the end of the reaction 12. Which of the following are most alike? a. compound and suspension b. mixture and compound c. foam and solution d. solution and compound e. emulsion and colloid 13. An element having three valence of electrons and four main energy levels may belong to a. Family III-A c. Family VII-A b. Period 3 d. Family IV-A 14. The mass contribution of an electron in an atom is a. 1/1,837 that of the proton b. equal to that of a proton c. equal to that of a neutron d. not known 15. The percentage abundance of Xe in the atmosphere (% Volume) is a. 1.4 x 10-4 c. 1.32 % b. 8.0 x 10-6 d. 93%

16. Discovered water by exploding H2 + O2 a. Lewis c. Scavendish b. Lavoisier d. Usey 17. A solution of a weak acid and its salt which resists appreciable changes in pH value is called a. normal solution b. colloidal dispersion c. neutral solution d. buffer solution e. molar solution 18. The type in intermolecular force of attraction which exists between molecules of oxygen, nitrogen of methane is a. dipole-dipole c. H-bonding b. London d. Interionic 19. Which of the following is insoluble in H2O? a. aluminum sodium silicate b. aluminum sulfate c. ammonium oxalate d. ammonium bromide 20. Arrange Ca, Be and Mg according to increasing electron affinity a. Mg