| 1. Solid carbon dioxide, dry ice , changes directly from a solid to a vapor at 195 K if left in an open container. what is this temperature in degrees Celsius and Fahrenheit? | |
| a) | 78 degrees C, 468 degrees F | b) | 108 degrees C, 468 degrees F | c) | 468 degrees C, 108 degrees F | d) | 78 degrees C, 108 degrees F |
| 2. Which particle helped to explain discrepancies in atomic weights observed by early nineteenth century chemists? | |
| a) | Neutron | b) | Atom | c) | Electron | d) | Proton |
| 3. Which charged particle is not found in the 1+ ion of the lightest element known? | |
| a) | Neutron | b) | atom | c) | Electron | d) | Molecule |
| 4. When a solid substance undergoes a physical change to a liquid, which of the following is always true? | |
| a) | Heat is given off | b) | A gas is given off | c) | It vaporizes | d) | It melts |
| 5. Passing an electrical charge through argon gas contained in a partially evacuated vessel yields which of the following? | |
| a) | A continuous spectrum | b) | A line spectrum | c) | No visible change | d) | White llight |
| 6. According to the Bohr model of the atom, emission of electromagnetic radiation by heated atoms in a vacuum is directly due to which of the following? | |
| a) | Particle emission from the nucleus | b) | Momentum possessed by electrons | c) | Electrons being excited from an inner to outer orbit | d) | Electrons falling from an outer to inner orbit |
| 7. How many electrons are there in the outermost shell of aresenic? | |
| a) | 3 electrons | b) | 6 electrons | c) | 4 electrons | d) | 5 electrons |
| 8. How many electrons in an atom can possess an n=3 principal quantum number? | |
| a) | 6 | b) | 8 | c) | 10 | d) | 18 |
| 9. When a basic oxide reacts with water, which of the following is always formed? | |
| a) | a nonmetal | b) | Oxide ion | c) | hydroxide ion | d) | a and b |
| 10. Which element in the carbon family has the most metallic character? | |
| a) | C | b) | Si | c) | Ge | d) | Pb |
| 11. If the density of a gas is 0.08987 g/L at STP conditions, what is its molecular weight? | |
| a) | 0.08987 g | b) | 2.01g | c) | 249 g | d) | 100 g |
| 12. Which of the following statements about the density of a gas is correct? | |
| a) | It is independent of temperature | b) | It decreases with increasing temperature at constant pressure | c) | It is independent of pressure | d) | It decrases with increasing pressure at constant temperature |
| 13. Which of the following is a region in the atmosphere in which temperature reaches a maximum value? | |
| a) | Stratosphere | b) | Mesopause | c) | Stratopause | d) | None of the above |
| 14. At 1 atm external pressure, water can exist at 100 degrees as | |
| a) | Only a solid | b) | Only a liquid | c) | Only a gas | d) | Both a liquid and a gas |
| 15. Which of the following intermolecular forces is important only at the shortest distances between interacting particles? | |
| a) | On-ion | b) | London dispersion forces | c) | ion-dipole | d) | ion-induced dipole |
| 16. The presence of nonvolatile solute in a volatile solvent will result in which of the following? | |
| a) | It will raise the freezing point and lower the vapor pressure and boiling point | b) | It will lower the freezing point and raise the vapor pressure and boiling point | c) | It will raise the freezing point, vapor pressure, and boiling point | d) | It will lower the freezing point vapor pressure and will raise the boiling point |
| 17. A catalyst increases the rate of a reaction by doing which of the following? | |
| a) | Increasing reactant concentrations | b) | Increasing temperature | c) | Decreasing temperature | d) | Decreasing activation energy of reaction |
| 18. The burning of paper is an exothermic process. However, for paper to burn, it must be brought up to a temperature equal to or greater than its kindling temperature. Once the required activation energy has been provided, which of the following will cause the paper to continue burning? | |
| a) | Energy absorbed from the atmosphere | b) | The heat released during the reaction | c) | Paper molecules colliding together | d) | Low activation energy of paper |
| 19. For a system to be at equilibrium, the relationship between reaction quotient, Q, and equilibrium constant is which of the following? | |
| a) | Q=K=1 | b) | Q=K=0 | c) | Q=K | d) | Q>K |
| 20. Which of the following is not affected when a catalyst influences a gaseous chemical reaction? | |
| a) | Forward and reverse reaction rates | b) | Initial reaction rate | c) | Value of activation energy | d) | Value of equilibrium constant |
| 21. Which of the following is not a characteristic of Bronsted base? | |
| a) | Often taste sour or bitter | b) | Always contain hydroxyl ions | c) | Form hydroxyl ions in water | d) | React with Bronsted acids |
| 22. How can the boiling point of water be lowered in a multistage flash-distillation desalination process? | |
| a) | Increasing distillation temperature | b) | Decreasing distillation temperature | c) | Decreasing distillation pressure | d) | Increasing vo;ume of solution being distilled |
| 23. Which of the following elements is removed in the tertiary treatment of municipal sewage water but not usually removed in the primary and secondary treatment stages? | |
| a) | C | b) | S | c) | H | d) | P |
| 24. How is the mass defect for a nucleus calculated? | |
| a) | Atomic weight of the element minus mass number | b) | Atomic weight of the element minus mass of nucleons | c) | Nuclear mass minus mass of nucleons | d) | none of the above |
| 25. Solid carbon dioxide, dry ice , changes directly from a solid to a vapor at 195 K if left in an open container. what is this temperature in degrees Celsius and Fahrenheit? | |
| a) | 78 degrees C, 468 degrees F | b) | 108 degrees C, 468 degrees F | c) | 468 degrees C, 108 degrees F | d) | 78 degrees C, 108 degrees F |