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CLEP Chemistry 1

Subjects : clep, science, chemistry
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The amount of heat energy required to raise the temperature 1g of a substance by 1 degree celcius.






2. The heat required to change 1mole of solid completely to vapor.






3. In a _______ expansion of a gas - the opposing pressure is virtually equal to the pressure exerted by the gas. It is ______ because any slight increase in the external pressure will reverse the process and cause compression to occure.






4. A solution in which solid solute is in equilibrium with dissolved solute.






5. When an electron moves from an excited state to the ground state - it _______ energy.






6. When solids are heated at certain perssures - some solids vaporize directly without passing through the liquid phase.






7. The ______ of the system is some particular set of conditions of pressure - temperature - number of moles of each component - and their physical form (ex: gas - liquid - solid or crystalline form).






8. This law states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the gases in mixture.






9. Metals have electronegativities less than ____






10. Real gases act in a less than ideal way - especially under conditions of increased pressure and/or decreased temperture. Real gas behavior approaches that of ideal gases as the gas pressure becomes very low. The ideal gas is thus considered a _____ _






11. For a solution in which a nonvolatile solute is dissolved in a solvent - the vapor pressure is due only to the vapor of the solvent above the solution. This vapor pressure is given by _______ law.

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12. *The temperature affects chemical reactions with an increase of ___degrees C above room temperature - causing the reaction rate to double.






13. Reactions that do not occur spontaneously can be forced to take place by supplying energy with an external current.






14. Any spontaneous change in a chemical reaction will decrease the amount of free energy toward _______ as the process proceeds towards equilibrium.






15. In titration - this point occurs when equal numbers of equivalents of acid and base have been reacted. The solution at this point is neutral because neither of the ions of the salt in solution undergoes hydrolysis.






16. A law that states that for a given mass of gas - the volume is proportional to the pressure and absolute temperature.






17. A theory of the hydrogen atom stating that the electron can exist in only certain stable energy levels and that when the electronic state of the atom changes - it must absorb or emit exactly that amound of energy equal to the difference betweent he f






18. *Each wave function corresponds to a certain electron energy and describes a region about the nucleus (orbital) where an electron having that energy may be found.






19. A law stating that at a constant temperature - the volume of a gas in inversely proportiona to the pressure.






20. **Proceeding across a period from left to right - the ionization energy _______.






21. The change in enthalpy of an endothermic reaction is ________.






22. The force with which the electrons flow from the negative electrode to the positive electrode through an external wire is called?






23. Electronegativities ________ from left to right in a period.






24. Heat added to a system and work done by a system are considered _________ quantities.






25. *The hypothetical ideal gas obeys exactly the mathematical statement of the ideal gas law. This statement is also called the _____ ___ ____ of an ideal gas because it relates the variables (P - V - n - T) that specify properties of the gas.






26. The freezing point - boiling point - and vapor pressure of a solution differ from those of the pure solvent by amounts which are directly proportional to the molal concentration of the solute.






27. Decreasing the concentrations of reactants shifts the equilibrium to the ______ - thus decreasing the concentration of products formed.

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28. The law stating that in any spontaneous process there is an increase in the entropy of the universe.






29. The most active metals are found in what corner of the periodic table?






30. When the rate of evaporation equals the rate of condensation - the system is in __________.






31. The vapor pressure increases with increasing _____.






32. In titration - this is the point at which a particular indicator changes color.






33. **Five factors that affect reaction rates: 1. The nature of the reactants and products. 2. The surface area exposed. 3. The concentrations. 4. The temperature. 5. The catalyst.






34. If this law was strictly obeyed - gases would not condense when they are cooled. This means that gases behave in an ideal fashion only at relatively high temperatures and low pressures.






35. Gases are composed of tiny - invisible molecules that are widely separated from one another in otherwise empty space.






36. Another way the second law is stated is that in any spontaneous change - the amount of free energy available ______.






37. The law stating that change in internal energy is equal to the difference between the energy supplied toi the system as heat and the energy removed from the system as work performed on the surroundings.






38. A law stating that at constant pressure - the volume of a given quantity of a gas varies directly with the temperature.






39. The molecules in a gas are in constant - continueous - random - and straight-line motion.






40. A law that states that under conditions of constant temperature and pressure - equal volumes of different gases contain equal numbers of molecules.






41. A state function in which it is the heat content of a substance.






42. The pressure exerted by the gas molecules when they are in equilibrium with the liquid.






43. Increase in the concentrations of reactants shifts the equilibrium to the ______ - thus increasing the amount of products formed.

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44. The pressure exerted by each gas in a mixture is called its _____ pressure.






45. The pressure of a gas is the result of collisions between the gas molecules and the walls of the container.






46. State ________ depend only on the present state of the substance and not on the path by which the present state was attained. Enthalpy - energy - Gibbs free energy - and entropy are examples.






47. The ________ of an element is a number that measerures the relative strength in which the atoms of the element attract valence electrons in a chemical bond - on a scale of 0-4.






48. When the electron moves from the ground state to an excited state - it ______ energy.






49. *The surface area exposed affect chemical reactions because most reactions depend on the reactants coming into contact - increasing the rate of the reaction.






50. Rays made up of electrons in basic electron charges.