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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 heat change during a process carried out at a constant pressure.






2. The degree of randomness of a system is represented by a thermodynamic quantity called? the greater the randomness - the greater the _______.






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






4. Metals have electronegativities less than ____






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






6. *The nature of the reactants and products affect chemical reactions because some elements and compounds have bonds that when broken/formed - react more rapidly with each other than others.






7. This process occurs when the system is thermally isolated so that no heat enters or leaves.






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






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






10. **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.






11. Liquids with strong attractive forces have ______ boiling points.






12. In an endothermic process - energy is absorbed and ^E is _______.






13. A chemical reaction where there is an actual exchange of partners to form new compounds. ex: AgNO3 + NaCl -> AgCl + NaNO3.






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






15. *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.






16. The freezing point is always lowered by addition of solute.






17. A process that occurs whent eh system is maintained at constant pressure.






18. *The Concentration usually _____ the chemical reaction rate with increasing concentrations of the reactants.






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






20. A hypothetical gas would follow Boyles law under all conditions and is called?






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






22. The general shape of any molecule can be predicted from the number of bonding and non-bonding electron pairs in the valence shell of the central atom. nonbonded pairs of electrons (lone pairs) are more repellent than bonded pairs.






23. This law states that the entropy of any pure - perfect crystal at absolute zero is equal to zero.






24. **As we proceed to the right of the table - ______-forming properties decrease and _____-forming properties increase.






25. Cells that convert electrical energy into chemical energy.






26. 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.






27. The amount of heat energy required to raise the temperature of a given quantity of a substance one degree celcius.






28. For most substances - when a hot concentrated solution is cooled - the excess solid ________. This is useful in purification of the solute.






29. In a closed system - when the rates of evaporation and condensation are equal - the system is in ____ ______.






30. 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.






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






32. The temperature at which a substance's solid and liquid phases are in equilibrium.






33. 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.






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






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






36. The relatively weak attractive forces between molecules that are apparent only when the molecules approach one another closely (usually at low temperatures and high pressure).






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






38. Because of the low intermolecular forces - the melting points are low and evaporation takes place so easily that it may occur at room temperature.






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






40. The vapor pressure of an aqueous solution is always lowered by the additon of more solute - which causes the boiling point to be raised.






41. 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.






42. In a closed system - when opposing changes are taking place at equal rates - the system is said to be in _____ _______.






43. 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 _____ _






44. Increasing the pressure on a system at equilibrium will cause a shift in the position of equilibrium in the direction of the fewest number of ______ of gaseous reactants or products.


45. The normal boiling point of a liquid is the temperature at which its vapor pressure is 760mm Hg.






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






47. A chemical reaction formed from the union of its elements.






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






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






50. *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.