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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. 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.






2. 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.






3. A catalyst affects a chemical reaction by lowering the _____ _____ for both the forward and the reverse reactions equally.






4. The molecules in a gas collide with one another - but the collisions are perfectly elastic (they result in no net loss of energy).






5. A catalyst lowers the ______ _____ _____ that must be overcome in order for the reaction to proceed. It merely speeds the approach to equilibrium but does not change Keq at all.

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






7. 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.






8. Electronegativities _______ as you go down a group.






9. The process of mixing different orbitals of the same atom to form a new set of equivalent orbitals.






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






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






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






14. *Molecules of ideal gases have no attraction for one another and have no intrinsic volume - they are ______ _____






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






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






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






18. The particular portion of the universe on which we wish to focus our attention. Everything else is called the surroundings.






19. *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.






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






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






22. In an exothermic process - energy is released and ^E of reaction is ________.






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






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






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






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






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






28. Metals have electronegativities less than ____






29. 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.






30. An increase in temperature causes the position of equilibrium of an exothermic reaction to be shifted to the _____ - while that of and endothermic reactions is shifted to the _______.

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31. 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.






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






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






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






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






36. 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).






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. Rays made up of electrons in basic electron charges.






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






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






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






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






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






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






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






46. *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.






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






48. *The electrons found in the outermost shell are called _____ electrons. When these electrons are lost or partially lost through sharing - the oxidation state is assigned a positive value for the element. If valence electrons are gained or partially g






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






50. This is due to the way positive charges of one molecule attract the negative charges of another molecule. Compounds of the solid state that are bound mainly by this type of attractive have soft crystals - are easily deformed - and vaporize easily.