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






3. 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.






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






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






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






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

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






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






11. The solubility of gases in liquid or solid solvents always increases with ________ pressure.






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






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






14. _____ bonds are present in molecules containing double or triple bonds.






15. 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.






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






17. 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 _____ _






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






19. A principle stating that when a system at equilibrium is disturbed by the application of a stress (change in temperature - pressure - or concentration) it reacts to minimize the stress and attain a new equilibrium position.

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20. The energy required to remove an electron from an isolated atom in its ground state.






21. A pure crystal of elemental metal consists of roughly Avogrado's number of atoms held together by ________ bonds.






22. A law stating that the vapor pressure of a solution at a particular temperature is equal to teh mole fraction of the solvent in the liquid phase multiplied by the vapor pressure of the pure solvent at the same temperature.






23. 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).






24. 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).






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






26. Electronegativities _______ as you go down a group.






27. A chemical reaction where one substance is displacing another. ex: Fe + CuSo4 -> FeSo4 + Cu.






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






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






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






31. 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.






32. The amount of heat energy required to raise the temperature 1g of a substance by 1 degree celcius.






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






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






35. This process occurs when the system is maintained at the same temperature throughout an experiment.






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






37. The process of determining the amount of a solution of known concentration that is required to react completely with a certain amount of a sample that is being analyzed.






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






39. **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.






40. 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.

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






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






43. The enthalpy changes associated with the reactions that correspond to the formation of a substance from its free elements are called?






44. 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.






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






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






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






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






49. 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.






50. _______ has very little effect on the solubility of liquids or solids in liquid solvents.






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