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






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






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






4. 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.






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






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






8. 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.






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






10. Cells that convert electrical energy into chemical energy.






11. When a system at equilibrium is disturbed by adding or removing one of hte substances - all the concentrations will change until a new equilibrium point is reached with the same value of Keq.

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






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






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






15. For a cell at concentrations and conditions other than standard - a potential can be calculated using this equation.






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






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






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






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






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






22. Deviations from Boyles law that occur with real gases represent _______ behavior.






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






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

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26. For a ________ reaction - the energy liberated in the exothermic reaction equals the energy absorbed in the endothermic reaction.






27. 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.






28. 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.






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






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






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






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






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

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35. The change in enthalpy of an exothermic reaction is ________.






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






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






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






39. 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.






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






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






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






45. The temperature at which the pressure of vapor escaping from the liquid equals atmospheric pressure.






46. Electronegativities _______ as you go down a group.






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






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






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






50. Rays made up of positive electrodes in basic electron charges.