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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 action of salts of weak acids or bases with water to form acidic or basic solutions.






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






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






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






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






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






7. 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).






8. 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.






9. 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.


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






11. Cells that convert electrical energy into chemical energy.






12. 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.






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






14. Electronegativities _______ as you go down a group.






15. 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.






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






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






18. If an inert gas is introduced into a reaction vessel containing other gases at equilibrium - it will cause an increase in the ______ _____ within the container - but the increase will not affect the position of equilibrium.


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






20. **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.






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






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






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






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






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






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






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






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






29. Metals have electronegativities less than ____






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






31. 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 _______.


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






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






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






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






36. *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.






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






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






39. A valence theory that permits the geometric arrangement of atoms - or groups of atoms - about some central atom to be determined solely by considering the repulsions between the electron pairs present in the valence shell of the central atom.






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






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


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






43. 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






44. A chemical reaction formed from the breakdown of a compound into its individual elements or compounds.






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






46. The maximum work derived from any change will be obtained only if the process is carried out in a reversible manner. All real - spontaneous changes are therefore not reversible - and the work that can be derived from an irreversible change is alway l






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






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






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






50. 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.