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CLEP Chemistry 1

Subjects : clep, science, chemistry
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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 molecules in a gas collide with one another - but the collisions are perfectly elastic (they result in no net loss of energy).

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

3. 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.

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

5. The _____ speed up the rate of a chemical reaction but do not change the equilibrium constant - it simply speeds up the rate of approach to equilibrium.

6. The most active nonmetals are found in what corner of the periodic table?

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

8. Electronegativities _______ as you go down a group.

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

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

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

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

13. *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.

14. 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.

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

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

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

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

19. 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.

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

21. 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.

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

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

24. *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

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

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

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

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

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

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

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

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

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

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

35. 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).

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

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

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

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

40. 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.

41. Metals have electronegativities less than ____

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

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

44. *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.

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

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

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

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

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

50. 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).