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

2. Rays made up of electrons in basic electron charges.

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

4. Metals have electronegativities less than ____

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

6. 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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

21. 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 _____ _

22. 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.

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

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

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

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

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

28. **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.

29. The average kinetic energy of all the molecules collectively is directly proportional to the absolute temperature of the gas. The average kinetic energy of equal numbers of molecules of any gas is the same at the same temperature.

30. 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

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

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

33. 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.

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

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

36. 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.

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. 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

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

40. 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.

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

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

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

44. 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.

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

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

47. *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.

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

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

50. 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.