Test your basic knowledge |

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






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






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






4. *The Concentration usually _____ the chemical reaction rate with increasing concentrations of the reactants.






5. 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).






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






10. If this law was strictly obeyed - gases would not condense when they are cooled. This means that gases behave in an ideal fashion only at relatively high temperatures and low pressures.






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






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






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






14. Metals have electronegativities less than ____






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. 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.






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






18. 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.






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






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






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






22. A hypothetical gas would follow Boyles law under all conditions and is called?






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






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.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


25. 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.






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






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






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






29. 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.






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






31. 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.






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






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






34. 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.






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






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






38. 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 _____ _






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






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






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






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






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






44. 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.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






47. *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.






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






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






50. 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.