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






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






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






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






5. 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.






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






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






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






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






10. 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






11. 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 _____ _






12. Metals have electronegativities less than ____






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






14. 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.


15. For most substances - when a hot concentrated solution is cooled - the excess solid ________. This is useful in purification of the solute.






16. The vapor pressure increases with increasing _____.






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






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






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






20. 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.






21. In an endothermic process - energy is absorbed and ^E is _______.






22. A law stating that at constant pressure - the volume of a given quantity of a gas varies directly with the temperature.






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






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






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






26. 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.


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






28. 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.


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


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






31. A pure crystal of elemental metal consists of roughly Avogrado's number of atoms held together by ________ bonds.






32. Cells that convert electrical energy into chemical energy.






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


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






35. *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.






36. 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






37. *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.






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






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






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






41. 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.






42. 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.






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






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






45. *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






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






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






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






49. 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.






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