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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. Cells that convert electrical energy into chemical energy.






2. 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.






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






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

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5. *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.






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






7. Because of the low intermolecular forces - the melting points are low and evaporation takes place so easily that it may occur at room temperature.






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






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






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






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






12. 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 _____ _






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






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






15. 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).






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






17. 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.






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

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






20. 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






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






22. Metals have electronegativities less than ____






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






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






25. 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.

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






27. *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.






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






29. Electronegativities _______ as you go down a group.






30. 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.






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. 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.

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33. 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.






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






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






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






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






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






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






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






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






42. 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.

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






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






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






46. The general shape of any molecule can be predicted from the number of bonding and non-bonding electron pairs in the valence shell of the central atom. nonbonded pairs of electrons (lone pairs) are more repellent than bonded pairs.






47. **As we proceed to the right of the table - ______-forming properties decrease and _____-forming properties increase.






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






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






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