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






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






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






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






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






6. 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.

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7. *The temperature affects chemical reactions with an increase of ___degrees C above room temperature - causing the reaction rate to double.






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






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






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






11. 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.






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






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






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






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






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






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






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






19. **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.






20. 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.






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






22. 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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23. 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.






24. 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.






25. 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.






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






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

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






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






30. 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.






31. Cells that convert electrical energy into chemical energy.






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






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






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






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






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






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






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






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






40. 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.






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






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






43. *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.






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






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






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






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






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






49. 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 _____ _






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