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






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






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






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






6. 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.






7. 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.

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






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






10. 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






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






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






13. 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.






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






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






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






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






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






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






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






21. 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).






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






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






24. 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.






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






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

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27. Reactions that do not occur spontaneously can be forced to take place by supplying energy with an external current.






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






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






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






31. 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.






32. Cells that convert electrical energy into chemical energy.






33. **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.






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






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






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






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

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






40. *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.






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






42. 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 _____ _






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






44. 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.






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






46. Metals have electronegativities less than ____






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






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






49. 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.






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