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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. 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.






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






3. 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).






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






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






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






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






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






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

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






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






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






13. The process of determining the amount of a solution of known concentration that is required to react completely with a certain amount of a sample that is being analyzed.






14. 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 _____ _






15. 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).






16. This process occurs when the system is thermally isolated so that no heat enters or leaves.






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






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






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






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






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






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






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






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






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






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






27. **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.






28. The particular portion of the universe on which we wish to focus our attention. Everything else is called the surroundings.






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






30. 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.

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






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






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






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






35. 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.






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






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






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






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






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






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






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






43. 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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44. 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






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






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

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






48. *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.






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






50. The degree of randomness of a system is represented by a thermodynamic quantity called? the greater the randomness - the greater the _______.