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






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






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






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






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






6. 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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7. 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.






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






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






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






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






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






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






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






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






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






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






18. 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.






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






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






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






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

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






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






26. Gases are composed of tiny - invisible molecules that are widely separated from one another in otherwise empty space.






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






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






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






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. Electronegativities _______ as you go down a group.






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






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






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






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






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






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






38. A valence theory that permits the geometric arrangement of atoms - or groups of atoms - about some central atom to be determined solely by considering the repulsions between the electron pairs present in the valence shell of the central atom.






39. The vapor pressure increases with increasing _____.






40. 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.






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






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






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






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






45. Cells that convert electrical energy into chemical energy.






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






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






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






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






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