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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 one substance is displacing another. ex: Fe + CuSo4 -> FeSo4 + Cu.






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






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






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






6. 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).






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






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






9. When a hydrogen atom is bonded to a highly electronegative atom - it will become partially _____-charged - and will be attracted to neighboring electron pairs. This creates a hydrogen bond. The more polar the molecule - the more effective the hydroge






10. Metals have electronegativities less than ____






11. An increase in temperature causes the position of equilibrium of an exothermic reaction to be shifted to the _____ - while that of and endothermic reactions is shifted to the _______.


12. *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.






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






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






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






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






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






18. 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.






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






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






21. **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.






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






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






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






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






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






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






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






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






30. The freezing point - boiling point - and vapor pressure of a solution differ from those of the pure solvent by amounts which are directly proportional to the molal concentration of the solute.






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






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






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






34. 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).






35. 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






36. 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.


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






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






39. 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






40. 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.


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






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


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






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






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






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






47. 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 _____ _






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






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






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