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






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






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


4. 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






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






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






7. 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.






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






9. **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.






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






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






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






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






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






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






16. 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.






17. 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






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






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






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






21. 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 _____ _






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






23. 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.


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






25. 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.


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






27. Cells that convert electrical energy into chemical energy.






28. 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.






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






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






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






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






33. The law stating that in any spontaneous process there is an increase in the entropy of the universe.






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






35. 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.






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






37. The temperature at which a substance's solid and liquid phases are in equilibrium.






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






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






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






41. 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).






42. *Each wave function corresponds to a certain electron energy and describes a region about the nucleus (orbital) where an electron having that energy may be found.






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






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






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






46. 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.






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






48. 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.


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






50. 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.