Test your basic knowledge |

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






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






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






4. 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.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


5. 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.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






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






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






10. A catalyst lowers the ______ _____ _____ that must be overcome in order for the reaction to proceed. It merely speeds the approach to equilibrium but does not change Keq at all.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






13. 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.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


14. 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.






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. 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.






17. 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.






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






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






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






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






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






23. 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.






24. 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






25. 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.






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






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






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






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






30. 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 _____ _






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






32. Metals have electronegativities less than ____






33. *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.






34. 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).






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






36. **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.






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






38. *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.






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






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






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






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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






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






49. A law stating that at constant pressure - the volume of a given quantity of a gas varies directly with the temperature.






50. 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 _______.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183