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MCAT Chemistry

Subjects : mcat, science
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 set of spectral lines that appear in the visible light region when a hydrogen atom undergoes a transition from energy levels n>2 to n=2.






2. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






3. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






4. The lowest allowable energy state of an atom






5. (chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers






6. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.






7. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






8. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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9. The ways in which electrons are arranged in various orbitals around the nuclei of atoms






10. The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule






11. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






12. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






13. A dynamic condition in which two opposing changes occur at equal rates in a closed system






14. A pair of equal and opposite electric charges or magnetic poles separated by a small distance






15. A representation of a displacement reaction showing only the reactive species and omitting the spectator ions.






16. Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated






17. The Percent by mass of each element in a compound.






18. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.






19. Systematic pairing of a deprotonated species (base) with its protonated form (conjugate acid). Conjugates appear on opposite sides of a chemical equation.






20. Second quantum number - designated by the letter 'l.' This 'angular momentum' refers to the subshells within each principle quantum energy level. It can take on the value of an integer in the 0 to (n -1) range. The four subshellscorresponding to l=0






21. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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22. Atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas - usually eight valence electrons






23. A chemical reaction involving the transfer of one or more electrons from one reactant to another; also called oxidation - reduction reaction.






24. (chemistry) a substance that changes color to indicate the presence of some ion or substance






25. The slowest elementary step which is the limit for the rate of the other steps






26. The process by which a gas escapes from one container to another at lower pressure through a tiny hole in the container.






27. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight






28. Slightly less reactive than alkali metals - comprise group II






29. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron - and all electrons in singly occupied orbitals must have the same spin

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30. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






31. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






32. A reaction where a compound does Not change its molecular structure.






33. Sol - a chemical process in which solvent molecules and molecules or ions of the solute combine to form a compound






34. The maximum amount of product that can be produced from a given amount of reactant






35. Product of the molar concentrations of dissociated ions in solution at any point in the reaction other than equilibrium or saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted IP.






36. (chemistry) p(otential of) H(ydrogen)






37. The ratio of the actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






38. Gram equivalent weight of solute per liter of solution - often denoted by N.






39. An elementary particle with 0 charge and mass about equal to a proton






40. The amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon -12






41. The quantum number that indicates the main energy level occupied by the electron. Can theoretically take on any positive interger. Denoted by the letter n.






42. The area of chemistry that is concerned with reaction rates and reaction mechanisms






43. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance






44. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






45. The percent by mass of each element in a compound






46. The weight in grams of compound that can be substituted by 1 atom of Hydrogen. GEW = MW / # of acidic Hyrdogens






47. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule

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48. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






49. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance C>>>>A+B






50. Common definition of acids as proton (H+) donors and bases as proton acceptors







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