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






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






3. Product of the molar concentrations of dissociated ions in solution at saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted Ksp.






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






5. Tells you how much solute is present compared to the amount of solvent






6. Sum of the protons and neutrons in an element often denoted by the letter A






7. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






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






9. The molar solubility of one salt is reduced when another salt - having a common ion is brought into the same solution






10. Set of spectral lines appearing in the UV region when a hydrogen atom undergoes a transition from energy levels n>1 to n=1.






11. A naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers






12. The center of the atom which contains the protons and neutrons; in cells - structure that contains the cell's genetic material (DNA) and controls the cell's activities






13. Any sample of a given compound will contain the same elements in the identical mass ratio.






14. The nuclear charge experienced by the outermost electrons of an atom (actual charge minus the shielding caused by inner shells: Z- eff)






15. 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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16. Attractive and repulsive forces between molecules that are weaker than forces within molecules.






17. The amount of energy that reactants must absorb before a chemical reaction will start; also called free energy of activation.






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






19. Structure that occurs when it is possible to draw two or more valid electron dot structures that have the same number of electron pairs for a molecule or ion






20. The tendency for an atom to attract electrons to itself when it is chemically combined with another element






21. An atom - radical - or molecule that has gained or lost one or more electrons and has a negative or positive charge






22. The vapor pressure of solution is the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. P_a=X_aP_total

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






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






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






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






27. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






28. A reaction in which two or more substances combine to form a single substance A+B>>>>>>>C






29. 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






30. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers






31. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






32. Contains nonmetals that are non - reactive. Full outermost energy level except helium which has 2.






33. Numbers that specify the properties of atomic orbitals and of their electrons






34. Keq describes the ratio of product concentration to reactant concentration - with each raised to the power corresponding ot its coefficient ion in the balanced equation






35. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






36. The number of atoms in exactly 12 g of pure 12c and equal to 6.022 x 10^23 is called






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






38. The process by which one or more substances change to produce one or more different substances






39. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






40. Sum of all the masses - in AMU - present in one molecule of a molecular compound.






41. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






42. 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.






43. Nh/2p The angular momentum changes only in discete amounts with respect to the quantum number. Also E=- R_h/n^2






44. E=hc/?






45. A definite stable energy that a physical system can have






46. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T

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47. Expression of auto - ionization of water into H+ and OH- at a certain temperature - given by the product of the ions' molar concentrations. Denoted by Kw and equal to 10-






48. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






49. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






50. The pressure exerted by a vapor in equilibrium with its liquid or solid phase







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