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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






2. An ionic compound that resists changes in its pH






3. A reaction in which atoms of one element take the place of atoms of another element in a compound






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






5. 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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6. The average distance between the nuclei of two bonded atoms






7. A solid made up of particles that are not arranged in a regular pattern.






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






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






10. Property of the elements that can be predicted from the arrangement of the periodic table






11. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






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

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13. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






14. 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






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






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






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






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






19. 2.18 x 10^-18 J/electron






20. 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






21. An equilibrium expression used to measure weak - acid strength - given by the ratio of the product of the products' molar concentrations to the product of the reactants' molar concentrations - with each term raised to the power of its stoichiometric






22. Valence Shell Electron Pair Repulsion theory - stating that the three - dimensional molecular geometry about some central atom is determined by the elctronic repulsion between its bonding and nonbonding electron pairs.






23. Two or more atoms held together by covalent bonds






24. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






25. A concentration unit of a solution expressed as moles of solute dissolved per liter of solution






26. 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






27. Have the shape of a sphere - with the center of the sphere at the nucleus; completely symmetrical along all axes; 1s orbital is spherically symmetric and has no nodes; 2s orbital is also spherical but contains a node and is higher in energy






28. The formation of one or more covalent bonds between an electron pair donor and an electron pair acceptor






29. Having characteristics of both an acid and a base and capable of reacting as either






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






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






32. In a solution - the substance that dissolves in the solvent






33. 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-






34. 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.






35. A solution in which water is the solvent






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






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






38. The sum of the exponents in a rate law - where each exponent provides the reaction order with respect to its reactants






39. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt






40. Redox reaction - in which the same species is both oxidized and reduced.






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






42. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






43. One - half of the distance between the center of identical atoms that are not bonded together. Since effective nuclear charge increases when moving from left to right each additional electron is pulled more strogly toward the nucleus.






44. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Abbreviated as Z(eff). Increases from left to right - and bottom to top on the Periodic Table.






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






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






47. The quantum number that has only two possible values - +1/2 and -1/2 - which indicate the two fundamental spin states of an electron in an orbital






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






49. A chemical formula showing the ratio of elements in a compound rather than the total number of atoms






50. 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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