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






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






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






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






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






6. 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






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






8. 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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9. The energy required to break a chemical bond and form neutral isolated atoms






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






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






12. A set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors






13. 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.






14. Have three valance electrons. In certain instances - some elements will loose three electrons - but they will also share electrons with another element to attain stability.






15. A substance that - when dissolved in water - results in a solution that can conduct electricity






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






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






18. An element in an 'A' group in the periodic table; as a group these elements display a wide range of physical and chemical properties. In their atoms - the s and p sublevels in the highest occupied energy level are partially filled






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






20. 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






21. 2.18 x 10^-18 J/electron






22. 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.






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






24. The energy required to remove an electron from a gaseous atom; generally increases in moving from left - to - right across a period and decreases in moving down a group






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






26. Elements in the middle of the periodic table - in groups 3-12.






27. Chalcogens - - Oxide O






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






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






31. 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






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






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






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






36. E=hc/?






37. A base that can accept two moles of H+ per mole of itself (ex: SO4






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






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






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






41. A subatomic particle that has a positive charge and that is found in the nucleus of an atom Charge of +1 and mass of 1.0073 amu






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






43. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






44. A horizontal row of elements in the periodic table






45. Named after their cation and anion






46. 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






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






48. 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.






49. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






50. Small discrete increments of energy.






Can you answer 50 questions in 15 minutes?



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