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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.
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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. 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






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






3. 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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4. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






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






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






8. Acids defined as electron - pair acceptors and bases as electron - pair donors.






9. 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.






10. 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-






11. 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.






12. Named after their cation and anion






13. The process of decomposing a chemical compound by the passage of an electric current.






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






15. 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






16. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water






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






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






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






20. Attractions between molecules caused by the electron motion on one molecule affecting the electron motion on the other through electrical forces; these are the weakest interactions between molecules






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






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






23. E=hc/?






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






25. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






26. Mixture of 2 or more substances that distills at a constant temperature and with constant composition - even though seperately the components have different boiling points






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






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






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






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






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






32. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






33. 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.






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






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






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






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






38. 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.






39. PH=pka+log[base/acid] Used in titration based problems that relates the pH or pOH of a solution to the pK and the ratio of the dissociated species.






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






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






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






43. Small discrete increments of energy.






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






45. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






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






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






48. 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






49. A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion






50. An acid that will completely dissociate in aqueous solution - like HCl - HI - HClO4 HBr.







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