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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. 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






2. 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.






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






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






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






6. 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






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






8. 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.






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






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






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






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






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






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. A definite stable energy that a physical system can have






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






17. An ionic compound that resists changes in its pH






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






19. A physical property of a solution that depends on the number - but not the identity - of the disswolved solute particles; example properties include vapor pressure lowering - boiling point elevation - osmotic pressure - and frezzing point depression






20. 2.18 x 10^-18 J/electron






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






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






23. 5 valence electrons -3 ions - Nitride N






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






25. A solution in which water is the solvent






26. Spectrum of certain absorbed wavelengths of light corresponding to an atom's spectrum of emitted frequencies of light. Unique to each element. AAS can be used to indentify an element.






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






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






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






30. 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.






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






32. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






33. An atom or group of atoms that has a positive or negative charge






34. 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-






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






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






37. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






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






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






41. 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






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






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


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






46. 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






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






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






49. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






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