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






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






3. 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.






4. The percent by mass of each element in a compound






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






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






7. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






8. 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






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






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






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






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






13. Substance in which a solute is dissolved to form a solution






14. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






15. 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-






16. 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






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






18. 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.






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






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






21. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






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






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






24. Simplest whole # ration of atoms in a compound






25. States that if a stress is applied to a system at equilibrium - the system shifts in the direction that relieves the stress.






26. Rare earth element group (elements 58-71)






27. 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.






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






29. An ionic compound that resists changes in its pH






30. 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






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






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


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






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






35. The lowest allowable energy state of an atom






36. The ratio of the actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






37. 2.18 x 10^-18 J/electron






38. 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.






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






40. 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






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






42. Theory stating that the rate of a reaction is directly proportional to the number of collisions that take place between reactants per second.






43. 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.






44. Common definition of acids as proton (H+) donors and bases as proton acceptors






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






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






47. 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






48. Systematic pairing of a deprotonated species (base) with its protonated form (conjugate acid). Conjugates appear on opposite sides of a chemical equation.






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






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