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






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






3. 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.






4. 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






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






6. 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.






7. E=hc/?






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






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






10. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






11. 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






12. 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






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






14. 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.






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






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






17. 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






18. Small discrete increments of energy.






19. The point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another






20. 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






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






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






23. 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






24. 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






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


26. 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.






27. Where half of the acid is neutralized by the base on a titration curveAn acid dissociation constant - Ka - (also known as acidity constant - or acid - ionization constant) is a quantitative measure of the strength of an acid in solution. It is the eq






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






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






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






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






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






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






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






35. The number of atoms in exactly 12 g of pure 12c and equal to 6.022 x 10^23 is called






36. A subdivision of an energy level in an atom. They are divided into orbitals.






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






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


39. Named after their cation and anion






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






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






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






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






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






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






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






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






48. 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






49. Two or more atoms held together by covalent bonds






50. 5 different orbitals shaped like clover leaves and max electrons is 10