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






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






3. The average distance between the nuclei of two bonded atoms






4. 5 different orbitals shaped like clover leaves and max electrons is 10






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






6. Simplest whole # ration of atoms in a compound






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






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






9. An atom - radical - or molecule that has gained or lost one or more electrons and has a negative or positive charge






10. 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.






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






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






13. 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.






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






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






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






17. The weak attractive forces between molecules resulting from the small - instantaneous dipoles that occur because of the varying positions of the electrons during their motion about nuclei






18. 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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19. 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






20. The formation of one or more covalent bonds between an electron pair donor and an electron pair acceptor






21. PH of a molecule at which it contains no net electric charge - isoelectric point.






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






23. 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






24. 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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25. 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-






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






27. 5 valence electrons -3 ions - Nitride N






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

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






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






31. 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.






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






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






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






35. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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36. 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.






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






38. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






39. An ionic compound that resists changes in its pH






40. E=hc/?






41. 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.






42. 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.






43. 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






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






45. 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






46. A chemical bond that involves sharing a pair of electrons between atoms in a molecule






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






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






49. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






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







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