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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 percent by mass of each element in a compound






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






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






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






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






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






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






9. An ionic compound that resists changes in its pH






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






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

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12. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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13. Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated






14. A bond formed when two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei






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






16. 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-






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






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. 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.






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






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






22. 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.






23. A dynamic condition in which two opposing changes occur at equal rates in a closed system






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






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






26. 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.






27. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt






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

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29. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






30. 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






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






32. The weight in grams of compound that can be substituted by 1 atom of Hydrogen. GEW = MW / # of acidic Hyrdogens






33. 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






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






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






36. 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






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






38. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






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






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






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






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

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






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






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






46. Set of spectral lines appearing in the UV region when a hydrogen atom undergoes a transition from energy levels n>1 to n=1.






47. 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.






48. Contains nonmetals that are non - reactive. Full outermost energy level except helium which has 2.






49. 2.18 x 10^-18 J/electron






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