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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. Small discrete increments of energy.






2. Named after their cation and anion






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






4. The lowest allowable energy state of an atom






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






6. Redox reaction - in which the same species is both oxidized and reduced.






7. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






8. 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






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






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






11. 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.






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






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






14. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






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






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






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






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






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






20. An ionic compound that resists changes in its pH






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






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






23. 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.






24. The ways in which electrons are arranged in various orbitals around the nuclei of atoms






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






26. One - half of the distance between the center of identical atoms that are not bonded together. Since effective nuclear charge increases when moving from left to right each additional electron is pulled more strogly toward the nucleus.






27. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight






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






29. Chalcogens - - Oxide O






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






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






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






34. In a solution - the substance that dissolves in the solvent






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






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






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






38. The nuclear charge experienced by the outermost electrons of an atom (actual charge minus the shielding caused by inner shells: Z- eff)






39. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






40. 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






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






42. 2.18 x 10^-18 J/electron






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






44. 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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45. Substance in which a solute is dissolved to form a solution






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






47. 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.






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






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






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







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