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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. A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion






2. 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.






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






5. 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






6. An acid that will completely dissociate in aqueous solution - like HCl - HI - HClO4 HBr.






7. Tells you how much solute is present compared to the amount of solvent






8. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






9. A definite stable energy that a physical system can have






10. The molar amount of a solute that can dissolve in 1L of solvent until equilibrium - saturation - is reached






11. The maximum amount of product that can be produced from a given amount of reactant






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






13. A horizontal row of elements in the periodic table






14. 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






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






16. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






17. 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-






18. A representation of a displacement reaction showing only the reactive species and omitting the spectator ions.






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






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






21. 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






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






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






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






25. 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.






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






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






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






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






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






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






32. 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






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






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






35. 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.






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






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






38. 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






39. (chemistry) p(otential of) H(ydrogen)






40. The tendency for an atom to attract electrons to itself when it is chemically combined with another element






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






42. A set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors






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






44. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






45. 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.






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






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






48. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






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






50. 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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