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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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 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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2. Chalcogens - - Oxide O






3. 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.






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






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






6. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






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






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






9. 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






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






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






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






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






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






15. 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






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






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






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






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

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






21. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






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






24. Named after their cation and anion






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






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






27. 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.






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






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. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






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






32. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






33. The quantum number that indicates the main energy level occupied by the electron. Can theoretically take on any positive interger. Denoted by the letter n.






34. 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






35. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






36. 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.






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






38. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers






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






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






41. Small discrete increments of energy.






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






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






44. 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






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






46. A measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete






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






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






49. Two or more atoms held together by covalent bonds






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