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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. 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






2. Simplest whole # ration of atoms in a compound






3. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






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






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






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






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






8. 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.






9. The ratio of the actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






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






11. 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






12. A solution in which water is the solvent






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






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






16. Two or more atoms held together by covalent bonds






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


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






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






20. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






21. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






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






23. 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.






24. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance






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






26. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






27. A concentration unit of a solution expressed as moles of solute dissolved per liter of solution






28. The amount of energy that reactants must absorb before a chemical reaction will start; also called free energy of activation.






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






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


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






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






33. 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






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






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






36. 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.






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






38. 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






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






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






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






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






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






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






45. An elementary particle with 0 charge and mass about equal to a proton






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






47. A horizontal row of elements in the periodic table






48. 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






49. 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


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