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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 pair of equal and opposite electric charges or magnetic poles separated by a small distance






2. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






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






4. 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






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






7. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






8. An ionic compound that resists changes in its pH






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






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






11. 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.






12. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






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






14. PH=pka+log[base/acid] Used in titration based problems that relates the pH or pOH of a solution to the pK and the ratio of the dissociated species.






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






16. 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






17. 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.






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






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






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






22. Named after their cation and anion






23. 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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24. 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






25. 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.






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






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






28. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






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






30. The process by which one or more substances change to produce one or more different substances






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






32. A chemical formula showing the ratio of elements in a compound rather than the total number of atoms






33. The number of atoms in exactly 12 g of pure 12c and equal to 6.022 x 10^23 is called






34. Valence Shell Electron Pair Repulsion theory - stating that the three - dimensional molecular geometry about some central atom is determined by the elctronic repulsion between its bonding and nonbonding electron pairs.






35. Substance in which a solute is dissolved to form a solution






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






37. A base that can accept two moles of H+ per mole of itself (ex: SO4






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






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






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






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






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






43. 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






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






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






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






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






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






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






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