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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. Simplest whole # ration of atoms in a compound






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






3. 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.






4. Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated






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






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






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






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






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






10. 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






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






12. A horizontal row of elements in the periodic table






13. 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






14. 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-






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






16. 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






17. 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






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






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






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






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






23. 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






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






25. 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






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






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






28. Product of the molar concentrations of dissociated ions in solution at saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted Ksp.






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






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






31. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






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. 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.






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






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






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






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






38. The lowest allowable energy state of an atom






39. 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.






40. 5 valence electrons -3 ions - Nitride N






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






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






43. 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






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






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






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






47. 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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48. 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.






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






50. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds