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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. 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-






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






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






4. Chalcogens - - Oxide O






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






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






7. PH of a molecule at which it contains no net electric charge - isoelectric point.






8. The process of decomposing a chemical compound by the passage of an electric current.






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






10. 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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11. The percent by mass of each element in a compound






12. The quantum number that has only two possible values - +1/2 and -1/2 - which indicate the two fundamental spin states of an electron in an orbital






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






14. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






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






16. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt






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






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






19. 5 valence electrons -3 ions - Nitride N






20. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






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






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






24. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






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






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






28. 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.






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






30. 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






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






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






33. 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.






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






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






36. 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.






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






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






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






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






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






42. 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






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






44. The area of chemistry that is concerned with reaction rates and reaction mechanisms






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






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






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






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






49. 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






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