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






2. 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.






3. 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






4. 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.






5. 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.






6. 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.






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






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






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






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






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






12. 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






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






14. The energy required to remove an electron from a gaseous atom; generally increases in moving from left - to - right across a period and decreases in moving down a group






15. 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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16. Slightly less reactive than alkali metals - comprise group II






17. 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






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






19. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.






20. Common definition of acids as proton (H+) donors and bases as proton acceptors






21. The lowest allowable energy state of an atom






22. A covalent bond in which the bonding electrons are shared equally by the bonded atoms - resulting in a balanced distribution of electrical charge






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






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






25. 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






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






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






28. 5 valence electrons -3 ions - Nitride N






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






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






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






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






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






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






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






36. Named after their cation and anion






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






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






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






40. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






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






42. 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






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






44. 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.






45. The energy required to break a chemical bond and form neutral isolated atoms






46. Chalcogens - - Oxide O






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






48. The molar solubility of one salt is reduced when another salt - having a common ion is brought into the same solution






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






50. A definite stable energy that a physical system can have