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






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






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






5. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






6. 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.






7. Have three valance electrons. In certain instances - some elements will loose three electrons - but they will also share electrons with another element to attain stability.






8. 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-






9. 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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10. Sol - a chemical process in which solvent molecules and molecules or ions of the solute combine to form a compound






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






12. 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






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






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






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






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






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






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






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






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






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






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






23. 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






24. A subatomic particle that has a positive charge and that is found in the nucleus of an atom Charge of +1 and mass of 1.0073 amu






25. 5 valence electrons -3 ions - Nitride N






26. The weak attractive forces between molecules resulting from the small - instantaneous dipoles that occur because of the varying positions of the electrons during their motion about nuclei






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






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






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






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






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






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






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






34. 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.






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






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






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






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






39. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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40. An equilibrium expression used to measure weak - acid strength - given by the ratio of the product of the products' molar concentrations to the product of the reactants' molar concentrations - with each term raised to the power of its stoichiometric






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






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






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






44. Simplest whole # ration of atoms in a compound






45. 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






46. 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.






47. The lowest allowable energy state of an atom






48. The center of the atom which contains the protons and neutrons; in cells - structure that contains the cell's genetic material (DNA) and controls the cell's activities






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






50. 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