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






2. 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






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






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






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






6. 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.






7. 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.






8. 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






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






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






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






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






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






14. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






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






17. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule


18. 2.18 x 10^-18 J/electron






19. 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


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






21. 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






22. 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.






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






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






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






26. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.






27. An atom or group of atoms that has a positive or negative charge






28. Nh/2p The angular momentum changes only in discete amounts with respect to the quantum number. Also E=- R_h/n^2






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






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






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






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






33. A horizontal row of elements in the periodic table






34. Simplest whole # ration of atoms in a compound






35. A solid made up of particles that are not arranged in a regular pattern.






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






37. A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion






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






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






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






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






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






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






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






45. A dynamic condition in which two opposing changes occur at equal rates in a closed system






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






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






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






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