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






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






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






4. Named after their cation and anion






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






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






7. 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






8. 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.






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






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






11. 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.






12. A chemical formula showing the ratio of elements in a compound rather than the total number of atoms






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






14. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






15. 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






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






18. The slowest elementary step which is the limit for the rate of the other steps






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






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






22. The formation of one or more covalent bonds between an electron pair donor and an electron pair acceptor






23. A physical property of a solution that depends on the number - but not the identity - of the disswolved solute particles; example properties include vapor pressure lowering - boiling point elevation - osmotic pressure - and frezzing point depression






24. Contains nonmetals that are non - reactive. Full outermost energy level except helium which has 2.






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






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






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






28. An acid that will completely dissociate in aqueous solution - like HCl - HI - HClO4 HBr.






29. 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.






30. 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.






31. Spectrum of certain absorbed wavelengths of light corresponding to an atom's spectrum of emitted frequencies of light. Unique to each element. AAS can be used to indentify an element.






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






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






34. The sum of the exponents in a rate law - where each exponent provides the reaction order with respect to its reactants






35. 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






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






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






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






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






40. 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






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






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






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






44. A base that can accept two moles of H+ per mole of itself (ex: SO4






45. The amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon -12






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






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






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






49. 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






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