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






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






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






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






5. 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






6. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






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






8. Substance in which a solute is dissolved to form a solution






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






10. 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






11. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers






12. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Abbreviated as Z(eff). Increases from left to right - and bottom to top on the Periodic Table.






13. Acids defined as electron - pair acceptors and bases as electron - pair donors.






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






15. 2.18 x 10^-18 J/electron






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






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






18. 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






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






20. 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






21. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






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






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. Slightly less reactive than alkali metals - comprise group II






26. 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.






27. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






28. Second quantum number - designated by the letter 'l.' This 'angular momentum' refers to the subshells within each principle quantum energy level. It can take on the value of an integer in the 0 to (n -1) range. The four subshellscorresponding to l=0






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






30. Any sample of a given compound will contain the same elements in the identical mass ratio.






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






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






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






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






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






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






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






38. Two or more atoms held together by covalent bonds






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






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






41. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






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






43. 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






44. 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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45. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T

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46. The lowest allowable energy state of an atom






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






48. 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.






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






50. 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.