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






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






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






4. The maximum amount of product that can be produced from a given amount of reactant






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






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. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






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






9. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






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






11. 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






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






13. 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






14. 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






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






16. Attractive and repulsive forces between molecules that are weaker than forces within molecules.






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






18. The ways in which electrons are arranged in various orbitals around the nuclei of atoms






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






20. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron - and all electrons in singly occupied orbitals must have the same spin

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






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






23. Chalcogens - - Oxide O






24. Sum of the protons and neutrons in an element often denoted by the letter A






25. 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






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






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






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






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






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






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






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






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






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






35. Simplest whole # ration of atoms in a compound






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






37. An element in an 'A' group in the periodic table; as a group these elements display a wide range of physical and chemical properties. In their atoms - the s and p sublevels in the highest occupied energy level are partially filled






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






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






40. 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






41. 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.






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






43. Two or more atoms held together by covalent bonds






44. A bond formed when two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei






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






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






47. The process by which one or more substances change to produce one or more different substances






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






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






50. 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