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






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






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






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






5. 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






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






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






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






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






10. The point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another






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






12. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






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






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






16. 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






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






18. 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






19. 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-






20. Two or more atoms held together by covalent bonds






21. The lowest allowable energy state of an atom






22. Where half of the acid is neutralized by the base on a titration curveAn acid dissociation constant - Ka - (also known as acidity constant - or acid - ionization constant) is a quantitative measure of the strength of an acid in solution. It is the eq






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






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






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






26. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






27. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






28. 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






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. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight






31. A solution in which water is the solvent






32. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






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






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






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






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






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






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






40. 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.






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






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






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






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






45. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






46. 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.






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






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






49. 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.






50. 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






Can you answer 50 questions in 15 minutes?



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