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






2. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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3. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






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






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






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






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






8. The lowest allowable energy state of an atom






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






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






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






12. Theory stating that the rate of a reaction is directly proportional to the number of collisions that take place between reactants per second.






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






14. Systematic pairing of a deprotonated species (base) with its protonated form (conjugate acid). Conjugates appear on opposite sides of a chemical equation.






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






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






17. Small discrete increments of energy.






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






19. 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






20. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






21. The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule






22. 5 different orbitals shaped like clover leaves and max electrons is 10






23. An ionic compound that resists changes in its pH






24. 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






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






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






27. 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.






28. 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






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






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






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






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






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






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






35. 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.






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






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






38. 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.






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






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






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

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






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






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






45. 2.18 x 10^-18 J/electron






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






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






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






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






50. 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