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






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






3. Atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas - usually eight valence electrons






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






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






6. 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.






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






8. The Percent by mass of each element in a compound.






9. 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






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






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






12. The lowest allowable energy state of an atom






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






14. 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






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






16. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.






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






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






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






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






21. A solution in which water is the solvent






22. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






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






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






25. Valence Shell Electron Pair Repulsion theory - stating that the three - dimensional molecular geometry about some central atom is determined by the elctronic repulsion between its bonding and nonbonding electron pairs.






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






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






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






29. An ionic compound that resists changes in its pH






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






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






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






33. 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.






34. 5 different orbitals shaped like clover leaves and max electrons is 10






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






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






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






38. 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






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






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






41. An atom - radical - or molecule that has gained or lost one or more electrons and has a negative or positive charge






42. 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






43. 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






44. 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.






45. 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






46. 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






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






48. 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






49. Have three valance electrons. In certain instances - some elements will loose three electrons - but they will also share electrons with another element to attain stability.






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