Test your basic knowledge |

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. (chemistry) p(otential of) H(ydrogen)






2. 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-






3. 2.18 x 10^-18 J/electron






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






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






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






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






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






9. A definite stable energy that a physical system can have






10. 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.






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






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






13. A solution in which water is the solvent






14. 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






15. 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






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






17. 5 different orbitals shaped like clover leaves and max electrons is 10






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






19. 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.






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






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






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






23. Small discrete increments of energy.






24. 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






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






26. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid


27. 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






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






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






30. A measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete






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






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






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






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






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






36. 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.






37. 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.






38. 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






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


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






41. The molar amount of a solute that can dissolve in 1L of solvent until equilibrium - saturation - is reached






42. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






43. 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.






44. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule


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






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






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






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






49. Two or more atoms held together by covalent bonds






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