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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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) a substance that changes color to indicate the presence of some ion or substance






2. 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






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






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






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






7. A set of spectral lines that appear in the visible light region when a hydrogen atom undergoes a transition from energy levels n>2 to n=2.






8. 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.






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






10. 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






11. A set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors






12. One - half of the distance between the center of identical atoms that are not bonded together. Since effective nuclear charge increases when moving from left to right each additional electron is pulled more strogly toward the nucleus.






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






14. 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






15. Acids defined as electron - pair acceptors and bases as electron - pair donors.






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






17. 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.






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






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






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






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






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

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






24. 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






25. 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.






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






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






28. 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






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






30. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers






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






32. 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






33. The number of atoms in exactly 12 g of pure 12c and equal to 6.022 x 10^23 is called






34. 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.






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






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






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






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






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






40. The vapor pressure of solution is the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. P_a=X_aP_total

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






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






43. 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-






44. The amount of energy that reactants must absorb before a chemical reaction will start; also called free energy of activation.






45. 2.18 x 10^-18 J/electron






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






47. 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






48. 5 valence electrons -3 ions - Nitride N






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






50. A naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers