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






2. 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






3. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






4. 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






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






6. 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.






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






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






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






10. 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






11. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






12. 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.






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






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






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






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






17. A horizontal row of elements in the periodic table






18. 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






19. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






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






21. The energy required to break a chemical bond and form neutral isolated atoms






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






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






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






25. 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






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






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






28. 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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


31. 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






32. States that if a stress is applied to a system at equilibrium - the system shifts in the direction that relieves the stress.






33. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.






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






35. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






36. E=hc/?






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






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






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






40. The percent by mass of each element in a compound






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






42. An ionic compound that resists changes in its pH






43. Small discrete increments of energy.






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






45. Mixture of 2 or more substances that distills at a constant temperature and with constant composition - even though seperately the components have different boiling points






46. 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.






47. 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-






48. 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






49. Two or more atoms held together by covalent bonds






50. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water