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






2. 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






3. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






5. 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






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






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






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






9. 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.






10. A solution in which water is the solvent






11. 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.






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






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






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






15. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






16. 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






17. 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.






18. Small discrete increments of energy.






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






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






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






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






23. 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






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






25. An ionic compound that resists changes in its pH






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






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






28. Two or more atoms held together by covalent bonds






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






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






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






32. Numbers that specify the properties of atomic orbitals and of their electrons






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


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






35. 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






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






37. 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.






38. 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


39. 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






40. 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-






41. 5 valence electrons -3 ions - Nitride N






42. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






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






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






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






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






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






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






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






50. 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