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. 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






2. Having characteristics of both an acid and a base and capable of reacting as either






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






4. The lowest allowable energy state of an atom






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






6. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






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






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






9. Two or more atoms held together by covalent bonds






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






11. 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.






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






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






14. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






15. 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






16. 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






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






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






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






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






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






22. Chalcogens - - Oxide O






23. A horizontal row of elements in the periodic table






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






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






26. A concentration unit of a solution expressed as moles of solute dissolved per liter of solution






27. An ionic compound that resists changes in its pH






28. 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






29. Structure that occurs when it is possible to draw two or more valid electron dot structures that have the same number of electron pairs for a molecule or ion






30. 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.






31. 5 valence electrons -3 ions - Nitride N






32. Set of spectral lines appearing in the UV region when a hydrogen atom undergoes a transition from energy levels n>1 to n=1.






33. The formation of one or more covalent bonds between an electron pair donor and an electron pair acceptor






34. The area of chemistry that is concerned with reaction rates and reaction mechanisms






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






36. The maximum amount of product that can be produced from a given amount of reactant






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






38. 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






39. 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.






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






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






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






43. 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.






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






45. Attractions between molecules caused by the electron motion on one molecule affecting the electron motion on the other through electrical forces; these are the weakest interactions between molecules






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






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






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






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