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






2. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






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






4. An element in an 'A' group in the periodic table; as a group these elements display a wide range of physical and chemical properties. In their atoms - the s and p sublevels in the highest occupied energy level are partially filled






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






6. Sum of all the masses - in AMU - present in one molecule of a molecular compound.






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






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






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






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






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






12. The process by which a gas escapes from one container to another at lower pressure through a tiny hole in the container.






13. The lowest allowable energy state of an atom






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






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






16. A solution in which water is the solvent






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






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






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






20. 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.






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






22. 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






23. 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






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






25. 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-






26. Simplest whole # ration of atoms in a compound






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






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






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






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






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






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. A pair of equal and opposite electric charges or magnetic poles separated by a small distance






34. 5 different orbitals shaped like clover leaves and max electrons is 10






35. 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






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






37. 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






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






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






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






41. 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.






42. Rare earth element group (elements 58-71)






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






44. 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.






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






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






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






49. A substance that - when dissolved in water - results in a solution that can conduct electricity






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