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






2. Two or more atoms held together by covalent bonds






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






4. 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






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






6. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






7. 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.






8. 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






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






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






11. 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






12. 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






13. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






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






15. Temperature is constant; effusion and temperature are proportional to the square root of their masses


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






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






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






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






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






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






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






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. Named after their cation and anion






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






27. The process of decomposing a chemical compound by the passage of an electric current.






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






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






30. Elements in the middle of the periodic table - in groups 3-12.






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






32. 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






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






34. 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.






35. Sum of the protons and neutrons in an element often denoted by the letter A






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






37. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






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






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






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






41. 5 valence electrons -3 ions - Nitride N






42. 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.






43. 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.






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






45. Simplest whole # ration of atoms in a compound






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






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






48. 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






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






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